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From: "Nish Aravamudan" <nish.aravamudan@gmail.com>
To: "Eric Dumazet" <dada1@cosmosbay.com>
Cc: "Anton Blanchard" <anton@samba.org>,
	"Nick Piggin" <nickpiggin@yahoo.com.au>,
	"Rik van Riel" <riel@redhat.com>,
	"Lorenzo Allegrucci" <l_allegrucci@yahoo.it>,
	linux-kernel@vger.kernel.org, "Ingo Molnar" <mingo@elte.hu>,
	"Suparna Bhattacharya" <suparna@in.ibm.com>,
	"Jens Axboe" <jens.axboe@oracle.com>
Subject: Re: SMP performance degradation with sysbench
Date: Tue, 13 Mar 2007 18:09:42 -0700	[thread overview]
Message-ID: <29495f1d0703131809i6f76e409q2c505a33f0b23a8d@mail.gmail.com> (raw)
In-Reply-To: <45F74917.40806@cosmosbay.com>

On 3/13/07, Eric Dumazet <dada1@cosmosbay.com> wrote:
> Nish Aravamudan a écrit :
> > On 3/12/07, Anton Blanchard <anton@samba.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 ?

Hopefully soon -- want to still make sure I'm not doing something
dumb. Am also hoping to get some of the gdb backtraces like Anton had.

Thanks,
Nish

  reply	other threads:[~2007-03-14  1:09 UTC|newest]

Thread overview: 45+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-02-25 17:44 SMP performance degradation with sysbench Lorenzo Allegrucci
2007-02-25 23:46 ` Rik van Riel
2007-02-26 13:36   ` Nick Piggin
2007-02-26 13:41     ` Nick Piggin
2007-02-26 22:04     ` Pete Harlan
2007-02-26 22:36       ` Dave Jones
2007-02-27  0:32         ` Hiro Yoshioka
2007-02-27  0:43           ` Rik van Riel
2007-02-27  4:03             ` Hiro Yoshioka
2007-02-27  4:31               ` Rik van Riel
2007-02-27  8:14                 ` J.A. Magallón
2007-02-27 14:02                   ` Rik van Riel
2007-02-27 14:56                     ` Paulo Marques
2007-02-27 20:40                       ` Nish Aravamudan
2007-02-28  2:21                       ` Bill Davidsen
2007-02-28  2:52                         ` Nish Aravamudan
2007-03-01  0:20                           ` Nish Aravamudan
2007-02-27 19:05                     ` Lorenzo Allegrucci
2007-03-01 16:57                       ` Lorenzo Allegrucci
2007-02-28  1:27     ` Nish Aravamudan
2007-02-28  2:22       ` Nick Piggin
2007-02-28  2:51         ` Nish Aravamudan
2007-03-12 22:00     ` Anton Blanchard
2007-03-13  5:11       ` Nick Piggin
2007-03-13  9:45         ` Andrea Arcangeli
2007-03-13 10:06           ` Nick Piggin
2007-03-13 10:31             ` Andrea Arcangeli
2007-03-13 10:37               ` Nick Piggin
2007-03-13 10:57                 ` Andrea Arcangeli
2007-03-13 11:12                   ` Nick Piggin
2007-03-13 11:40                     ` Eric Dumazet
2007-03-13 11:56                       ` Nick Piggin
2007-03-13 11:42                     ` Andrea Arcangeli
2007-03-13 12:02                       ` Eric Dumazet
2007-03-13 12:27                         ` Jakub Jelinek
2007-03-13 12:08                       ` Nick Piggin
2007-03-14 23:33                         ` Siddha, Suresh B
2007-03-20  2:29                           ` Zhang, Yanmin
2007-04-02  2:59                             ` Zhang, Yanmin
2007-03-13  6:00       ` Eric Dumazet
2007-03-14  0:36       ` Nish Aravamudan
2007-03-14  1:00         ` Eric Dumazet
2007-03-14  1:09           ` Nish Aravamudan [this message]
     [not found] <fa.V3M3ZgXL+lFlIyhx43YxCU/JFUk@ifi.uio.no>
     [not found] ` <fa.ciL5lzdfskdJHJPgn+UVCHt/9EM@ifi.uio.no>
     [not found]   ` <fa.2ABbHhyCbp3Fx7hSE/Gr0SuzFvw@ifi.uio.no>
     [not found]     ` <fa.oaZk6Aiqd8gyZNsj7+m+w9MibhU@ifi.uio.no>
     [not found]       ` <fa.RjX9Y4ckjRCle5L+uWNdd0snOio@ifi.uio.no>
     [not found]         ` <fa.XocsudxlGplKh0kloTtA0juPwtA@ifi.uio.no>
2007-02-28  0:20           ` Robert Hancock
2007-02-28  1:32             ` Hiro Yoshioka

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