Re: PAPI in the ports

On Thu, 14 Jun 2007 13:27:01 +0200
Thomas Vogt <thomas@xxxxxxxxxx> mentioned:


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.


I'm using "options HWPMC_HOOKS" on heavily loaded web server almost
constantly, no visible penalty at all. Just my 2 cents.

--
Stanislav Sedov
ST4096-RIPE

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