Please help with Simon's Cyrus RPMS (2.2.8), SMP, and really slow performance

Sebastian Hagedorn Hagedorn at
Sat Jul 31 05:29:54 EDT 2004


-- mgrommet at is rumored to have mumbled on Samstag, 31. Juli 
2004 3:20 Uhr -0400 regarding Please help with Simon's Cyrus RPMS (2.2.8), 
SMP,  and really slow performance:

> I have two seperate machines... one very high end, dual CPU machine, raid
> 5, etc, the other is a piece of crud (standard low end workstation).
> Both machines are running Redhat Enterprise Server 3...
> the SMP machine is running the redhat 2.4.21-4.ELsmp stock kernel...
> the cheapie machine is running he redhat 2.4.21-4.EL stock kernel...
> On the cheap machine, performance is blazingly fast...
> an imtest generates a full test in 2-3 seconds.
> On the SMP machine, performance is horrendous...  taking ~27 seconds to
> generate the same test results.
> I've actually had the same problem on 2 completely different SMP machines
> running ES 3
> It should be noticed that cyrus works 100%, just slowly.  This same
> machine ran 2.0.16 very quickly for 2 years.
> I'm really hoping that someone has seen this problem, or can give me some
> ideas what to try, or what to look for.
> Are there any known problems with cyrus on SMP machines?  RedHat ES?

all I can think of is that we've had problems with RedHat AS 2.1 on 
machines with 8 GB of RAM. It happened quite often that the cache grew too 
large and then everything was very slow. A workaround for that was to cause 
the memory manager to flush the cache by allocating a lot of memory in a 
small program written for that purpose.

More recent kernel versions have improved memory management and I wouldn't 
have expected RH ES 3.0 to be affected. What does top tell you? Does the 
load get high? How much CPU time do the kernel tasks use up?
Sebastian Hagedorn M.A. - RZKR-R1 (Flachbau), Zi. 18, Robert-Koch-Str. 10
Zentrum für angewandte Informatik - Universitätsweiter Service RRZK
Universität zu Köln / Cologne University - Tel. +49-221-478-5587
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