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Re: Poor performance on Solaris

--On Thursday, February 24, 2011 3:53 PM +0100 Juergen.Sprenger@swisscom.com wrote:


we had some performance issues on our ldap servers running Solaris 10

I did some tests using slamd http://www.slamd.com/ and got disturbing

ldap-service: OpenLDAP 2.4.23, setup identical on both boxes, threads=64,
identical content.

hardware: Sun Microsystems  sun4v SPARC Enterprise T5120
memory:32 GB RAM
os: Solaris 10 s10s_u9wos_14a
searches (avg/second): 1521

Slowaris is always tedious with OpenLDAP. At a previous job, I was able to replace 9 slowaris boxes with 4 linux boxes, and even then, just one of the Linux boxes could handle the complete load it took the 9 slowaris boxes to run.

I will note that if you are going to use slowaris, I highly advise you set a memory key rather than using on disk cache for BDB if your DB is any size over about 4 GB. Other than that, you'll generally just have to deal with the fact it will be significantly slower than Linux.

Some time ago, I did benchmarks of Linux 2.6 vs Slowaris-x86 on identical hardware, and it still was noticeably slower, although not as bad as when using the sparc architecture.



Quanah Gibson-Mount
Sr. Member of Technical Staff
Zimbra, Inc
A Division of VMware, Inc.
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