Re: 2.4.21 opteron 32 Gig RAM has 10k block writes/sec on running posgresql 7.4.6 disk i/o intensive app
From: Paramveer Singh
Date: Thu Dec 23 2004 - 07:03:54 EST
the update seems to have worked and the same situation has not arisen again.
On Wed, 22 Dec 2004 23:07:57 -0800, William Lee Irwin III
> On Thu, Dec 23, 2004 at 12:26:48PM +0530, Paramveer Singh wrote:
> > we are using a RedHat AS3 U3 box (2.4.21-4.ELsmp) to run a very
> > intensive database app which does a _huge_ number of inserts durnig
> > the data generation phase. However, we are noticing a unexpected
> > performance drops with user cpu utilization numbers falling to near 0.
> > most of the cpu is used up in iowait.
> > CPU states: cpu user nice system irq softirq iowait idle
> > total 2.0% 0.0% 7.6% 0.0% 0.0% 362.4% 27.2%
> > /proc/slabinfo showed huge numbers in buffer_head. The line was:
> > buffer_head 4908452 4962249 200 260854 261171 1 : 16000 4000
> Please try to reproduce on a more recent RHEL3, e.g. RHEL3-U4 released
> -- wli
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