Windows vs Unix/Linux culture

Article: Hot Chips XXI Preview
By: JasonB (no.delete@this.spam.com), August 25, 2009 10:48 pm
Room: Moderated Discussions
Richard Cownie (tich@pobox.com) on 8/25/09 wrote:
---------------------------
>JasonB (no@spam.com) on 8/25/09 wrote:
>---------------------------
>
>>As I've said before:
>>
>>1. That cost will be present in the parallel processing case as well,
>
>Sure. But you're talking about the difference between
>the two cases being 1000x. And I'm saying it's probably
>more like 10x or 20x. Because the data has to move around
>in both cases. It probably has to move several extra
>times in my approach. And if the difference turns out to
>be 50x, then I'll need 500uS granules instead of your 10uS
>granules. And that would be just fine for what I'm
>doing (though smaller/quicker is better, obviously).

To clarify the point I'm making, and give some hard numbers, I added in some fake copying before and after a particular routine to simulate transferring data back and forth to different processes.

I chose the routine in question because it was easiest to test with. The output is clearly partitioned -- the multithreaded routine simply allocates a range in the output array to each thread and they can safely dump values into their range without having to worry about interfering with the other threads. The input is less clearly partitioned -- it, too, consists of an array, each element of which (apart from some boundary cases) will only ever be read by a single thread, however some work would be required up-front to work out where those boundaries actually lie.

I didn't do that. I didn't even bother physically sending the data into a different process's memory space or anything like that -- I just allocated memory for each thread, copied the input data into the array with a straight memcpy(), and copied the output data back out of each array afterwards the same way. (No attempt at serialisation or anything like that, just memcpy().)

I tested it with copying all data into each input array beforehand (to simulate the case where you don't know in advance what data is required) as well as a fraction of the data into each input array beforehand (to simulate the case where you know exactly in advance what data is required, and there is no overlap between processes in terms of required data). I ignored other (much smaller) data that is also required by each thread in order to do the computation.

The result was a 14% overhead in the case where 1/4 of the input data was copied for each of the four threads, to 35% overhead in the case where all of the input data was copied into each thread. (So, in terms of space, twice as much physical memory required for the best case and four times as much for the worst case.)

That equates to nearly 3.5 hours in your 24 hour runtime in the perfect case, and nearly 8.4 hours in your 24 hour runtime in the "worst" case. (Not really worse because in reality I was still just copying data around in the same process's memory space, with no communication or synchronisation overheads.)

Of course other operations will have different percentage overheads, but I'm not going to do the work necessary to actually sort it out for a test for exactly the same reason why I'm not going to do the work necessary to use multiprocessing rather than multithreading. This particular case is also unfair both ways -- firstly, it is unfair to your argument because it just happens to have a relatively high rate of data consumption, meaning the processing time per byte copied is lower than average and makes the intial and final copy seem like a bigger deal. But it is also unfair to my argument as well, in that not only did I ignore all overheads other than the actual copy itself, I also chose an operation that just happens to consume all of the input data. There are plenty of other operations that do more work per byte, but most of them don't read all of the input data nor allow you to predict which subset of the input data needs to be copied, so their "work per copied byte" could be either higher or lower.

So ignoring the unfairness of this particular case and all the real-life overheads that are being ignored, does it need to be 1000X faster (i.e. about 20 seconds in a 24 hour runtime)? Perhaps not; but 10X-20X faster would still put it in the ballpark of the Quicksort implementation that you saw fit to replace, and I have no idea how you are going to be able to make a proper serialisation routine 10X-20X faster than a straight memcpy().

>>2. It can be a free lunch if there is enough computation between accesses
>>and the predictors work well enough that the latency is completely hidden.
>
>My view of performance is that programs move data around,
>and that's what costs the time. ALU operations these days
>are mostly free. I'm pretty sure that's the right way
>to analyze the app I work on.

That may be the case for you, but our code is very computationally intensive. Our most bandwidth-intensive operation still scales by a factor of 3.6 on a 3.5 GHz QX9650, and that has the old FSB.

>For some well-tuned
>compute-intensive kernels you can get a working set in
>registers and/or L1 cache and run for a while in compute-
>bound rather than memory-bound mode. But that's not
>the normal case.

In our case the issue is the processing:byte ratio. The data sets are far too large overall to fit in caches but we only read a little bit at a time.

>One thing I didn't mention yet is that copying the data
>can sometimes reveal more parallelism. Compare to
>register renaming.

Sure, I already alluded to this with the potential advantage of not writing results into shared memory, causing cacheline evictions, for example. In our case, however, for the most part, we can partition the data in the output space. It's the input space that's tricky as each output can access quite a large (and sometimes unpredictable) subset of the input data.

>>There's no issue with the data structures in the serial >case.
>
>I can't make sense of that. Choosing a good data
>structure for each algorithm is the main way to optimize
>code (serial or parallel).

On occasion we have had to completely change algorithms for the parallel case in order to realise a performance gain. In cases where the modified algorithm harms single-threaded performance we actually retain both and select the appropriate one based on the number of threads in use. Sometimes turning a serial problem into a parallel one can require quite a bit of imagination and lateral thinking.

