Programming Larrabee

Article: Hot Chips XXI Preview
By: ? (, August 23, 2009 9:59 am
Room: Moderated Discussions
Potatoswatter ( on 8/23/09 wrote:
>? ( on 8/23/09 wrote:
>>EduardoS ( on 8/23/09 wrote:
>>>And why someone would ever want that when running those process on a normal CPU would be much more efficient?
>>>With the need to recompile (I'm being nice, you ill probably have to rewrite, like
>>>you need for OpenCL/CUDA/Brook+) code for Larrabee to get some improvement the x86
>>>compalibilty is just marketing BS, a marketing BS that works tought, with so many
>>>people repeating that Larrabee will be easier to program...
>>You are underestimating the significance of "the ability to perform small incremental
>>improvements to the existing code-base". A typical scenario for optimizing *parallelizable*
>>code for LRB *will* in many cases look like this:
>>1. Reprogram selected code to run with 50+ threads. Do this in C/C++/Python/whatever
>>programming language. The code can still use all Linux system calls, standard
>libraries and almost all other libraries.
>>2. Repeat step 1 until you get it right.
>>3. Reprogram selected code to take advantage of SIMD. Do this in C/C++/whatever
>>language with a library that has support for Larrabee.
>>4. Repeat step 3 until you get it right. Sometimes you will have to go to step 1.
>Alas, 50x multithreading isn't trivial. If things worked that way, we'd already
>be using tons of little processors. Larabee works with units equivalent to a 486,
>but why weren't we working with 50x 68000's ten years ago?

Maybe because it was technically impossible to place 50 such cores on one chip? Even if one imagines that it could have been done, the price of such a chip would be astronomical.

>You're presuming that Python, Linux+Bash, whatever open-source support libraries,
>are perfectly suitable for a massively parallel HPC setup,

Well, not really. The basic idea behind my suggestion is that the "space" available to LRB is much larger than the "space" available to CUDA/OpenCL. By "space" I mean the totality of options you have at your disposal as a programmer. A hypothetical scenario involving Python might include optimized functions implemented in C which are being called from Python. In addition, the C functions will be able to do anything a usual C function can do, including invoking Python code from C. Can anyone tell the same in the context of OpenCL?

I am not implying it will be trivial.

> and they're not. HPC
>Linux has been around for ages and it's still nontrivial.

I didn't mean to imply it will be trivial.

>GPUs just as often give a boost from single-threaded SIMD operation and beefy memory chips as from being multicore.
>But it's easy to saturate the memory with a few pointers when there's no cache.
>It will be interesting to see how Larrabee does with GPU-like programming effort, but it will do TERRIBLY without that.

My educated guess is that single-threaded non-SIMD performance of LRB will be somewhere between the performance of Atom and Core2. I would not call this "terrible".

>A developer like your novice will repeat step 1 to frustration, and maybe then
>implement SIMD on a conventional processor to possibly some gains.
>>Notice that if you end at step 2, your program will be able to run *without recompilation*
>>on both Core2/Phenom/Atom/etc AND Larrabee.
>Running terribly without recompilation doesn't get you much of anywhere. In the
>best case where they use a programming tool which says "eliminate this mutex 4 tha
>winz", and it points into their runtime, they'll just be giving up that much faster.

1. Why?
2. Are you implying that in OpenCL it will be easier? Unlikely.

>>Notice that if SIMD-ize you program, it will be able to (sub-optimally) run *without
>>reprogramming* on Core2/Phenom/Atom/etc. You *just* need to recompile it. Why? Because
>>Intel already provided developers with a C library which is emulating all LRB instructions.
>Or just use SSE. Oh yeah, I forgot, SSE leaves all the performance on the table by not being 16-way.

1. The library is already able to utilize SSE. So at least it will be 4-way or 2-way (in certain cases).
2. A small speedup is caused by the fact that Core2/Phenom are out-of-order 3-4 issue cores, while LRB is not. This is quite important for estimating execution time of LRB instructions on Core2/etc.

>>And CUDA/OpenCL:
>>1. Restructure your code to work without nested function calls, pointers to pointers,
>>bit-fields, system libraries, OS calls, and any other libraries you are usually
>>using. What a nice and easy step this is! You will truly feel like living in the 1950s.
>Nested function calls, structures, and bitfields are all fine far as I know. You're
>faster without them, but they work. You shouldn't need any libraries beside Linpack/Lapack.

I don't recall any game engine which heavily uses Linpack/Lapack. And neither any ray-tracing engine. I do not recall any dynamic code generator which uses Linpack/Lapack. I do not ...

