Author: Gian-Carlo Pascutto
Date: 01:15:49 09/19/03
Go up one level in this thread
On September 18, 2003 at 19:06:54, Eugene Nalimov wrote: >>>>>No there isn't, because for single and dual machines, the NUMA issue can >>>>>pretty well be ignored >>>> >>>>Ignored? You _will_ get a performance handicap if you do so. >>>> >>>>-- >>>>GCP >>> >>>Yes, but on a dual it is a _minimal_ handicap. >> >>Last week, this 'minimal' handicap was enough to require a special >>version of Crafty. Now it's not needed for the Linux kernel? Uhh... > >I believe you never participated in a *huge* software project. [irrelevant blabla] >And so on, and so on... This is all fine and dandy, but it has absolutely nothing to do with the discussion at hand. Bob has been going on for a week about how he was going to make Crafty NUMA because that last 10% (or less) was so important, that it certainly _couldn't_ be ignored. Now he's saying the exact same thing is irrelevant, and the Linux kernel people can ignore it. I realize all too well the Linux kernel is a bigger project, but it's also got quite a few more people working on it, quite a few more testers, and quite a few more users than Crafty NUMA will ever have. For Crafty, that last 10% is so important, but for a project that's used by 1000x of times more users, it's irrevelant? That just makes no sense! Whether or not it takes a lot of work is completely irrevelant. This discussion is about whether you can ignore the small speed advantage or not. Of course it'll take a while to implement and bring problems! But do you _have_ to do the effort or not? The real world (in case the Linux people) seem to disagree with you as well, because they're quite well aware of their problems with NUMA architectures as simple as the Opterons and _are_ working to improve the support. There will be a lot of Linux servers running on Opterons and having a performance handicap as compared to Windows boxen in that regard is not something that is acceptable for them. -- GCP
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