>>I would suggest that trying to do anything remotely complicated with programmers
>>that don't have a clue is a bad idea.
>
>And I would agree with you 110%. But it's the normal case,
>as well as being the particular case I have to deal with.

That's fine, provided you don't extrapolate from that particular case to the value and ease of multithreading in general.

It sounds like you're really programming in C with a little bit of C++ thrown in and very little encapsulation. That's perfectly valid, but it isn't very representative of how easy or difficult it is to thread other types of code and therefore whether people only "occasionally" manage to write correct multithreaded code.
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                                          How much IPCanon2009/08/18 01:27 AM
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                                                                limits of sorting_Arthur2009/08/18 07:57 AM
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                                                                    limits of sortingMichael S2009/08/18 08:50 AM
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                                                                        limits of sortingMichael S2009/08/18 09:33 AM
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                                                                                        limits of sortingRob Thorpe2009/08/19 06:12 AM
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                                                                                        limits of sortingJasonB2009/08/19 07:43 PM
                                                                                          limits of sortingRichard Cownie2009/08/20 06:47 AM
                                                                                            limits of sortingJasonB2009/08/20 07:20 PM
                                                                                              limits of sortingRichard Cownie2009/08/20 10:12 PM
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                                                                                                                      correctionJasonB2009/08/26 06:48 PM
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                                                                                                                        correctionc++2009/08/27 08:29 AM
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                                                                                                                            comeau bugs and gcc featuresPotatoswatter2009/08/27 10:28 AM
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                                                                                                                            wacky C++ featuresRichard Cownie2009/08/28 12:27 AM
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                                                                                                                                wacky C++ featuresEduardoS2009/08/28 05:45 AM
                                                                                                                                wacky C++ featuresRichard Cownie2009/08/28 06:50 AM
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                                                                                                                            wacky C++ featuresJasonB2009/08/28 04:55 PM
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                                                                                                    Windows vs Unix/Linux cultureMichael S2009/08/21 07:07 AM
                                                                                                      Windows vs Unix/Linux cultureRichard Cownie2009/08/21 07:33 AM
                                                                                                      Windows vs Unix/Linux culturePaul2009/08/22 03:12 AM
                                                                                                    Windows vs Unix/Linux cultureanon2009/08/21 10:18 PM
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                                                                                                    Windows vs Unix/Linux cultureJasonB2009/08/22 04:28 PM
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                                                                                                        Windows vs Unix/Linux cultureJasonB2009/08/22 05:52 PM
                                                                                                          Windows vs Unix/Linux cultureRichard Cownie2009/08/22 06:47 PM
                                                                                                        EncapsulationKonrad Schwarz2009/09/03 03:49 AM
                                                                                                          Encapsulationanon2009/09/03 09:05 AM
                                                                                                          Encapsulation?2009/09/03 10:38 AM
                                                                                                          EncapsulationAndi Kleen2009/09/04 12:41 AM
                                                                                                            Encapsulationanon2009/09/04 06:24 AM
                                                                                                            EncapsulationRichard Cownie2009/09/04 06:34 AM
                                                                                                              EncapsulationKonrad Schwarz2009/09/07 02:28 AM
                                                                                                                EncapsulationRichard Cownie2009/09/07 03:04 PM
                                                                                                        Windows vs Unix/Linux culture?2009/09/03 10:51 AM
                                                                                                      Windows vs Unix/Linux cultureno thanks2009/08/23 09:36 AM
                                                                                                        Windows vs Unix/Linux cultureRichard Cownie2009/08/23 03:23 PM
                                                                                                          Windows vs Unix/Linux cultureJasonB2009/08/23 07:31 PM
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                                                                                                                  Windows vs Unix/Linux cultureJasonB2009/08/25 10:48 PM
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                                                                                                                      Windows vs Unix/Linux cultureJasonB2009/08/26 09:31 PM
