linux-kernel - Re: SMP performance degradation with sysbench

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Message-ID: <45F74917.40806@cosmosbay.com>
Date:	Wed, 14 Mar 2007 02:00:07 +0100
From:	Eric Dumazet <dada1@...mosbay.com>
To:	Nish Aravamudan <nish.aravamudan@...il.com>
CC:	Anton Blanchard <anton@...ba.org>,
	Nick Piggin <nickpiggin@...oo.com.au>,
	Rik van Riel <riel@...hat.com>,
	Lorenzo Allegrucci <l_allegrucci@...oo.it>,
	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...e.hu>,
	Suparna Bhattacharya <suparna@...ibm.com>,
	Jens Axboe <jens.axboe@...cle.com>
Subject: Re: SMP performance degradation with sysbench

Nish Aravamudan a écrit :
> On 3/12/07, Anton Blanchard <anton@...ba.org> wrote:
>>
>> Hi Nick,
>>
>> > Anyway, I'll keep experimenting. If anyone from MySQL wants to help 
>> look
>> > at this, send me a mail (eg. especially with the sched_setscheduler 
>> issue,
>> > you might be able to do something better).
>>
>> I took a look at this today and figured Id document it:
>>
>> http://ozlabs.org/~anton/linux/sysbench/
>>
>> Bottom line: it looks like issues in the glibc malloc library, replacing
>> it with the google malloc library fixes the negative scaling:
>>
>> # apt-get install libgoogle-perftools0
>> # LD_PRELOAD=/usr/lib/libtcmalloc.so /usr/sbin/mysqld
> 
> Quick datapoint, still collecting data and trying to verify it's
> always the case: on my 8-way Xeon, I'm actually seeing *much* worse
> performance with libtcmalloc.so compared to mainline. Am generating
> graphs and such still, but maybe someone else with x86_64 hardware
> could try the google PRELOAD and see if it helps/hurts (to rule out
> tester stupidity)?

I wish I had a 8-way test platform :)

Anyway, could you post some oprofile results ?

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