[CentOS] how can I stress a server?

Filipe Brandenburger filbranden at gmail.com
Tue Nov 18 13:58:11 UTC 2008


Hi Rudi,

On Tue, Nov 18, 2008 at 02:13, Rudi Ahlers <rudiahlers at gmail.com> wrote:
> ...which can't take a lot of load...
> ...the machine sky rockets at some times...

The problem you have is that the Load Average is too high?

If that is indeed your problem, there is no way that this can be a
memory or CPU issue, since those would cause crashes and not high Load
Average.

If what you have is high Load Average, check this:
- Your machine has 8GB RAM. Are you using the 64-bit version of
CentOS? There would be an overhead in using a 32-bit PAE version on a
machine with more than 4GB, last time I tried it (some years ago) the
overhead was big enough to make a difference in the server's
performance.
- Your machine has SATA. If you don't use the correct SATA settings on
the BIOS, CentOS may use it in a backwards compatible mode and you
will not get enough performance out of it (see previous posts on
problems on SATA and on AHCI). If that's the case, changing the BIOS
settings might make a huge difference, but beware that if you do your
machine may no longer boot with the OS you installed right now. Better
thing to do would be to reinstall it once you found the right setting.

And next time, please state your problem clearly ("high Load Average")
instead of jumping the gun and saying you have a CPU or RAM issue
which does not seem to be the case here.

HTH,
Filipe


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