                                                                                                                    Windows vs Unix/Linux cultureRichard Cownie2009/08/26 07:43 AM
                                                                                                                    Windows vs Unix/Linux cultureanon2009/08/26 12:48 PM
                                                                                                                      Windows vs Unix/Linux cultureRichard Cownie2009/08/26 02:28 PM
                                                                                                                      Windows vs Unix/Linux cultureJasonB2009/08/26 07:06 PM
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                                                                                                                          Windows vs Unix/Linux cultureRob Thorpe2009/08/27 04:51 AM
                                                                                                        Windows vs Unix/Linux cultureJasonB2009/08/23 08:07 PM
                                                                                                          Windows vs Unix/Linux cultureno thanks2009/08/23 08:44 PM
                                                                                                            Windows vs Unix/Linux cultureJasonB2009/08/23 11:34 PM
                                                                                                        Windows vs Unix/Linux cultureanon2009/08/23 08:46 PM
                                                                                          limits of sortingRichard Cownie2009/08/20 06:59 AM
                                                                                            limits of sortingRichard Cownie2009/08/20 08:27 AM
                                                                                              limits of sortingJasonB2009/08/20 07:55 PM
                                                                                                limits of sortingRichard Cownie2009/08/20 10:22 PM
                                                                                                  limits of sortingJasonB2009/08/20 11:15 PM
                                                                                                    limits of sortingRichard Cownie2009/08/21 03:47 AM
                                                                                              limits of sorting?2009/08/20 10:42 PM
                                                                                                limits of sortingRichard Cownie2009/08/21 06:51 AM
                                                                                                  limits of sortingMichael S2009/08/21 07:11 AM
                                                                                                    limits of sortingRichard Cownie2009/08/21 07:38 AM
                                                                                            limits of sortingdmsc2009/08/20 06:56 PM
                                                                                              limits of sortingRichard Cownie2009/08/20 07:20 PM
                                                                                          limits of sortingRob Thorpe2009/08/20 07:09 AM
                                                                              limits of sortingAaron Spink2009/08/19 11:19 PM
                                                                                limits of sortingJasonB2009/08/20 12:55 AM
                                                          limits of sortingMichael S2009/08/18 06:12 AM
                                                        limits of sortinghobold2009/08/18 06:55 AM
                                                          limits of sortingrwessel2009/09/08 01:52 PM
                                                            maximal theoretical sorting efficiencyEmil2009/09/08 06:06 PM
                                                              maximal theoretical sorting efficiencyrwessel2009/09/08 09:04 PM
                                                                maximal theoretical sorting efficiencyhobold2009/09/09 03:56 AM
                                                              maximal theoretical sorting efficiencyRichard Cownie2009/09/09 08:10 AM
                                                                maximal theoretical sorting efficiencyhobold2009/09/10 04:39 AM
                                                                  maximal theoretical sorting efficiencyRichard Cownie2009/09/10 07:05 AM
                                                                    maximal theoretical sorting efficiencyPotatoswatter2009/09/10 12:23 PM
                                                                  maximal theoretical sorting efficiencydmsc2009/09/13 07:04 AM
                                                      limits of sortingPotatoswatter is back!2009/08/21 05:07 PM
                                                        indeed it doesn't succeed in partitioning at all, but you get the idea ;) (NT)Potatoswatter is back!2009/08/21 05:12 PM
                                                          indeed it doesn't succeed in partitioning at all, but you get the idea ;) (NT)Jouni Osmala2009/08/22 12:01 AM
                                                        limits of sortinghobold2009/08/22 06:25 AM
                                                          limits of sortingPotatoswatter2009/08/22 07:45 AM
                                                          limits of sortingDavid Kanter2009/08/22 09:16 AM
                                                            limits of sortingJouni Osmala2009/08/22 11:01 AM
                                                              Oops that was counting sort not bucket sort ;(Jouni Osmala2009/08/22 11:07 AM
                                                                close enough for my purposeshobold2009/08/22 01:15 PM
                                                            select vs. cmovehobold2009/08/22 01:25 PM
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                                                  How much IPC_Arthur2009/08/19 08:32 AM
                                              How much IPChobold2009/08/18 03:17 AM
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                                                How much IPC_Arthur2009/08/18 11:33 AM
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                                                    Nit picking_Arthur2009/08/18 01:37 PM
                                                      Nit pickingMichael S2009/08/18 02:02 PM
                                                        Nit pickingS. Rao2009/08/18 04:02 PM
                                                          Nit pickinganon2009/08/19 02:03 AM
                                                    Nit pickingMichael S2009/08/18 01:53 PM
                                                      Nit pickingJasonB2009/08/18 06:16 PM