>If you are, you'll likely be in Amdahl's law doo-doo.
>>2. Reprogram selected code to run efficiently in CUDA/OpenCL computing model. Do this in CUDA/OpenCL.
>CUDA sucks, but OpenCL shows some promise to me. In any case, HPC has always required
>some thought and will for the foreseeable future. You have to understand that you only go as fast as the weakest link.

Are you implying that the speed of data accesses in your program equals to the speed processor<->memory? Or to the speed register<->disk, or register<->network?
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                                                                                                          Encapsulationanon2009/09/03 10:05 AM
                                                                                                          Encapsulation?2009/09/03 11:38 AM
                                                                                                          EncapsulationAndi Kleen2009/09/04 01:41 AM
                                                                                                            Encapsulationanon2009/09/04 07:24 AM
                                                                                                            EncapsulationRichard Cownie2009/09/04 07:34 AM
                                                                                                              EncapsulationKonrad Schwarz2009/09/07 03:28 AM
                                                                                                                EncapsulationRichard Cownie2009/09/07 04:04 PM
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                                                                                                                    Windows vs Unix/Linux cultureanon2009/08/26 01:48 PM
                                                                                                                      Windows vs Unix/Linux cultureRichard Cownie2009/08/26 03:28 PM
                                                                                                                      Windows vs Unix/Linux cultureJasonB2009/08/26 08:06 PM
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                                                                                                            Windows vs Unix/Linux cultureJasonB2009/08/24 12:34 AM
                                                                                                        Windows vs Unix/Linux cultureanon2009/08/23 09:46 PM
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                                                                                            limits of sortingRichard Cownie2009/08/20 09:27 AM
                                                                                              limits of sortingJasonB2009/08/20 08:55 PM
                                                                                                limits of sortingRichard Cownie2009/08/20 11:22 PM
                                                                                                  limits of sortingJasonB2009/08/21 12:15 AM
                                                                                                    limits of sortingRichard Cownie2009/08/21 04:47 AM
                                                                                              limits of sorting?2009/08/20 11:42 PM
                                                                                                limits of sortingRichard Cownie2009/08/21 07:51 AM
                                                                                                  limits of sortingMichael S2009/08/21 08:11 AM
                                                                                                    limits of sortingRichard Cownie2009/08/21 08:38 AM
                                                                                            limits of sortingdmsc2009/08/20 07:56 PM
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                                                          limits of sortingrwessel2009/09/08 02:52 PM
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                                                              maximal theoretical sorting efficiencyrwessel2009/09/08 10:04 PM
                                                                maximal theoretical sorting efficiencyhobold2009/09/09 04:56 AM
                                                              maximal theoretical sorting efficiencyRichard Cownie2009/09/09 09:10 AM
                                                                maximal theoretical sorting efficiencyhobold2009/09/10 05:39 AM
                                                                  maximal theoretical sorting efficiencyRichard Cownie2009/09/10 08:05 AM
                                                                    maximal theoretical sorting efficiencyPotatoswatter2009/09/10 01:23 PM
                                                                  maximal theoretical sorting efficiencydmsc2009/09/13 08:04 AM
                                                      limits of sortingPotatoswatter is back!2009/08/21 06:07 PM
                                                        indeed it doesn't succeed in partitioning at all, but you get the idea ;) (NT)Potatoswatter is back!2009/08/21 06:12 PM
                                                          indeed it doesn't succeed in partitioning at all, but you get the idea ;) (NT)Jouni Osmala2009/08/22 01:01 AM
                                                        limits of sortinghobold2009/08/22 07:25 AM
                                                          limits of sortingPotatoswatter2009/08/22 08:45 AM
                                                          limits of sortingDavid Kanter2009/08/22 10:16 AM
                                                            limits of sortingJouni Osmala2009/08/22 12:01 PM
