The fragility of your argument

By: Paul (no.delete@this.thanks.com), May 16, 2007 3:01 pm
Room: Moderated Discussions
Vincent Diepeveen (diep@xs4all.nl) on 5/16/07 wrote:
---------------------------
>You just reserve 32MB ram for shared memory, any allocation bigger than that needs
>root permission. Very ugly from user viewpoint.

erm the maximum size of any shared memory segment and the total amount of shared memory is a tunable kernel parameter via /proc.

>Not many systems nowadays have just one core.

Almost all installed systems have one core. Most new systems have more than one core.

>you just see how every few seconds the processes swap from processor to processor,
>based upon the load of the processor.
>
>Very ugly.

No it's by design. It is a fundamentally hard problem to design a scheduler that can know if it is better to wait and restart a thread on the same core or to migrate it.

If you know better than the scheduler what's going on as you have some knowledge that you are running one thread per CPU for long periods of time then you can the sched_set_affinity() calls to tell tell the scheduler which core it is allowed to schedule a thread on.

>Just my own private opinion...

Most of these things you are complaining about which may appear to be simple and obvious on the surface are either fundamentally hard computer science problems or problems which are hard due to grotty underlying architecture that the OS is shielding you from.

If you want something which achieves your goals then read up about the problem and propose what algorithms could be used to solve the problem.