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                                                    How much IPC_Arthur2009/08/18 03:23 PM
                                                      How much IPCMatt Sayler2009/08/18 05:09 PM
                                                      How much IPC?2009/08/18 10:59 PM
                                  nick's testcasea reader2009/08/17 04:47 PM
                                How much IPCTruePath2009/09/27 09:00 AM
                                  Explicit dependency chainsDavid Kanter2009/09/30 06:56 PM
                                How much IPCTruePath2009/09/27 09:00 AM
                              How much IPChobold2009/08/17 05:38 AM
                            How much IPCanon2009/08/16 08:59 PM
                            Speeing Up Single ThreadsTruePath2009/09/27 07:58 AM
                      How much IPCanon2009/08/15 07:01 PM
                        How much IPCEduardoS2009/08/16 06:06 AM
                        How much IPCsJ2009/08/16 08:48 PM
              Power7 vs. single threaded performance and licensinganon2009/08/14 02:26 PM
                Power7 vs. single threaded performance and licensingLinus Torvalds2009/08/14 03:04 PM
              Power7 vs. single threaded performance and licensingJonathan Kang2009/08/21 02:43 PM
                Power7 vs. single threaded performance and licensingLinus Torvalds2009/08/21 03:08 PM
                  Power7 vs. single threaded performance and licensingLinus Torvalds2009/08/21 03:33 PM
                    Power7 vs. single threaded performance and licensingJonathan Kang2009/08/22 07:57 AM
                      Power7 vs. single threaded performance and licensingJukka Larja2009/08/22 10:04 PM
                        Power7 vs. single threaded performance and licensingJonathan Kang2009/08/25 11:33 AM
                  Power7 vs. single threaded performance and licensing?2009/08/21 11:51 PM
                    Power7 vs. single threaded performance and licensinganon2009/08/22 09:56 AM
                      Power7 vs. single threaded performance and licensingLinus Torvalds2009/08/22 10:38 AM
                      Power7 vs. single threaded performance and licensing?2009/08/23 03:05 AM
                        Power7 vs. single threaded performance and licensingEduardoS2009/08/23 03:28 AM
                          Programming Larrabee?2009/08/23 05:48 AM
                            Programming LarrabeeEduardoS2009/08/23 06:41 AM
                              Programming Larrabeeanon2009/08/23 07:29 AM
                            Programming LarrabeePotatoswatter2009/08/23 06:47 AM
                              Programming LarrabeeRichard Cownie2009/08/23 08:11 AM
                                Programming LarrabeePotatoswatter2009/08/23 11:49 PM
                              Programming Larrabee?2009/08/23 08:59 AM
                                Programming LarrabeePotatoswatter2009/08/23 11:44 PM
                                Programming Larrabeehobold2009/08/24 05:41 AM
                                  Programming Larrabeenone2009/08/24 07:15 AM
                                    Programming LarrabeeRichard Cownie2009/08/24 07:33 AM
                                    Programming LarrabeeJukka Larja2009/08/24 09:30 PM
                                      Programming Larrabeenone2009/08/25 01:53 AM
                            Programming Larrabeempx2009/08/25 08:16 AM
                  Power7 vs. single threaded performance and licensingJoe2009/08/24 08:38 AM
            Power7 vs. single threaded performance and licensingGabriele Svelto2009/08/14 03:35 AM
              Power7 vs. single threaded performance and licensinganon2009/08/14 08:18 AM
                Power7 vs. single threaded performance and licensingEduardoS2009/08/14 04:34 PM
                  Power7 vs. single threaded performance and licensinganon2009/08/15 06:30 AM
                    Power7 vs. single threaded performance and licensinganon2009/08/15 07:23 AM
                improving NetburstAM2009/08/15 01:36 AM
                  improving Netburstanon2009/08/15 07:10 AM
                    improving NetburstEuronymous2009/08/15 08:35 AM
                    improving NetburstMichael S2009/08/15 01:18 PM
                Power7 vs. single threaded performance and licensingJonathan Kang2009/08/21 03:10 PM
                  Power7 vs. single threaded performance and licensinganon2009/08/22 09:46 AM
                    Power7 vs. single threaded performance and licensingJonathan Kang2009/08/25 09:39 AM
                      Power7 vs. single threaded performance and licensingslacker2009/08/26 04:50 AM
                        Power7 vs. single threaded performance and licensingJonathan Kang2009/08/26 08:12 AM
                        Power7 vs. single threaded performance and licensingJonathan Kang2009/08/26 08:45 AM
                          Power7 vs. single threaded performance and licensingsomeone2009/08/26 10:29 AM
                            Power7 vs. single threaded performance and licensingDavid Kanter2009/08/26 10:47 AM
          Not necessarilyDaniel Bizó2009/08/14 02:53 AM
        new POWER7 info ..Thu Nguyen2009/08/25 03:05 AM
          new POWER7 info ..someone2009/08/25 05:47 AM
            new POWER7 info ..hobold2009/08/25 06:50 AM
              new POWER7 info ..G Webb2009/08/25 11:49 PM
            new POWER7 info ..mpx2009/08/25 07:36 AM
              new POWER7 info ..someone2009/08/25 08:16 AM
                new POWER7 info ..Jesper Frimann2009/08/27 08:18 AM
                  new POWER7 info ..Linus Torvalds2009/08/27 10:53 AM
                  new POWER7 info ..someone2009/08/27 12:00 PM
                    new POWER7 info ..a reader2009/08/27 03:21 PM
                      new POWER7 info ..David Kanter2009/08/27 08:32 PM
                        new POWER7 info ..a reader2009/08/28 07:45 AM
                    new POWER7 info ..hobold2009/08/28 04:00 AM
                      new POWER7 info ..someone2009/08/28 05:51 AM
                        new POWER7 info ..hobold2009/08/28 06:44 AM
                          new POWER7 info ..someone2009/08/28 07:10 AM
                        Non Autopar submissions for NehalemIlleglWpns2009/08/28 09:41 AM
                          Non Autopar submissions for NehalemDavid Kanter2009/08/28 10:07 AM
                          Non Autopar submissions for Nehalemsomeone2009/08/28 11:00 AM
          new POWER7 info ..mas2009/08/25 11:25 PM
            An EV8 lite? (NT)anon2009/08/26 08:21 AM
              An EV8 lite? => Piranha?M.2009/08/30 03:54 AM
            new POWER7 info ..Mark Roulo2009/08/27 05:51 AM
              new POWER7 info ..someone2009/08/27 06:03 AM
                new POWER7 info ..a reader2009/08/27 08:55 AM
                  new POWER7 info ..someone2009/08/27 10:58 AM
                    new POWER7 info ..a reader2009/08/27 03:11 PM
                      new POWER7 info ..Gabriele Svelto2009/08/27 11:17 PM
                      new POWER7 info ..someone2009/08/28 04:27 AM
                        new POWER7 info ..a reader2009/08/28 08:07 AM
                        OOOE for low powerDavid Kanter2009/08/28 10:15 AM
                          OOOE for low powersomeone2009/08/28 10:39 AM