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                                                        Nit pickingS. Rao2009/08/18 05:02 PM
                                                          Nit pickinganon2009/08/19 03:03 AM
                                                    Nit pickingMichael S2009/08/18 02:53 PM
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                                                    How much IPC_Arthur2009/08/18 04:23 PM
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                      How much IPCanon2009/08/15 08:01 PM
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                        How much IPCsJ2009/08/16 09:48 PM
              Power7 vs. single threaded performance and licensinganon2009/08/14 03:26 PM
                Power7 vs. single threaded performance and licensingLinus Torvalds2009/08/14 04:04 PM
              Power7 vs. single threaded performance and licensingJonathan Kang2009/08/21 03:43 PM
                Power7 vs. single threaded performance and licensingLinus Torvalds2009/08/21 04:08 PM
                  Power7 vs. single threaded performance and licensingLinus Torvalds2009/08/21 04:33 PM
                    Power7 vs. single threaded performance and licensingJonathan Kang2009/08/22 08:57 AM
                      Power7 vs. single threaded performance and licensingJukka Larja2009/08/22 11:04 PM
                        Power7 vs. single threaded performance and licensingJonathan Kang2009/08/25 12:33 PM
                  Power7 vs. single threaded performance and licensing?2009/08/22 12:51 AM
                    Power7 vs. single threaded performance and licensinganon2009/08/22 10:56 AM
                      Power7 vs. single threaded performance and licensingLinus Torvalds2009/08/22 11:38 AM
                      Power7 vs. single threaded performance and licensing?2009/08/23 04:05 AM
                        Power7 vs. single threaded performance and licensingEduardoS2009/08/23 04:28 AM
                          Programming Larrabee?2009/08/23 06:48 AM
                            Programming LarrabeeEduardoS2009/08/23 07:41 AM
                              Programming Larrabeeanon2009/08/23 08:29 AM
                            Programming LarrabeePotatoswatter2009/08/23 07:47 AM
                              Programming LarrabeeRichard Cownie2009/08/23 09:11 AM
                                Programming LarrabeePotatoswatter2009/08/24 12:49 AM
                              Programming Larrabee?2009/08/23 09:59 AM
                                Programming LarrabeePotatoswatter2009/08/24 12:44 AM
                                Programming Larrabeehobold2009/08/24 06:41 AM
                                  Programming Larrabeenone2009/08/24 08:15 AM
                                    Programming LarrabeeRichard Cownie2009/08/24 08:33 AM
                                    Programming LarrabeeJukka Larja2009/08/24 10:30 PM
                                      Programming Larrabeenone2009/08/25 02:53 AM
                            Programming Larrabeempx2009/08/25 09:16 AM
                  Power7 vs. single threaded performance and licensingJoe2009/08/24 09:38 AM
            Power7 vs. single threaded performance and licensingGabriele Svelto2009/08/14 04:35 AM
              Power7 vs. single threaded performance and licensinganon2009/08/14 09:18 AM
                Power7 vs. single threaded performance and licensingEduardoS2009/08/14 05:34 PM
                  Power7 vs. single threaded performance and licensinganon2009/08/15 07:30 AM
                    Power7 vs. single threaded performance and licensinganon2009/08/15 08:23 AM
                improving NetburstAM2009/08/15 02:36 AM
                  improving Netburstanon2009/08/15 08:10 AM
                    improving NetburstEuronymous2009/08/15 09:35 AM
                    improving NetburstMichael S2009/08/15 02:18 PM
                Power7 vs. single threaded performance and licensingJonathan Kang2009/08/21 04:10 PM
                  Power7 vs. single threaded performance and licensinganon2009/08/22 10:46 AM
                    Power7 vs. single threaded performance and licensingJonathan Kang2009/08/25 10:39 AM
                      Power7 vs. single threaded performance and licensingslacker2009/08/26 05:50 AM
                        Power7 vs. single threaded performance and licensingJonathan Kang2009/08/26 09:12 AM
                        Power7 vs. single threaded performance and licensingJonathan Kang2009/08/26 09:45 AM
                          Power7 vs. single threaded performance and licensingsomeone2009/08/26 11:29 AM
                            Power7 vs. single threaded performance and licensingDavid Kanter2009/08/26 11:47 AM
          Not necessarilyDaniel Bizó2009/08/14 03:53 AM
        new POWER7 info ..Thu Nguyen2009/08/25 04:05 AM
          new POWER7 info ..someone2009/08/25 06:47 AM
            new POWER7 info ..hobold2009/08/25 07:50 AM
              new POWER7 info ..G Webb2009/08/26 12:49 AM
            new POWER7 info ..mpx2009/08/25 08:36 AM
              new POWER7 info ..someone2009/08/25 09:16 AM
                new POWER7 info ..Jesper Frimann2009/08/27 09:18 AM
                  new POWER7 info ..Linus Torvalds2009/08/27 11:53 AM
                  new POWER7 info ..someone2009/08/27 01:00 PM
                    new POWER7 info ..a reader2009/08/27 04:21 PM
                      new POWER7 info ..David Kanter2009/08/27 09:32 PM
                        new POWER7 info ..a reader2009/08/28 08:45 AM
                    new POWER7 info ..hobold2009/08/28 05:00 AM
                      new POWER7 info ..someone2009/08/28 06:51 AM
                        new POWER7 info ..hobold2009/08/28 07:44 AM
                          new POWER7 info ..someone2009/08/28 08:10 AM
                        Non Autopar submissions for NehalemIlleglWpns2009/08/28 10:41 AM
