Date: Sun, 29 Oct 2006 10:54:46 -0700 From: Scott Long <scottl@samsco.org> To: Daniel Eischen <deischen@freebsd.org> Cc: Paul Allen <nospam@ugcs.caltech.edu>, freebsd-current@freebsd.org, Robert Watson <rwatson@freebsd.org>, David Xu <davidxu@freebsd.org>, Julian Elischer <julian@elischer.org> Subject: Re: Comments on the KSE option Message-ID: <4544EAE6.2030406@samsco.org> In-Reply-To: <Pine.GSO.4.64.0610290845150.17696@sea.ntplx.net> References: <45425D92.8060205@elischer.org> <200610281132.21466.davidxu@freebsd.org> <20061028105454.S69980@fledge.watson.org> <20061028194125.GL30707@riyal.ugcs.caltech.edu> <20061028204357.A83519@fledge.watson.org> <200610290344.k9T3itAw054920@apollo.backplane.com> <Pine.GSO.4.64.0610290048530.15683@sea.ntplx.net> <4544380E.4010604@samsco.org> <Pine.GSO.4.64.0610290845150.17696@sea.ntplx.net>
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Daniel Eischen wrote: > On Sat, 28 Oct 2006, Scott Long wrote: > >> Daniel Eischen wrote: >>> Actually, that's not quite true. I assume you know the thing you >>> left out: system scope threads compete against all the other >>> system scope threads in the system (from all applications, not >>> just within one application). >>> >> >> All this debate about the merits of process scope threads and fair >> scheduling is great. But tell me, who was working on making this stuff >> work well quickly and reliably (i.e. work well)? No one! I don't care >> what AIX or Solaris or what else may or may not have done, who was >> making this work well for FreeBSD? Having a slow a thread subsystem is >> a serious detriment, no matter how nice and flexible it looks on paper. > > Process scope threads work well in libpthread. System scope > threads work well and fast in libthr. I think most people's > concept of "fast" as applied to process scope threads doesn't > quite mesh well with the fact that process scheduling is fair. > Btw, why is PTHREADS_INVARIANTS still enabled on -STABLE branches? We don't have kernel INVARIANTS enabled there, so I don't understand why libpthread needs to be different. Scott
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