PAPI in the ports
stas at FreeBSD.org
Fri Jun 22 10:28:25 UTC 2007
On Thu, 14 Jun 2007 13:27:01 +0200
Thomas Vogt <thomas at bsdunix.ch> 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
I'm using "options HWPMC_HOOKS" on heavily loaded web server almost
constantly, no visible penalty at all. Just my 2 cents.
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