Re: read latency (ia64)

David Mosberger (davidm@napali.hpl.hp.com)
Fri, 19 Apr 2002 14:13:05 -0700


>>>>> 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
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