Date: Wed, 26 Dec 2007 02:51:39 -0500 (EST) From: Daniel Eischen <deischen@freebsd.org> To: David Xu <davidxu@freebsd.org> Cc: Brian McGinty <brian.mcginty@gmail.com>, Robert Watson <rwatson@freebsd.org>, arch@freebsd.org Subject: Re: Linux compatible setaffinity. Message-ID: <Pine.GSO.4.64.0712260250140.14817@sea.ntplx.net> In-Reply-To: <47707EA2.8010002@freebsd.org> References: <20071219211025.T899@desktop> <476B1973.6070902@freebsd.org> <20071222183700.L5866@fledge.watson.org> <476F0EE5.1040404@freebsd.org> <601bffc40712241909t10e6f3k8e7940d387b6efc2@mail.gmail.com> <47707EA2.8010002@freebsd.org>
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On Tue, 25 Dec 2007, David Xu wrote: > Brian McGinty wrote: >> On Dec 23, 2007 5:44 PM, David Xu <davidxu@freebsd.org> wrote: >>> Robert Watson wrote: >>>> On Fri, 21 Dec 2007, David Xu wrote: >>>> >>>>> I don't say no to these interfaces, but there is a need to tell user >>>>> which cpus are sharing cache, or memory distance is closest enough, >>>>> and which cpus are servicing interrupts, e.g, network interrupt and >>>>> disks etc, etc, otherwise, blindly setting cpu affinity mask only can >>>>> shoot itself in the foot. >>>> While the Mac OS X API is pretty Mach-specific, it's worth taking a look >>>> at their recently-announced affinity API: >>>> >>>> http://developer.apple.com/releasenotes/Performance/RN-AffinityAPI/index.html >>>> >>>> >>>> Robert N M Watson >>>> Computer Laboratory >>>> University of Cambridge >>>> >>> >>> I like the interfaces, it is more flexible. >> >> I agree. May I as k what's being planned? It's Jeffs' call finally I think. >> >> Brian. > > I don't have plan. ;-) If I understand it correctly, it is a hint to > scheduler, it is better describing thread relationship, while Jeff's > interface is a hard cpu binding interface, it is still needed in some > circumstance. Please take a look at Solaris' API for processor set binding: http://docs.sun.com/app/docs/doc/816-5167/6mbb2jae6?a=expand See processor_bind, processor_info, and pset_*. -- DE
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