                            OOOE for low powerDavid Kanter2009/08/28 12:55 PM
                              OOOE for low powerMark Roulo2009/08/28 02:16 PM
                                OOOE for low powerMark Roulo2009/08/28 02:44 PM
                                  Atom uarchDavid Kanter2009/08/28 07:19 PM
                                OOOE for low powerDavid Kanter2009/08/28 07:07 PM
                              OOOE for low powersomeone2009/08/28 03:18 PM
                                OOOE for low powerDavid Kanter2009/08/29 12:55 AM
                                  OOOE for low powersomeone2009/08/29 06:21 AM
                                    OOOE for low powera reader2009/08/29 08:14 AM
                                      OOOE for low powersomeone2009/08/29 08:56 AM
                                        OOOE for low powerDavid Kanter2009/08/29 09:08 AM
                                      OOOE for low powerMichael S2009/08/29 10:27 AM
                                        OOOE for low powera reader2009/08/29 03:50 PM
                                        OOOE for low poweranonymous2009/08/29 06:17 PM
                                          OOOE for low powerMichael S2009/08/29 11:07 PM
                                            OOOE for low powerJonathan Kang2009/09/01 04:44 AM
                                              OOOE for low powerMichael S2009/09/01 03:21 PM
                                                OOOE for low powerMark Roulo2009/09/01 04:53 PM
                                                  OOOE for low powerWilco2009/09/02 01:27 AM
                                                    OOOE for low powerMark Roulo2009/09/02 07:46 AM
                                                      OOOE for low powerWilco2009/09/02 03:52 PM
                                                    Define "emulate" (NT)Michael S2009/09/02 10:44 PM
                                                      Define "emulate"Wilco2009/09/02 11:33 PM
                                                        Define "emulate"none2009/09/03 03:46 AM
                                                          Define "emulate"Adrian2009/09/03 09:45 AM
                                                          Define "emulate"Wilco2009/09/03 01:20 PM
                                                            Define "emulate"none2009/09/03 09:41 PM
                                                              Define "emulate"Wilco2009/09/04 02:30 AM
                                                  low power ARM chipsMichael S2009/10/31 01:32 PM
                                                    low power ARM chipsGabriele Svelto2009/10/31 03:05 PM
                                                      low power ARM chipsMichael S2009/10/31 03:45 PM
                                                        low power ARM chipst2009/10/31 04:21 PM
                                    OOOE for low powerDavid Kanter2009/08/29 09:07 AM
                                      OOOE for low powersomeone2009/08/29 11:40 AM
                                        OOOE for low powera reader2009/08/29 04:03 PM
                                        OOOE for low poweranonymous2009/08/29 06:13 PM
                                          OOOE for low powersomeone2009/08/30 06:35 AM
                                            OOOE for low powerDavid Kanter2009/08/30 01:32 PM
                                            OOOE for low powerMatt Sayler2009/08/31 12:38 PM
                                        OOOE for low powerDavid Kanter2009/08/30 11:07 AM
                                    OOOE for low powerMichael S2009/08/29 10:44 AM
                                  TTMMichael S2009/08/29 11:24 AM
                                    TTMFoo_2009/08/29 12:40 PM
                                      TTMMichael S2009/08/29 01:10 PM
                                        TTManon2009/08/29 06:33 PM
                                          TTMJukka Larja2009/08/29 08:49 PM
                                            TTManon2009/08/30 05:07 AM
                                              TTMJukka Larja2009/08/30 08:31 PM
                                                Area, power and AtomDavid Kanter2009/08/30 09:36 PM
                                                  Area, power and AtomMichael S2009/08/30 11:18 PM
                                                    Area, power and Atoma reader2009/08/31 07:44 AM
                                                      Area, power and AtomMichael S2009/08/31 11:19 AM
                                                        Area, power and Atoma reader2009/08/31 01:53 PM
                                                          Area, power and Atomanonymous2009/08/31 03:17 PM
                                                        Area, power and AtomGabriele Svelto2009/08/31 02:41 PM
                                                          64-bit disabled AtomsFoo_2009/09/02 03:38 AM
                                                            64-bit disabled AtomsRobert David Graham2009/09/02 11:56 AM
                                                              64-bit disabled Atomsanon2009/09/02 01:14 PM
                                                              64-bit disabled Atomsanonymous2009/09/02 03:30 PM
                                                TTMMichael S2009/08/30 10:49 PM
                                                  TTMJukka Larja2009/08/31 10:23 PM
                                            TTMPaul2009/08/30 05:38 AM
                                            TTMPaul2009/08/30 05:40 AM
                                        TTMMark Roulo2009/08/30 08:50 AM
                                          TTMPaul2009/08/30 08:54 AM
                                            TTMMark Roulo2009/08/30 09:16 AM
                                        TTMFoo_2009/09/02 03:31 AM
                                  OOOE for low powerRob Thorpe2009/08/30 08:19 AM
                                OOOE for low powerMichael S2009/08/29 10:16 AM
                                  OOOE for low powerJukka Larja2009/08/29 08:40 PM
                                    OOOE for low powerMichael S2009/08/29 11:04 PM
                          OOOE and cache/mem sizesRichard Cownie2009/08/28 04:30 PM
                            OOOE and cache/mem sizesLinus Torvalds2009/08/31 09:53 PM
                              OOOE and cache/mem sizesRichard Cownie2009/09/01 03:15 AM
                                OOOE and pipe length etc.AM2009/09/01 07:35 AM
                                  OOOE and pipe length etc.Jouni Osmala2009/09/01 07:57 AM
                                    OOOE and clock rateAM2009/09/02 12:34 AM
                                      OOOE and clock rateJouni Osmala2009/09/02 04:35 AM
                                        OOOE and clock rateMartin Høyer Kristiansen2009/09/02 05:19 AM
                                          OOOE and clock rateanon2009/09/02 08:43 PM
                                        OOOE and clock rateAM2009/09/03 01:52 AM
                                          OOOE and clock rateJouni Osmala2009/09/03 06:34 AM
