Date: Wed, 19 Nov 2008 20:26:51 +0530 From: Channa <channa.kad@gmail.com> To: "Ivan Voras" <ivoras@freebsd.org> Cc: freebsd-current@freebsd.org Subject: Re: FreeBSD performance on single CPU. Message-ID: <515c64960811190656i5b103d15s44b0a35a6b9455e@mail.gmail.com> In-Reply-To: <gg18ob$gor$1@ger.gmane.org> References: <515c64960811190604w4f22e5a0ta4ed07323fcb697d@mail.gmail.com> <gg18ob$gor$1@ger.gmane.org>
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Hi, Thank you very much for your information. I am using current implementation of FreeBSD malloc. I am checking the performance on single CPU machine. I am using it in my own environment i am not using FreeBSD7.0. I disabled the MALLOC_DEBUG option in the malloc implementaton and checked the performance i see no difference the results are the same. ./mallco-test Starting test... Thread -1101005488 adjusted timing: 4.495931 seconds for 1000000 requests of 512 bytes. Could please tell me if anything else needs to be changed.? Thanks in Advance, Channa 2008/11/19 Ivan Voras <ivoras@freebsd.org>: > Channa wrote: >> Hi, >> >> I am using FreeBSD malloc from the current working branch. >> I hope its jemalloc. >> >> I tested it on a single CPU machine i could get the following results >> >> # ./malloc-test 1024 10000000 4 >> >> Starting test... >> Thread -1096811184 adjusted timing: 102.369100 seconds for 10000000 >> requests of 1024 bytes. >> Thread -1101005488 adjusted timing: 103.212512 seconds for 10000000 >> requests of 1024 bytes. >> Thread -1098908336 adjusted timing: 103.491399 seconds for 10000000 >> requests of 1024 bytes. >> Thread -1094714032 adjusted timing: 103.605124 seconds for 10000000 >> requests of 1024 bytes. >> >> I checked the result in the FreeBSD mailing list link given below: >> >> http://unix.derkeiler.com/Mailing-Lists/FreeBSD/current/2005-12/msg00294.html >> >> The jemalloc gives very good results. Is that the performance is good >> only on SMP? >> >> Or on single processor also it should perform well? >> >> But on single CPU i could see bad results. >> >> Could anyone help me out? > > Your message is not very clear but here are some things that might help you: > > 1) -CURRENT has debugging enabled both in kernel and in malloc. You need > to disable both before benchmarking anything. > 2) According to the post you linked, jemalloc should be 1.1 times faster > for single-threaded processes than phkmalloc, on that particular > benchmark. This benefit will probably also be visible on single-CPU > machines. > 3) You don't need to run -CURRENT to get jemalloc - it is also prosent > in 7.0. > >
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