I have a (couple of) client(s) that have performance problems across linux distirbutions. That is - they try an operation on a given platform with a given (redhat both cases) distribution, and get a certain performance. Then they try the same operation on the same hardware with a newer distribution, and get considerably lower performance.
In one case, the fast distro is RedHat 7.2, and the slow one is 9. In another I'm not sure what the fast one is, but the slow on is AS 3. I suspect that RedHat screwed something up with their newer kernels (perhaps something incorrectly backported from 2.6?).
So far, I have seen neither computers myself, and I only had chance to do repetitive "try this, what now?" with one of them over the phone. The problem is that nothing shows problems! The tasks seem almost unrelated. In one case it's copying stuff over the net to another computer (1:2 performance ratio), in another it's running ./configure (1:4 ratio). In both cases, there does not appear to be any clear-cut curlpit. In one case I asked the client to try out the 7.2 kernel with the 8 distribution, but I don't have the results in yet.
The questions:
a. Does anyone have a recommended benchmarking tool? I found this page (http://lbs.sourceforge.net/), but I'd really rather not start messing around with each and every one of those until I find the one I like. If anyone here has prior experience, I'd love it if you could share.
b. Occasionally, I get a system that responds "slow", but aside from a high load average, there seems to be nothing wrong with it. CPU is idle most of the time, etc. Any ideas how I can find out what and why is going on?
Many thanks,
Shachar
-- Shachar Shemesh Open Source integration & consulting Home page & resume - http://www.shemesh.biz/
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