Date: Mon, 28 Nov 2005 23:05:57 -0800 From: Jason Evans <jasone@canonware.com> To: current@freebsd.org Subject: New libc malloc patch Message-ID: <B6653214-2181-4342-854D-323979D23EE8@canonware.com>
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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" .
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