Failing that dispense with the OS entirely and just run DIEP as it's own OS...
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                        (i)AMD64Linus Torvalds05/09/07 12:29 PM
                          (i)AMD64Groo05/09/07 04:45 PM
                          TIFNAAanonymous05/09/07 05:49 PM
                            Inspired by FYR Macedonia? (NT)Michael S05/09/07 11:21 PM
                              More likely...rwessel05/10/07 12:39 AM
                            TIFNAAGabriele Svelto05/09/07 11:57 PM
                          (i)AMD64James05/10/07 02:27 AM
                        i86Dean Kent05/09/07 12:30 PM
                        (i)AMD64Max05/09/07 01:28 PM
                          wide86? long86?hobold05/10/07 05:05 AM
                            x87 perhaps, it is one more. :) (NT)Groo05/10/07 05:50 AM
                              x86+Dean Kent05/10/07 08:44 AM
                                Does it really matter?Doug Siebert05/10/07 09:10 AM
                                  let's stay with x86-64 for now, pleaseMarcin Niewiadomski05/10/07 11:50 AM
                                    let's stay with x86-64 for now, pleaseDean Kent05/11/07 06:11 AM
                                      let's stay with x86-64 for now, pleaserwessel05/11/07 02:46 PM
                                        let's stay with x86-64 for now, pleaseDean Kent05/11/07 06:03 PM
                                          let's stay with x86-64 for now, pleaseMichael S05/12/07 10:49 AM
                                            let's stay with x86-64 for now, pleaseDean Kent05/12/07 01:05 PM
                                              let's stay with x86-64 for now, pleaseMichael S05/12/07 01:25 PM
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                                                  let's stay with x86-64 for now, pleaseJasonB05/13/07 07:43 AM
                                                    client consolidationMichael S05/13/07 08:37 AM
                                                  let's stay with x86-64 for now, pleaseTzvetan Mikov05/13/07 03:44 PM
                                                let's stay with x86-64 for now, pleaserwessel05/14/07 02:42 PM
                                      What's your point?Doug Siebert05/11/07 02:56 PM
                                        What's your point?Linus Torvalds05/11/07 04:15 PM
                                          What's your point?Doug Siebert05/13/07 03:11 PM
                                            What's your point?Dean Kent05/13/07 07:04 PM
                                              What's your point?JasonB05/14/07 02:06 AM
                                                What's your point?Dean Kent05/14/07 07:20 AM
                                                  What's your point?JasonB05/14/07 04:35 PM
                                                  What's your point?JasonB05/14/07 07:35 PM
                                                    What's your point?Dean Kent05/14/07 08:12 PM
                                        What's your point?Dean Kent05/11/07 06:06 PM
                                        What's your point?Stephen H05/13/07 01:55 AM
                                          Why didn't MS take advantage of PAE?David W. Hess05/13/07 08:37 AM
                                            PAE sucks (Why didn't MS take advantage of PAE?)Linus Torvalds05/13/07 10:20 AM
                                              PAE sucks (Why didn't MS take advantage of PAE?)Dean Kent05/13/07 10:49 AM
                                              PAE sucks (Why didn't MS take advantage of PAE?)David W. Hess05/13/07 12:37 PM
                                              > 1 GB RAM on a 32-bit systemTzvetan Mikov05/13/07 01:44 PM
                                                > 1 GB RAM on a 32-bit systemS. Rao05/13/07 03:00 PM
                                                  > 1 GB RAM on a 32-bit systemTzvetan Mikov05/13/07 05:32 PM
                                                    > 1 GB RAM on a 32-bit systemS. Rao05/14/07 12:19 AM
                                                > 1 GB RAM on a 32-bit systemLinus Torvalds05/13/07 03:46 PM
                                                  > 1 GB RAM on a 32-bit systemTzvetan Mikov05/13/07 05:23 PM
                                                  > 1 GB RAM on a 32-bit systemJasonB05/13/07 06:37 PM
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                                                      Windows manages memory differentlyJasonB05/14/07 01:50 AM
                                                        Windows manages memory differentlyTzvetan Mikov05/14/07 08:56 AM
                                                          Windows manages memory differentlyrwessel05/14/07 03:40 PM
                                                            Windows manages memory differentlyDavid W. Hess05/14/07 04:07 PM
                                                              Windows manages memory differentlyrwessel05/14/07 04:51 PM
                                                            Windows manages memory differentlyTzvetan Mikov05/14/07 05:40 PM
                                                              Windows manages memory differentlyrwessel05/14/07 06:09 PM
                                                      Windows manages memory differentlyHoward Chu05/14/07 11:17 AM
                                                        Windows manages memory differentlyJukka Larja05/14/07 11:30 AM
                                                        Windows manages memory differentlyTzvetan Mikov05/14/07 01:54 PM
                                                          Windows manages memory differentlyHoward Chu05/15/07 03:35 AM
                                                            Windows manages memory differentlyGroo05/15/07 07:34 AM
                                                      Anyone know what OS X (10.4, Intel, desktop) does?Matt Sayler05/15/07 06:23 AM
                                                        Anyone know what OS X (10.4, Intel, desktop) does?Wes Felter05/15/07 08:37 AM
                                                        Anyone know what OS X (10.4, Intel, desktop) does?Anonymous05/15/07 10:49 AM
                                                        Anyone know what OS X (10.4, Intel, desktop) does?anon205/15/07 07:13 PM
                                              PAE sucks (Why didn't MS take advantage of PAE?)Paul05/13/07 03:40 PM
                                                PAE sucks (Why didn't MS take advantage of PAE?)Peter Arremann05/13/07 05:38 PM
                                                  PAE sucks (Why didn't MS take advantage of PAE?)Henrik S05/14/07 03:31 AM
                                              The fragility of your argumentslacker05/13/07 03:56 PM
                                                The fragility of your argumentnick05/13/07 05:42 PM
                                                The fragility of your argumentHoward Chu05/14/07 02:52 AM
                                                  The fragility of your argumentDean Kent05/14/07 09:19 AM
                                                The fragility of your argumentanon205/14/07 08:26 AM
                                                  The fragility of your argumentTzvetan Mikov05/14/07 09:01 AM
                                                  The fragility of your argumentDean Kent05/14/07 09:16 AM
                                                    The fragility of your argumentLinus Torvalds05/14/07 11:57 AM
                                                      The fragility of your argumentJasonB05/14/07 04:48 PM
                                                        The fragility of your argumentDean Kent05/14/07 07:36 PM
                                                          The fragility of your argumentRicardo B05/16/07 02:40 AM
                                                            The fragility of your argumentDean Kent05/16/07 03:32 AM
                                                              The fragility of your argumentRicardo B05/16/07 06:41 AM
                                                                PSRicardo B05/16/07 06:50 AM
                                                                The fragility of your argumentDean Kent05/16/07 09:07 AM
                                                                  Modern web browsingS. Rao05/16/07 09:16 AM
                                                                    Aha!Dean Kent05/16/07 09:27 AM
                                                                      Aha!Dean Kent05/16/07 09:32 AM
                                                                        Aha!S. Rao05/16/07 10:34 AM
                                                                  The fragility of your argumentRicardo B05/16/07 10:00 AM
                                                      The fragility of your argumentVincent Diepeveen05/16/07 10:10 AM
                                                        The fragility of your argumentPaul05/16/07 03:01 PM
                                                          The fragility of your argumentVincent Diepeveen05/17/07 03:05 AM
                                                    The fragility of your argumentanon205/15/07 01:35 AM
                                                    Splits vs page allocations?Matt Sayler05/15/07 07:33 AM
                                          What's your point?Michael S05/13/07 08:55 AM
                                            What's your point?anonymous05/13/07 11:08 AM
                                              What's your point?Michael S05/13/07 11:31 AM
                                      let's stay with x86-64 for now, pleaseJasonB05/13/07 07:16 AM
                                x864 =) (NT)some105/15/07 03:03 AM
    Rock/Tukwila rumorsIntelUser200005/06/07 02:27 PM
  Rock/Tukwila rumorsm05/13/07 08:05 AM
  Rock/Tukwila rumorsmas05/15/07 09:40 AM
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