                          Non Autopar submissions for NehalemDavid Kanter2009/08/28 11:07 AM
                          Non Autopar submissions for Nehalemsomeone2009/08/28 12:00 PM
          new POWER7 info ..mas2009/08/26 12:25 AM
            An EV8 lite? (NT)anon2009/08/26 09:21 AM
              An EV8 lite? => Piranha?M.2009/08/30 04:54 AM
            new POWER7 info ..Mark Roulo2009/08/27 06:51 AM
              new POWER7 info ..someone2009/08/27 07:03 AM
                new POWER7 info ..a reader2009/08/27 09:55 AM
                  new POWER7 info ..someone2009/08/27 11:58 AM
                    new POWER7 info ..a reader2009/08/27 04:11 PM
                      new POWER7 info ..Gabriele Svelto2009/08/28 12:17 AM
                      new POWER7 info ..someone2009/08/28 05:27 AM
                        new POWER7 info ..a reader2009/08/28 09:07 AM
                        OOOE for low powerDavid Kanter2009/08/28 11:15 AM
                          OOOE for low powersomeone2009/08/28 11:39 AM
                            OOOE for low powerDavid Kanter2009/08/28 01:55 PM
                              OOOE for low powerMark Roulo2009/08/28 03:16 PM
                                OOOE for low powerMark Roulo2009/08/28 03:44 PM
                                  Atom uarchDavid Kanter2009/08/28 08:19 PM
                                OOOE for low powerDavid Kanter2009/08/28 08:07 PM
                              OOOE for low powersomeone2009/08/28 04:18 PM
                                OOOE for low powerDavid Kanter2009/08/29 01:55 AM
                                  OOOE for low powersomeone2009/08/29 07:21 AM
                                    OOOE for low powera reader2009/08/29 09:14 AM
                                      OOOE for low powersomeone2009/08/29 09:56 AM
                                        OOOE for low powerDavid Kanter2009/08/29 10:08 AM
                                      OOOE for low powerMichael S2009/08/29 11:27 AM
                                        OOOE for low powera reader2009/08/29 04:50 PM
                                        OOOE for low poweranonymous2009/08/29 07:17 PM
                                          OOOE for low powerMichael S2009/08/30 12:07 AM
                                            OOOE for low powerJonathan Kang2009/09/01 05:44 AM
                                              OOOE for low powerMichael S2009/09/01 04:21 PM
                                                OOOE for low powerMark Roulo2009/09/01 05:53 PM
                                                  OOOE for low powerWilco2009/09/02 02:27 AM
                                                    OOOE for low powerMark Roulo2009/09/02 08:46 AM
                                                      OOOE for low powerWilco2009/09/02 04:52 PM
                                                    Define "emulate" (NT)Michael S2009/09/02 11:44 PM
                                                      Define "emulate"Wilco2009/09/03 12:33 AM
                                                        Define "emulate"none2009/09/03 04:46 AM
                                                          Define "emulate"Adrian2009/09/03 10:45 AM
                                                          Define "emulate"Wilco2009/09/03 02:20 PM
                                                            Define "emulate"none2009/09/03 10:41 PM
                                                              Define "emulate"Wilco2009/09/04 03:30 AM
                                                  low power ARM chipsMichael S2009/10/31 02:32 PM
                                                    low power ARM chipsGabriele Svelto2009/10/31 04:05 PM
                                                      low power ARM chipsMichael S2009/10/31 04:45 PM
                                                        low power ARM chipst2009/10/31 05:21 PM
                                    OOOE for low powerDavid Kanter2009/08/29 10:07 AM
                                      OOOE for low powersomeone2009/08/29 12:40 PM
                                        OOOE for low powera reader2009/08/29 05:03 PM
                                        OOOE for low poweranonymous2009/08/29 07:13 PM
                                          OOOE for low powersomeone2009/08/30 07:35 AM
                                            OOOE for low powerDavid Kanter2009/08/30 02:32 PM
                                            OOOE for low powerMatt Sayler2009/08/31 01:38 PM
                                        OOOE for low powerDavid Kanter2009/08/30 12:07 PM
                                    OOOE for low powerMichael S2009/08/29 11:44 AM
                                  TTMMichael S2009/08/29 12:24 PM
                                    TTMFoo_2009/08/29 01:40 PM
                                      TTMMichael S2009/08/29 02:10 PM
                                        TTManon2009/08/29 07:33 PM
                                          TTMJukka Larja2009/08/29 09:49 PM
                                            TTManon2009/08/30 06:07 AM
                                              TTMJukka Larja2009/08/30 09:31 PM
                                                Area, power and AtomDavid Kanter2009/08/30 10:36 PM
                                                  Area, power and AtomMichael S2009/08/31 12:18 AM
                                                    Area, power and Atoma reader2009/08/31 08:44 AM
                                                      Area, power and AtomMichael S2009/08/31 12:19 PM
                                                        Area, power and Atoma reader2009/08/31 02:53 PM
                                                          Area, power and Atomanonymous2009/08/31 04:17 PM
                                                        Area, power and AtomGabriele Svelto2009/08/31 03:41 PM
                                                          64-bit disabled AtomsFoo_2009/09/02 04:38 AM
