Date: Thu, 17 Jul 2003 22:52:06 -0400 (EDT) From: Daniel Eischen <eischen@vigrid.com> To: Petri Helenius <pete@he.iki.fi> Cc: freebsd-threads@freebsd.org Subject: Re: thread scheduling priority with libkse Message-ID: <Pine.GSO.4.10.10307172249330.19331-100000@pcnet5.pcnet.com> In-Reply-To: <3F0A7425.9080300@he.iki.fi>
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On Tue, 8 Jul 2003, Petri Helenius wrote: > Daniel Eischen wrote: > > >The current thread. As I said before, if there are idle KSEs, then > >one is woken to run the newly runnable thread. > > > I'm seeing about 200 microsecond latency when scheduling the thread on > the other > KSE. Which translates to maximum of 2500 "spins" of the contested loop > a second. > > Same code runs about 500000 spins a second when no locking is involved. I just committed a change to libpthread so that preemption points are added when threads are made runnable after a mutex is released or a condition variable is signaled. You might try your test again with this change and see if it helps. -- Dan Eischenhelp
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