                                            OOOE impactsAM2009/09/04 01:04 AM
                                              OOOE impactsDavid Kanter2009/09/04 09:12 AM
                                              OOOE impactsJouni Osmala2009/09/06 11:16 AM
                                                OOOE impactsAM2009/09/07 02:47 AM
                                                  OOOE impactsMartin Høyer Kristiansen2009/09/07 05:03 AM
                                                    Does IBM lie about PPC603 being OoO chip?AM2009/09/08 02:13 AM
                                                      No, but...Michael S2009/09/08 06:05 AM
                                                        No, but...hobold2009/09/09 04:09 AM
                                                  OOOE impactsJS2009/09/07 05:34 AM
                                                    Are Sandpile and others wrong about 0.28 um?AM2009/09/08 02:12 AM
                                                    OOOE impactssomeone2009/09/08 05:43 AM
                                                  OOOE impactsJouni Osmala2009/09/07 06:48 AM
                                                    OOOE costsDavid Kanter2009/09/07 11:07 AM
                                                    OOOE impactsAM2009/09/08 02:11 AM
                                                      OOOE impactsJouni Osmala2009/09/10 12:53 AM
                                                        OOOE impactsAM2009/09/11 03:35 AM
                                                          OOOE impactsJouni Osmala2009/09/11 07:38 AM
                                                            OOOE impactsAM2009/09/12 04:06 AM
                                                              OOOE impactsJouni Osmala2009/09/12 10:36 PM
                                                                OOOE impactsAM2009/09/14 03:39 AM
                                                                  OOOE impactsJouni Osmala2009/09/14 05:18 AM
                                                                    if-ex distanceAM2009/09/15 04:16 AM
                                                                    small addendumAM2009/09/19 02:54 AM
                                                                      small addendumJouni Osmala2009/09/19 08:51 PM
                                                                        small addendumAM2009/09/20 05:54 AM
                                                                          small addendumJouni Osmala2009/09/20 12:16 PM
                                                                            small addendumThiago Kurovski2009/09/20 03:51 PM
                                                                              small addendumJouni Osmala2009/09/20 08:21 PM
                                                                                small addendumThiago Kurovski2009/09/21 05:59 AM
                                                                            small addendumAM2009/09/21 02:14 AM
                                                                              small addendumJukka Larja2009/09/21 09:21 PM
                                                                                small addendumAM2009/09/22 02:01 AM
                                                                                  small addendumJukka Larja2009/09/22 10:31 PM
                                                                                    small addendumAM2009/09/23 07:35 AM
                                                                                      small addendumJukka Larja2009/09/23 09:31 PM
                                                                                        small addendumAM2009/09/23 11:13 PM
                                                                                          OT metadiscussionJukka Larja2009/09/24 08:39 PM
                                                                                            OT metadiscussionAM2009/09/25 04:18 AM
                                                                                              Back to bitsMichael S2009/09/25 06:14 AM
                                                                                                Back to bitsThiago Kurovski2009/09/25 10:24 AM
                                                                                                  Back to bitsWilco2009/09/25 02:18 PM
                                                                                                    Back to bitsThiago Kurovski2009/09/26 08:12 AM
                                                                                                  Back to bitsMichael S2009/09/26 07:54 AM
                                                                                                    Back to bitsThiago Kurovski2009/09/26 08:05 AM
                                                                                                      Back to bitsMichael S2009/09/26 08:16 AM
                                                                                                Agree, with very minor change.Jouni Osmala2009/09/25 08:37 PM
                                                                                                Back to bitsAM2009/09/26 05:16 AM
                                                                                                  Back to bitsMichael S2009/09/26 08:13 AM
                                                                                              OT metadiscussionDavid Kanter2009/09/25 11:23 AM
                                                                                                OT metadiscussionAM2009/09/26 04:55 AM
                                                                                              OT metadiscussionJukka Larja2009/09/25 10:33 PM
                                                                                                OT metadiscussionAM2009/09/26 04:50 AM
                                                                                                  OT metadiscussionJukka Larja2009/09/27 01:16 AM
                                                                                                    OT metadiscussionMichael S2009/09/27 03:58 AM
                                                                                                      OT metadiscussionAM2009/09/28 03:07 AM
                                                                                                    OT metadiscussionAM2009/09/28 02:43 AM
                                                                                                      OT metadiscussionJukka Larja2009/09/28 11:45 PM
                                                                                                        OT metadiscussionAM2009/09/30 02:13 AM
                                                                                                          OT metadiscussionJukka Larja2009/10/01 12:34 AM
                                                                                                            OT metadiscussionAM2009/10/01 03:05 AM
