From: David Mosberger <davidm@napali.hpl.hp.com>
To: Rick Haines <rick@kuroyi.net>
Cc: linux-kernel@vger.kernel.org
Subject: Re: read latency (ia64)
Date: Fri, 19 Apr 2002 14:13:05 -0700 [thread overview]
Message-ID: <15552.34913.686564.487970@napali.hpl.hp.com> (raw)
In-Reply-To: <20020418140622.GA31405@sasami.kuroyi.net>
>>>>> On Thu, 18 Apr 2002 10:06:22 -0400, Rick Haines <rick@kuroyi.net> said:
Rick> I have a Lion with 4 666mhz B3 stepping cpus and 4GB ram
Rick> running Debian unstable with kernel 2.4.18 and the 020410 ia64
Rick> patch (I have the same problem with 2.4.9-itanium-smp from the
Rick> archive).
Rick> I have a program that reads large files in increments of 81920
Rick> blocks. After about 9600 read calls I get about a dozen reads
Rick> that take about 3 seconds each. Does anyone have any ideas as
Rick> to a cause/solution? (I have 4 other threads working/possibly
Rick> writing output at the same time, although in this case only 1
Rick> of them would be active at the same time). I am also running
Rick> a program that callocs almost all my ram to make sure none of
Rick> the file is cached.
I don't think anyone will be able to help you without a test case.
Do you have a minimal test case that reproduces the problem?
--david
next prev parent reply other threads:[~2002-04-19 21:13 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-04-18 14:06 Rick Haines
2002-04-19 21:13 ` David Mosberger [this message]
2002-04-19 22:10 ` Rick Haines
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