                                                            64-bit disabled AtomsRobert David Graham2009/09/02 12:56 PM
                                                              64-bit disabled Atomsanon2009/09/02 02:14 PM
                                                              64-bit disabled Atomsanonymous2009/09/02 04:30 PM
                                                TTMMichael S2009/08/30 11:49 PM
                                                  TTMJukka Larja2009/08/31 11:23 PM
                                            TTMPaul2009/08/30 06:38 AM
                                            TTMPaul2009/08/30 06:40 AM
                                        TTMMark Roulo2009/08/30 09:50 AM
                                          TTMPaul2009/08/30 09:54 AM
                                            TTMMark Roulo2009/08/30 10:16 AM
                                        TTMFoo_2009/09/02 04:31 AM
                                  OOOE for low powerRob Thorpe2009/08/30 09:19 AM
                                OOOE for low powerMichael S2009/08/29 11:16 AM
                                  OOOE for low powerJukka Larja2009/08/29 09:40 PM
                                    OOOE for low powerMichael S2009/08/30 12:04 AM
                          OOOE and cache/mem sizesRichard Cownie2009/08/28 05:30 PM
                            OOOE and cache/mem sizesLinus Torvalds2009/08/31 10:53 PM
                              OOOE and cache/mem sizesRichard Cownie2009/09/01 04:15 AM
                                OOOE and pipe length etc.AM2009/09/01 08:35 AM
                                  OOOE and pipe length etc.Jouni Osmala2009/09/01 08:57 AM
                                    OOOE and clock rateAM2009/09/02 01:34 AM
                                      OOOE and clock rateJouni Osmala2009/09/02 05:35 AM
                                        OOOE and clock rateMartin Høyer Kristiansen2009/09/02 06:19 AM
                                          OOOE and clock rateanon2009/09/02 09:43 PM
                                        OOOE and clock rateAM2009/09/03 02:52 AM
                                          OOOE and clock rateJouni Osmala2009/09/03 07:34 AM
                                            OOOE impactsAM2009/09/04 02:04 AM
                                              OOOE impactsDavid Kanter2009/09/04 10:12 AM
                                              OOOE impactsJouni Osmala2009/09/06 12:16 PM
                                                OOOE impactsAM2009/09/07 03:47 AM
                                                  OOOE impactsMartin Høyer Kristiansen2009/09/07 06:03 AM
                                                    Does IBM lie about PPC603 being OoO chip?AM2009/09/08 03:13 AM
                                                      No, but...Michael S2009/09/08 07:05 AM
                                                        No, but...hobold2009/09/09 05:09 AM
                                                  OOOE impactsJS2009/09/07 06:34 AM
                                                    Are Sandpile and others wrong about 0.28 um?AM2009/09/08 03:12 AM
                                                    OOOE impactssomeone2009/09/08 06:43 AM
                                                  OOOE impactsJouni Osmala2009/09/07 07:48 AM
                                                    OOOE costsDavid Kanter2009/09/07 12:07 PM
                                                    OOOE impactsAM2009/09/08 03:11 AM
                                                      OOOE impactsJouni Osmala2009/09/10 01:53 AM
                                                        OOOE impactsAM2009/09/11 04:35 AM
                                                          OOOE impactsJouni Osmala2009/09/11 08:38 AM
                                                            OOOE impactsAM2009/09/12 05:06 AM
                                                              OOOE impactsJouni Osmala2009/09/12 11:36 PM
                                                                OOOE impactsAM2009/09/14 04:39 AM
                                                                  OOOE impactsJouni Osmala2009/09/14 06:18 AM
                                                                    if-ex distanceAM2009/09/15 05:16 AM
                                                                    small addendumAM2009/09/19 03:54 AM
                                                                      small addendumJouni Osmala2009/09/19 09:51 PM
                                                                        small addendumAM2009/09/20 06:54 AM
                                                                          small addendumJouni Osmala2009/09/20 01:16 PM
                                                                            small addendumThiago Kurovski2009/09/20 04:51 PM
                                                                              small addendumJouni Osmala2009/09/20 09:21 PM
                                                                                small addendumThiago Kurovski2009/09/21 06:59 AM
                                                                            small addendumAM2009/09/21 03:14 AM
                                                                              small addendumJukka Larja2009/09/21 10:21 PM
                                                                                small addendumAM2009/09/22 03:01 AM
                                                                                  small addendumJukka Larja2009/09/22 11:31 PM
                                                                                    small addendumAM2009/09/23 08:35 AM
                                                                                      small addendumJukka Larja2009/09/23 10:31 PM
                                                                                        small addendumAM2009/09/24 12:13 AM