                                                                                                              OT metadiscussionJukka Larja2009/10/01 11:38 PM
                                                                                                                OT metadiscussionAM2009/10/03 06:19 AM
                                                                                                                  OT metadiscussionJukka Larja2009/10/04 02:38 AM
                                                                                                                    OT metadiscussionAM2009/10/04 07:27 AM
                                                                                                                      OT metadiscussionJukka Larja2009/10/04 10:48 PM
                                                                                                                        OT metadiscussionAM2009/10/05 06:13 AM
                                                                                                                          About teachingJukka Larja2009/10/05 10:36 PM
                                                                                                                            About teachingAM2009/10/06 03:37 AM
                                                                                                                              About teachingJukka Larja2009/10/07 02:15 AM
                                                                                                                                About teachinganon2009/10/07 11:39 AM
                                                                                                                                About teachingAM2009/10/08 02:11 AM
                                                                                                                                  About teachingJukka Larja2009/10/09 03:10 AM
                                                                                                                                    About teachingAM2009/10/09 04:40 AM
                                                                                                                                      About teachingJukka Larja2009/10/09 08:02 PM
                                                                                                                                        About teachingAM2009/10/09 10:24 PM
                                                                                                                                          About teachingJukka Larja2009/10/10 09:50 PM
                                                                                                                                            About teachingAM2009/10/12 01:02 AM
                                                                                                                                              About teachingJukka Larja2009/10/12 09:51 PM
                                                                                                                                                About teachingAM2009/10/13 03:06 AM
                                                                                                                                                  About teachingJukka Larja2009/10/13 10:33 PM
                                                                                                                                                    About teachingAM2009/10/14 02:36 AM
                                                                                                                                                      About teachingJukka Larja2009/10/14 07:19 PM
                                                                                                                                                        About teachingAM2009/10/15 03:22 AM
                                                                                                                                          About teachingSalvatore De Dominicis2009/10/12 01:23 AM
                                                                                                                                            About teachingDean Kent2009/10/12 11:25 AM
                                                                                                                                              About teachingSalvatore De Dominicis2009/10/13 01:11 AM
                                                                                                OT metadiscussionSeni2009/09/26 05:26 AM
                                                                                                  OT metadiscussionWilco2009/09/26 07:08 AM
                                                                                                  OT metadiscussionJukka Larja2009/09/27 01:18 AM
                                                                                                    OT metadiscussionMichael S2009/09/27 04:12 AM
                                                                                          small addendumJouni Osmala2009/09/24 09:04 PM
                                                                                            small addendumAM2009/09/25 04:04 AM
                                                                                            extra stage in EV6AM2009/09/26 05:29 AM
                                                    PPC603 does OoOEhobold2009/09/08 04:40 AM
                                                  OOOE impactssomeone2009/09/08 04:39 AM
                                                    EV6AM2009/09/09 03:33 AM
                                      OOOE and clock rateSeni2009/09/02 08:11 AM
                                        OOOE and clock rateLinus Torvalds2009/09/02 05:48 PM
                                          OOOE and clock rateanon2009/09/02 10:55 PM
                                            OOOE and clock rateWilco2009/09/02 11:44 PM
                                              OOOE and clock rateJouni Osmala2009/09/03 12:02 AM
                                                OOOE and ItaniumAM2009/09/03 12:27 AM
                                                OOOE and clock rateMartin Høyer Kristiansen2009/09/03 02:41 AM
                                              OOOE and clock rateanon2009/09/03 12:12 AM
                                                OOOE and clock rateWilco2009/09/03 01:10 AM
                                            POWER6 skewed pipelinePaul A. Clayton2009/09/03 10:22 AM
                                              POWER6 skewed pipelineAnon42009/09/03 06:00 PM
                                          OOOE and clock rateMr. Camel2009/09/03 02:40 AM
                                          OOOE and clock rateRichard Cownie2009/09/03 05:42 AM
                                  OOOE and pipe length etc.Richard Cownie2009/09/01 08:01 AM
                                    OOOE and pipe length etc.AM2009/09/02 12:32 AM
                                      OOOE and pipe length etc.Richard Cownie2009/09/02 06:49 AM
