Message-ID: <074301c561ed$a61e1560$8300000a@johnpaul>
From: "johnpaul" <johnpaulmp@amiindia.co.in>
References: <4295B7F7.9060802@hp.com>
Subject: Re: [linux-lvm] Daemon or Thread with 5 minute interval
Date: Thu, 26 May 2005 17:52:52 +0530
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To: howard.rifkin@hp.com, LVM general discussion and development <linux-lvm@redhat.com>

Hi

Can you find the new process's name by getting the ps ax command  or Stop
the crond and see what happens

Regards
John

----- Original Message ----- 
From: "Howard Rifkin" <howard.rifkin@hp.com>
To: <linux-lvm@redhat.com>
Sent: Thursday, May 26, 2005 5:20 PM
Subject: [linux-lvm] Daemon or Thread with 5 minute interval


> I have been working on a project that analyzes "noise" in Linux clusters
> running large parallel jobs. Where noise is caused by daemons or kernel
> threads periodically waking up and slowing down a process of a parallel
> job enough so that is misses a rendezvous with the other processes and
> so slows down the entire job. Using an internal tool I have been able to
> track down several daemons that have been a large source of noise but,
> after turning them all off I am left with a large noise spike that
> occurs every 5 minutes. I have tried turning off most of the most common
> daemons such as cron, ntp, syslog, ect. but, I am still left with this
> spike. Not being a kernel expert myself I have not been able to
> experiment with kernel threads. So, my question is does anyone know of a
> kernel thread or daemon in the 2.4 kernel that wakes up every 5 minutes?
>
> Thanks
>
> Howard
>
>
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