                                                                                          OT metadiscussionJukka Larja2009/09/24 09:39 PM
                                                                                            OT metadiscussionAM2009/09/25 05:18 AM
                                                                                              Back to bitsMichael S2009/09/25 07:14 AM
                                                                                                Back to bitsThiago Kurovski2009/09/25 11:24 AM
                                                                                                  Back to bitsWilco2009/09/25 03:18 PM
                                                                                                    Back to bitsThiago Kurovski2009/09/26 09:12 AM
                                                                                                  Back to bitsMichael S2009/09/26 08:54 AM
                                                                                                    Back to bitsThiago Kurovski2009/09/26 09:05 AM
                                                                                                      Back to bitsMichael S2009/09/26 09:16 AM
                                                                                                Agree, with very minor change.Jouni Osmala2009/09/25 09:37 PM
                                                                                                Back to bitsAM2009/09/26 06:16 AM
                                                                                                  Back to bitsMichael S2009/09/26 09:13 AM
                                                                                              OT metadiscussionDavid Kanter2009/09/25 12:23 PM
                                                                                                OT metadiscussionAM2009/09/26 05:55 AM
                                                                                              OT metadiscussionJukka Larja2009/09/25 11:33 PM
                                                                                                OT metadiscussionAM2009/09/26 05:50 AM
                                                                                                  OT metadiscussionJukka Larja2009/09/27 02:16 AM
                                                                                                    OT metadiscussionMichael S2009/09/27 04:58 AM
                                                                                                      OT metadiscussionAM2009/09/28 04:07 AM
                                                                                                    OT metadiscussionAM2009/09/28 03:43 AM
                                                                                                      OT metadiscussionJukka Larja2009/09/29 12:45 AM
                                                                                                        OT metadiscussionAM2009/09/30 03:13 AM
                                                                                                          OT metadiscussionJukka Larja2009/10/01 01:34 AM
                                                                                                            OT metadiscussionAM2009/10/01 04:05 AM
                                                                                                              OT metadiscussionJukka Larja2009/10/02 12:38 AM
                                                                                                                OT metadiscussionAM2009/10/03 07:19 AM
                                                                                                                  OT metadiscussionJukka Larja2009/10/04 03:38 AM
                                                                                                                    OT metadiscussionAM2009/10/04 08:27 AM
                                                                                                                      OT metadiscussionJukka Larja2009/10/04 11:48 PM
                                                                                                                        OT metadiscussionAM2009/10/05 07:13 AM
                                                                                                                          About teachingJukka Larja2009/10/05 11:36 PM
                                                                                                                            About teachingAM2009/10/06 04:37 AM
                                                                                                                              About teachingJukka Larja2009/10/07 03:15 AM
                                                                                                                                About teachinganon2009/10/07 12:39 PM
                                                                                                                                About teachingAM2009/10/08 03:11 AM
                                                                                                                                  About teachingJukka Larja2009/10/09 04:10 AM
                                                                                                                                    About teachingAM2009/10/09 05:40 AM
                                                                                                                                      About teachingJukka Larja2009/10/09 09:02 PM
                                                                                                                                        About teachingAM2009/10/09 11:24 PM
                                                                                                                                          About teachingJukka Larja2009/10/10 10:50 PM