                                        LRB choice of P54AM2009/09/03 12:40 AM
                                          LRB choice of P54Gian-Carlo Pascutto2009/09/03 12:45 AM
                                            LRB choice of P54AM2009/09/03 02:18 AM
                                              LRB choice of P54Gian-Carlo Pascutto2009/09/03 02:55 AM
                                                LRB choice of P54AM2009/09/03 03:28 AM
                                                  LRB choice of P54Gian-Carlo Pascutto2009/09/03 04:29 AM
                                                    Amount of cache per core matters,and mem bandwith too (NT)Jouni Osmala2009/09/03 06:44 AM
                                                    LRB choice of P54rwessel2009/09/03 01:31 PM
                                                    LRB choice of P54AM2009/09/04 01:24 AM
                                                  LRB choice of P54anon2009/09/03 05:40 AM
                                                    LRB choice of P54a reader2009/09/03 08:20 AM
                                                      LRB choice of P54anon2009/09/03 04:57 PM
                                                    LRB choice of P54Jonathan Kang2009/09/03 01:30 PM
                                                      LRB choice of P54David Kanter2009/09/03 03:38 PM
                                                        LRB choice of P54Jonathan Kang2009/09/04 07:16 AM
                                                      LRB choice of P54anon2009/09/03 05:07 PM
                                                        LRB choice of P54AM2009/09/04 01:20 AM
                                                        LRB choice of P54Jonathan Kang2009/09/04 07:13 AM
                                                          LRB choice of P54Dan Downs2009/09/04 07:38 AM
                                                            LRB choice of P54Dan Downs2009/09/05 03:36 AM
                                                              LRB choice of P54Anon2009/09/05 01:44 PM
                                                          LRB choice of P54AM2009/09/04 11:12 PM
                                                    LRB choice of P54AM2009/09/04 01:18 AM
                                                      LRB choice of P54anon2009/09/04 07:18 PM
                                                        LRB choice of P54AM2009/09/04 10:53 PM
                                                          LRB choice of P54anon2009/09/05 03:06 AM
                                                            LRB choice of P54AM2009/09/05 08:14 AM
                                                  LRB choice of P54 - Layout?Anonymous2009/09/03 01:40 PM
                                                    LRB choice of P54 - Layout?anonymous2009/09/03 02:54 PM
                                                  LRB choice of P54Jukka Larja2009/09/03 08:58 PM
                                                  LRB choice of P54mpx2009/09/04 03:07 AM
                                          LRB choice of P54anon2009/09/03 01:02 AM
                                        OOOE and pipe length etc.Gian-Carlo Pascutto2009/09/03 12:40 AM
                                      Larrabee: Pentium vs 486 vs 386Mark Roulo2009/09/03 03:26 PM
                                        Larrabee: Pentium vs 486 vs 386Michael S2009/09/03 04:14 PM
                                          Larrabee: Pentium vs 486 vs 386Mark Roulo2009/09/04 09:05 AM
                                            Larrabee: Pentium vs 486 vs 386Jonathan Kang2009/09/04 09:59 AM
                                            Larrabee: Pentium vs 486 vs 386Michael S2009/09/05 08:58 AM
                                            Larrabee: Pentium vs 486 vs 386James2009/09/07 02:15 AM
                                              Larrabee: Pentium vs 486 vs 386Mark Roulo2009/09/07 06:44 PM
                                      OOOE and pipe length etc.Michael S2009/09/03 04:42 PM
                                        LRB coreAM2009/09/04 01:09 AM
                                          LRB coreMichael S2009/09/04 04:07 AM
                                            LRB coreanon2009/09/04 07:27 PM
                                              LRB coreMichael S2009/09/05 09:12 AM
                                                LRB coreanon2009/09/05 10:03 PM
                                                  reasons for split I/D L1 cachesMichael S2009/09/06 03:10 AM
                                                    reasons for split I/D L1 cachesanon2009/09/06 05:32 AM
                                                      reasons for split I/D L1 caches?2009/09/06 09:35 AM
                                                        reasons for split I/D L1 cachesmegol2009/09/06 02:39 PM
                                                          reasons for split I/D L1 caches?2009/09/07 03:20 AM
                                                            reasons for split I/D L1 cachesanon2009/09/07 05:25 AM
                                                              cache hinting?2009/09/07 06:10 AM
                                                                cache hintinganon2009/09/07 06:35 AM
                                                                  cache hinting?2009/09/07 08:10 AM
                                                                    cache hintinganon2009/09/07 08:49 AM
                                                                      cache hinting?2009/09/07 09:37 AM
                                              Split and unified cachesDavid Kanter2009/09/06 12:38 PM
                                                Split and unified cachesanon2009/09/06 10:15 PM
                                                  Split and unified cachesMichael S2009/09/06 11:40 PM
                                                    Split and unified cachesanon2009/09/07 01:24 AM
                                                  Split and unified cachesDavid Kanter2009/09/06 11:51 PM
                                                    Split and unified cachesanon2009/09/07 01:13 AM
                                            LRB coreAM2009/09/04 11:08 PM
                                            LRB coreLinus Torvalds2009/09/05 09:47 AM
                                          LRB coreDavid Kanter2009/09/04 12:23 PM
                                            LRB coreAnon2009/09/04 05:32 PM
                                              LRB coreDavid Kanter2009/09/04 09:15 PM
                                              LRB coreMichael S2009/09/05 09:21 AM
                              OOOE and cache/mem sizesa reader2009/09/01 08:19 AM
                                OOOE and cache/mem sizesRichard Cownie2009/09/01 08:43 AM
                      snapdraon?Michael S2009/08/28 05:10 AM
                        snapdraon?a reader2009/08/28 07:51 AM
                          Thanks (NT)Michael S2009/08/29 11:53 AM
                        snapdraon?Paul2009/08/28 12:12 PM
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How do you spell avocado?