From: Daniel Phillips <phillips@innominate.de>
To: Joe deBlaquiere <jadb@redhat.com>, linux-kernel@vger.kernel.org
Subject: Re: more on scheduler benchmarks
Date: Wed, 24 Jan 2001 13:29:14 +0100 [thread overview]
Message-ID: <3A6ECA9A.AD9200E7@innominate.de> (raw)
In-Reply-To: <20010122101738.B7427@w-mikek.des.sequent.com> <3A6CEB02.3050906@redhat.com>
Joe deBlaquiere wrote:
>
> Maybe I've been off in the hardware lab for too long, but how about
>
> 1. using ioperm to give access to the parallel port.
> 2. have your program write a byte (thread id % 256 ?) constantly to the
> port during it's other activity
> 3. capture the results from another computer with an ecp port
>
> This way you don't run the risk of altering the scheduler behavior with
> your logging procedure.
It's a technique I've used in debugging realtime systems. It works
great, but bear in mind that the out to the parallel port costs an awful
lot of cycles. You *will* alter the behaviour of\x13 the scheduler.
--
Daniel
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next prev parent reply other threads:[~2001-01-24 12:32 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-01-22 18:17 more on scheduler benchmarks Mike Kravetz
2001-01-22 18:37 ` Davide Libenzi
2001-01-23 2:22 ` Joe deBlaquiere
2001-01-24 12:29 ` Daniel Phillips [this message]
-- strict thread matches above, loose matches on Subject: below --
2001-01-22 20:07 [Lse-tech] " Bill Hartner
2001-01-23 12:45 ` Andrew Morton
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