From: mdaljeet@in.ibm.com
To: linux-kernel@vger.kernel.org
Message-ID: <CA256A9A.0054342C.00@d73mta01.au.ibm.com>
Date: Tue, 31 Jul 2001 20:48:18 +0530
Subject: scheduling problem
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Sender: linux-kernel-owner@vger.kernel.org
Original-Recipient: rfc822;linux-kernel-outgoing

Hi,

I have a apple G4 machine that is dual processor and running SMP kernel. On
the lines of a patch I ceated a module that I use to bind a process to a
processor.

My program creates multiple threads and there are multiple instances of
program running at same time. All the threads/processes are binded to a
single processor. If I boot my machine in non-SMP kernel and run all the
instances of my program, everything works fine. But if I boot my machine in
SMP kernel and run all the instances of my program, I get a timeout
condition from one of the threads regularly but at random intervals of
time. After adding a lot of debugging statements, most probably it scales
down to scheduling problem. I added 'sleep(1)' in all the threads that are
created and everything worked fine. Are there any other methods to debug?
How can I find out the time intervals during which a process was scheduled
out and on which processor it ran on during its lifetime?

Regards,
Daljeet.


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