Re: PAPI in the ports

Hi

NOC Meganet wrote:
On Thursday 14 June 2007 06:59:41 Thomas Vogt wrote:
Hi

Thats sounds nice. You wrote "The goal of the PmcTools project is to
provide FreeBSD's developers and system administrators with
non-intrusive, low-overhead and innovative ways of measuring and
analysing system performance" your website. Have you ever measured the
performance impact of such tools?

I'm interested to run such tool on production machines in the future but
only if the performance impact isn't that high.


Hi
... even if the tool (whatever it is) does not require much system resources
it triggers processes in order to measure their or the system's performance.
So long as you do not push the system to or over the edge you might not get
valuable numbers. So I mean, any performance measuring does or must stress
the system. That is at least my understanding. So probably running
performance tests on a production server is not the very best idea.

Yes you're right. But to have a such feature on a production system is
nice if you have to debug issues. If I get a problem I can easily debug
it without to simulate everything in the lab. It's not that I want to
run such features 24/7.

But perhaps "options HWPMC_HOOKS" in the kernel enables some hooks which
could cause performance penalties even if I don't actively use such
feature very often. Like many other debug options in the kernel. I don't
know.

Regards,
Tom
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