Date: Tue, 29 Nov 2005 03:37:32 -0800 From: Maxim Sobolev <sobomax@portaone.com> To: Jason Evans <jasone@canonware.com> Cc: current@FreeBSD.ORG Subject: Re: New libc malloc patch Message-ID: <438C3D7C.3000704@portaone.com> In-Reply-To: <B6653214-2181-4342-854D-323979D23EE8@canonware.com> References: <B6653214-2181-4342-854D-323979D23EE8@canonware.com>
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Just curious what is the grand plan for this work? I wonder if it will make sense to have two malloc's in the system, so that user can select one which better suits his needs. -Maxim Jason Evans wrote: > There is a patch that contains a new libc malloc implementation at: > > http://www.canonware.com/~jasone/jemalloc/jemalloc_20051127a.diff > > This implementation is very different from the current libc malloc. > Probably the most important difference is that this one is designed with > threads and SMP in mind. > > The patch has been tested for stability quite a bit already, thanks > mainly to Kris Kennaway. However, any help with performance testing > would be greatly appreciated. Specifically, I'd like to know how well > this malloc holds up to threaded workloads on SMP systems. If you have > an application that relies on threads, please let me know how > performance is affected. > > Naturally, if you notice horrible performance or ridiculous resident > memory usage, that's a bad thing and I'd like to hear about it. > > Thanks, > Jason > > === Important notes: > > * You need to do a full buildworld/installworld in order for the patch > to work correctly, due to various integration issues with the threads > libraries and rtld. > > * The virtual memory size of processes, as reported in the SIZE field by > top, will appear astronomical for almost all processes (32+ MB). This > is expected; it is merely an artifact of using large mmap()ed regions > rather than sbrk(). > > * In keeping with the default option settings for CURRENT, the A and J > flags are enabled by default. When conducting performance tests, > specify MALLOC_OPTIONS="aj" . > > _______________________________________________ > freebsd-current@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-current > To unsubscribe, send any mail to "freebsd-current-unsubscribe@freebsd.org" > > >
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