                                                                                                                                            About teachingAM2009/10/12 02:02 AM
                                                                                                                                              About teachingJukka Larja2009/10/12 10:51 PM
                                                                                                                                                About teachingAM2009/10/13 04:06 AM
                                                                                                                                                  About teachingJukka Larja2009/10/13 11:33 PM
                                                                                                                                                    About teachingAM2009/10/14 03:36 AM
                                                                                                                                                      About teachingJukka Larja2009/10/14 08:19 PM
                                                                                                                                                        About teachingAM2009/10/15 04:22 AM
                                                                                                                                          About teachingSalvatore De Dominicis2009/10/12 02:23 AM
                                                                                                                                            About teachingDean Kent2009/10/12 12:25 PM
                                                                                                                                              About teachingSalvatore De Dominicis2009/10/13 02:11 AM
                                                                                                OT metadiscussionSeni2009/09/26 06:26 AM
                                                                                                  OT metadiscussionWilco2009/09/26 08:08 AM
                                                                                                  OT metadiscussionJukka Larja2009/09/27 02:18 AM
                                                                                                    OT metadiscussionMichael S2009/09/27 05:12 AM
                                                                                          small addendumJouni Osmala2009/09/24 10:04 PM
                                                                                            small addendumAM2009/09/25 05:04 AM
                                                                                            extra stage in EV6AM2009/09/26 06:29 AM
                                                    PPC603 does OoOEhobold2009/09/08 05:40 AM
                                                  OOOE impactssomeone2009/09/08 05:39 AM
                                                    EV6AM2009/09/09 04:33 AM
                                      OOOE and clock rateSeni2009/09/02 09:11 AM
                                        OOOE and clock rateLinus Torvalds2009/09/02 06:48 PM
                                          OOOE and clock rateanon2009/09/02 11:55 PM
                                            OOOE and clock rateWilco2009/09/03 12:44 AM
                                              OOOE and clock rateJouni Osmala2009/09/03 01:02 AM
                                                OOOE and ItaniumAM2009/09/03 01:27 AM
                                                OOOE and clock rateMartin Høyer Kristiansen2009/09/03 03:41 AM
                                              OOOE and clock rateanon2009/09/03 01:12 AM
                                                OOOE and clock rateWilco2009/09/03 02:10 AM
                                            POWER6 skewed pipelinePaul A. Clayton2009/09/03 11:22 AM
                                              POWER6 skewed pipelineAnon42009/09/03 07:00 PM
                                          OOOE and clock rateMr. Camel2009/09/03 03:40 AM
                                          OOOE and clock rateRichard Cownie2009/09/03 06:42 AM
                                  OOOE and pipe length etc.Richard Cownie2009/09/01 09:01 AM
                                    OOOE and pipe length etc.AM2009/09/02 01:32 AM
                                      OOOE and pipe length etc.Richard Cownie2009/09/02 07:49 AM
                                        LRB choice of P54AM2009/09/03 01:40 AM
                                          LRB choice of P54Gian-Carlo Pascutto2009/09/03 01:45 AM
                                            LRB choice of P54AM2009/09/03 03:18 AM
                                              LRB choice of P54Gian-Carlo Pascutto2009/09/03 03:55 AM
                                                LRB choice of P54AM2009/09/03 04:28 AM
                                                  LRB choice of P54Gian-Carlo Pascutto2009/09/03 05:29 AM
                                                    Amount of cache per core matters,and mem bandwith too (NT)Jouni Osmala2009/09/03 07:44 AM
                                                    LRB choice of P54rwessel2009/09/03 02:31 PM
                                                    LRB choice of P54AM2009/09/04 02:24 AM
                                                  LRB choice of P54anon2009/09/03 06:40 AM
                                                    LRB choice of P54a reader2009/09/03 09:20 AM
                                                      LRB choice of P54anon2009/09/03 05:57 PM
                                                    LRB choice of P54Jonathan Kang2009/09/03 02:30 PM
                                                      LRB choice of P54David Kanter2009/09/03 04:38 PM
                                                        LRB choice of P54Jonathan Kang2009/09/04 08:16 AM
