Messages in this thread | | | Date | Mon, 17 Aug 2009 15:02:48 +0200 | From | Manfred Spraul <> | Subject | Re: [PATCH] [patch 4a/4] ipc: sem optimise simple operations |
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On 08/17/2009 08:44 AM, Nick Piggin wrote: > OK, well let's just get something in. > Good, I would propose the that the following 7 patches should be merged:
http://lkml.org/lkml/2009/8/11/59 http://lkml.org/lkml/2009/8/11/9 http://lkml.org/lkml/2009/8/11/14 http://lkml.org/lkml/2009/8/15/163 http://lkml.org/lkml/2009/8/15/164 http://lkml.org/lkml/2009/8/15/167 http://lkml.org/lkml/2009/8/15/168
Nick: is that ok from your point of view?
> That said, I'm not too unhappy with your version if you feel strongly > about it. I would prefer it: We simply don't know if a wait-for-zero list, only for single sop operations, is a step in the right direction.
Postgres uses single sop operations with just +-1 on one semaphore. You wrote that your SAP workload also uses +-1. According to google codesearch, apache, mozilla, mpich all use +-1.
Thus: Who uses single sop, wait for zero? I'm just afraid that we optimize for the wrong case.
-- Manfred
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