Date: Mon, 17 Feb 2003 16:27:24 -0800 From: "Sam Leffler" <sam@errno.com> To: "Matthew Dillon" <dillon@apollo.backplane.com>, "Bosko Milekic" <bmilekic@unixdaemons.com> Cc: "Andrew Gallatin" <gallatin@cs.duke.edu>, <freebsd-arch@FreeBSD.ORG> Subject: Re: mb_alloc cache balancer / garbage collector Message-ID: <019101c2d6e4$828cd370$52557f42@errno.com> References: <20030216213552.A63109@unixdaemons.com> <15952.62746.260872.18687@grasshopper.cs.duke.edu> <20030217095842.D64558@unixdaemons.com> <200302171742.h1HHgSOq097182@apollo.backplane.com> <20030217154127.A66206@unixdaemons.com> <200302180000.h1I00bvl000432@apollo.backplane.com>
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> By creating a thread you are introducing more moving parts, and like
> a physical system these moving parts are going to ineract with each
> other. Remember, the VM system is *already* trying to ensure that
> enough free pages exist in the system. If you have a second thread
> eating memory in large globs it is far more likely that you will
> destabilize the pageout daemon and create an oscillation between the
> two threads (pageout daemon and your balancer).
Good point. Trying to reason about the behaviour of the system w/ two (or
more) threads trying to do the same/similar work is too hard.
Sam
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