Date: Mon, 26 Feb 2007 23:15:27 +0100 From: Divacky Roman <xdivac02@stud.fit.vutbr.cz> To: Kris Kennaway <kris@obsecurity.org> Cc: smp@freebsd.org, hackers@freebsd.org, current@freebsd.org Subject: Re: Progress on scaling of FreeBSD on 8 CPU systems Message-ID: <20070226221527.GA59969@stud.fit.vutbr.cz> In-Reply-To: <20070224213111.GB41434@xor.obsecurity.org> References: <20070224213111.GB41434@xor.obsecurity.org>
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On Sat, Feb 24, 2007 at 04:31:11PM -0500, Kris Kennaway wrote: > Now that the goals of the SMPng project are complete, for the past > year or more several of us have been working hard on profiling FreeBSD > in various multiprocessor workloads, and looking for performance > bottlenecks to be optimized. > > We have recently made significant progress on optimizing for MySQL > running on an 8-core amd64 system. The graph of results may be found > here: > > http://www.freebsd.org/~kris/scaling/scaling.png > > This shows the graph of MySQL transactions/second performed by a > multi-threaded client workload against a local MySQL database with > varying numbers of client threads, with identically configured FreeBSD > and Linux systems on the same machine. > > The test was run on FreeBSD 7.0, with the latest version of the ULE > 2.0 scheduler, the libthr threading library, and an uncommitted patch > from Jeff Roberson [1] that addresses poor scalability of file > descriptor locking (using a new sleepable mutex primitive); this patch > is responsible for almost all of the performance and scaling > improvements measured. It also includes some other patches (collected > in my kris-contention p4 branch) that have been shown to help > contention in MySQL workloads in the past (including a UNIX domain > socket locking pushdown patch from Robert Watson), but these were > shown to only give small individual contributions, with a cumulative > effect on the order of 5-10%. I wonder if anyone measured what effect superpages has on mysql performance... this should not help scaling but I can imagine it has some effect.
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