From: Paul Jackson <pj@sgi.com>
To: Marcel Zalmanovici <MARCEL@il.ibm.com>
Cc: kernel@kolivas.org, linux-kernel@vger.kernel.org, mulix@mulix.org
Subject: Re: Inconsistent timing results of multithreaded program on an SMP machine.
Date: Sun, 4 Dec 2005 11:54:46 -0800 [thread overview]
Message-ID: <20051204115446.0a026538.pj@sgi.com> (raw)
In-Reply-To: <OFF63E8FCE.68FFD508-ONC22570CD.0052EFE9-C22570CD.0054D27C@il.ibm.com>
Marcel wrote:
> I think that the conclusion from this test is that the write-back algorithm
> might be responsible for the oscillating results.
Well ... if you suspect your storage/hardware, then try a different
file system, such as network files or /dev/ramdisk.
It's a few seconds worth of difference you're dealing with, so try
playing around with printf's in the user code and printk's in the
kernel at key points in the sequence of events, so you can see what
happens when.
--
I won't rest till it's the best ...
Programmer, Linux Scalability
Paul Jackson <pj@sgi.com> 1.925.600.0401
next prev parent reply other threads:[~2005-12-04 19:55 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <OF507D27BA.6B51F19A-ONC22570C3.002E62D2-C22570C3.002F0C99@il.ibm.com>
2005-11-24 9:40 ` Inconsistent timing results of multithreaded program on an SMP machine Con Kolivas
2005-11-24 10:00 ` Marcel Zalmanovici
2005-11-24 12:43 ` Paul Jackson
2005-12-04 15:26 ` Marcel Zalmanovici
2005-12-04 19:54 ` Paul Jackson [this message]
2005-11-20 9:27 Marcel Zalmanovici
2005-11-20 9:54 ` Con Kolivas
2005-11-20 10:18 ` Marcel Zalmanovici
2005-11-20 10:28 ` Con Kolivas
2005-11-20 10:35 ` Muli Ben-Yehuda
2005-11-20 10:39 ` Con Kolivas
2005-11-20 10:43 ` Muli Ben-Yehuda
2005-11-20 10:50 ` Marcel Zalmanovici
2005-11-20 10:50 ` Con Kolivas
2005-11-20 10:43 ` Marcel Zalmanovici
2005-11-20 14:02 ` Paul Jackson
2005-11-24 9:50 ` Marcel Zalmanovici
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