[Linux-cluster] Load issues with GFS/Apache

[Duncan Morgan]

Thanks Michael.

-----Original Message-----
From: linux-cluster-bounces at redhat.com
[mailto:linux-cluster-bounces at redhat.com] On Behalf Of Michael Conrad Tadpol
Tilstra
Sent: Tuesday, November 09, 2004 11:39 AM
To: linux clistering
Subject: Re: [Linux-cluster] Load issues with GFS/Apache

On Tue, Nov 09, 2004 at 11:15:35AM -0800, Duncan Morgan wrote:
> Hello,
> 
> We have the following configuration
> 
> - 14 GFS nodes each with dual 2.4 GHz Xeon and 2 GB RAM
> - RHEL 3 with 2.4.21-20.ELsmp kernel
> - GFS 6.0.0-15
> - Apache 1.3.31 on each node 
> 
> The load on each server is consistently high (from 2 -->15) compared to
> Apache running on a standalone server. The processors are generally about
> 80% idle and lock_gulmd is always near the top of the 'top' output.
> 
> Has anybody else experienced this? Is it normal?
> 
> Thanks in advance.

yes, its normal. it is an artifact of how load averages are calculated
and that most of gfs and gulm in kernel space don't use interruptible
waits. (puts processes into the D state.)

-- 
Michael Conrad Tadpol Tilstra
I can resist anything but temptation.