                                                      LRB choice of P54anon2009/09/03 06:07 PM
                                                        LRB choice of P54AM2009/09/04 02:20 AM
                                                        LRB choice of P54Jonathan Kang2009/09/04 08:13 AM
                                                          LRB choice of P54Dan Downs2009/09/04 08:38 AM
                                                            LRB choice of P54Dan Downs2009/09/05 04:36 AM
                                                              LRB choice of P54Anon2009/09/05 02:44 PM
                                                          LRB choice of P54AM2009/09/05 12:12 AM
                                                    LRB choice of P54AM2009/09/04 02:18 AM
                                                      LRB choice of P54anon2009/09/04 08:18 PM
                                                        LRB choice of P54AM2009/09/04 11:53 PM
                                                          LRB choice of P54anon2009/09/05 04:06 AM
                                                            LRB choice of P54AM2009/09/05 09:14 AM
                                                  LRB choice of P54 - Layout?Anonymous2009/09/03 02:40 PM
                                                    LRB choice of P54 - Layout?anonymous2009/09/03 03:54 PM
                                                  LRB choice of P54Jukka Larja2009/09/03 09:58 PM
                                                  LRB choice of P54mpx2009/09/04 04:07 AM
                                          LRB choice of P54anon2009/09/03 02:02 AM
                                        OOOE and pipe length etc.Gian-Carlo Pascutto2009/09/03 01:40 AM
                                      Larrabee: Pentium vs 486 vs 386Mark Roulo2009/09/03 04:26 PM
                                        Larrabee: Pentium vs 486 vs 386Michael S2009/09/03 05:14 PM
                                          Larrabee: Pentium vs 486 vs 386Mark Roulo2009/09/04 10:05 AM
                                            Larrabee: Pentium vs 486 vs 386Jonathan Kang2009/09/04 10:59 AM
                                            Larrabee: Pentium vs 486 vs 386Michael S2009/09/05 09:58 AM
                                            Larrabee: Pentium vs 486 vs 386James2009/09/07 03:15 AM
                                              Larrabee: Pentium vs 486 vs 386Mark Roulo2009/09/07 07:44 PM
                                      OOOE and pipe length etc.Michael S2009/09/03 05:42 PM
                                        LRB coreAM2009/09/04 02:09 AM
                                          LRB coreMichael S2009/09/04 05:07 AM
                                            LRB coreanon2009/09/04 08:27 PM
                                              LRB coreMichael S2009/09/05 10:12 AM
                                                LRB coreanon2009/09/05 11:03 PM
                                                  reasons for split I/D L1 cachesMichael S2009/09/06 04:10 AM
                                                    reasons for split I/D L1 cachesanon2009/09/06 06:32 AM
                                                      reasons for split I/D L1 caches?2009/09/06 10:35 AM
                                                        reasons for split I/D L1 cachesmegol2009/09/06 03:39 PM
                                                          reasons for split I/D L1 caches?2009/09/07 04:20 AM
                                                            reasons for split I/D L1 cachesanon2009/09/07 06:25 AM
                                                              cache hinting?2009/09/07 07:10 AM
                                                                cache hintinganon2009/09/07 07:35 AM
                                                                  cache hinting?2009/09/07 09:10 AM
                                                                    cache hintinganon2009/09/07 09:49 AM
                                                                      cache hinting?2009/09/07 10:37 AM
                                              Split and unified cachesDavid Kanter2009/09/06 01:38 PM
                                                Split and unified cachesanon2009/09/06 11:15 PM
                                                  Split and unified cachesMichael S2009/09/07 12:40 AM
                                                    Split and unified cachesanon2009/09/07 02:24 AM
                                                  Split and unified cachesDavid Kanter2009/09/07 12:51 AM
                                                    Split and unified cachesanon2009/09/07 02:13 AM
                                            LRB coreAM2009/09/05 12:08 AM
                                            LRB coreLinus Torvalds2009/09/05 10:47 AM
                                          LRB coreDavid Kanter2009/09/04 01:23 PM
                                            LRB coreAnon2009/09/04 06:32 PM
                                              LRB coreDavid Kanter2009/09/04 10:15 PM
                                              LRB coreMichael S2009/09/05 10:21 AM
                              OOOE and cache/mem sizesa reader2009/09/01 09:19 AM
                                OOOE and cache/mem sizesRichard Cownie2009/09/01 09:43 AM
                      snapdraon?Michael S2009/08/28 06:10 AM
                        snapdraon?a reader2009/08/28 08:51 AM
                          Thanks (NT)Michael S2009/08/29 12:53 PM
                        snapdraon?Paul2009/08/28 01:12 PM
              new POWER7 info ..EduardoS2009/08/27 03:41 PM
                new POWER7 info ..Jesper Frimann2009/08/28 05:03 AM
                  Single threaded performanceDavid Kanter2009/08/28 10:52 AM
  Hot Chips XXI Preview onlinehobold2009/08/13 07:30 AM
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How do you spell purple?