Re: [OT] linux 3.10 kernel will improve ipc,sysv semaphore scalability

От: Andrea Suisani
Тема: Re: [OT] linux 3.10 kernel will improve ipc,sysv semaphore scalability
Дата: ,
Msg-id: 51949D0B.6030000@opinioni.net
(см: обсуждение, исходный текст)
Ответ на: Re: [OT] linux 3.10 kernel will improve ipc,sysv semaphore scalability  (Shaun Thomas)
Список: pgsql-performance


Hi all,

On 03/26/2013 07:59 PM, Shaun Thomas wrote:
> On 03/26/2013 08:04 AM, Andrea Suisani wrote:
>
>> TPS:
>> 100 users: 1257.21 (vanilla)    2805.06 (v3 patchset)
>> 400 users: 1437.57 (vanilla)    2664.67 (v3 patchset)
>> 800 users: 1236.89 (vanilla)    2750.73 (v3 patchset)
>
> Wow, I like the look of that. I wonder how this reacts with disabled autogrouping and increasing
sched_migration_cost.If the completely fair scheduler has less locking contention with this patch-set, those tweaks may
noteven be necessary. I need to see if I can find a system to test on. 
>


still no time to do proper testing but I just want to inform that the
patchset actually went in the 3.10 first release candidate, as we can see
from git log :)


git log v3.9..v3.10-rc1 --grep="ipc,sem: fine grained locking for semtimedop" -- ipc/sem.c

commit 6062a8dc0517bce23e3c2f7d2fea5e22411269a3
Author: Rik van Riel <>
Date: Tue Apr 30 19:15:44 2013 -0700

ipc,sem: fine grained locking for semtimedop

...





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