Date: Fri, 22 Jun 2007 14:03:17 +0400 From: Stanislav Sedov <stas@FreeBSD.org> To: Thomas Vogt <thomas@bsdunix.ch> Cc: NOC Meganet <tec@mega.net.br>, freebsd-performance@freebsd.org Subject: Re: PAPI in the ports Message-ID: <20070622140317.b2c8075e.stas@FreeBSD.org> In-Reply-To: <46712605.5090907@bsdunix.ch> References: <d825e0270706140152j6012592ah18beef95942bb051@mail.gmail.com> <4671118D.1040404@bsdunix.ch> <200706140806.05674.tec@mega.net.br> <46712605.5090907@bsdunix.ch>
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--Signature=_Fri__22_Jun_2007_14_03_17_+0400_AQkMawPt0S/Y6Y1K Content-Type: text/plain; charset=US-ASCII Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Thu, 14 Jun 2007 13:27:01 +0200 Thomas Vogt <thomas@bsdunix.ch> mentioned: >=20 > 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. >=20 > 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. >=20 I'm using "options HWPMC_HOOKS" on heavily loaded web server almost constantly, no visible penalty at all. Just my 2 cents. --=20 Stanislav Sedov ST4096-RIPE --Signature=_Fri__22_Jun_2007_14_03_17_+0400_AQkMawPt0S/Y6Y1K Content-Type: application/pgp-signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.4 (FreeBSD) iD8DBQFGe55uK/VZk+smlYERAuChAJ9bGF/MFT8ONwrs1L4Xp+9eTAbUOwCdHjR3 rkMpuP5LQgG9C4EOhcdaP94= =brFL -----END PGP SIGNATURE----- --Signature=_Fri__22_Jun_2007_14_03_17_+0400_AQkMawPt0S/Y6Y1K--
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