New libc malloc patch

From: Jason Evans (jasone_at_canonware.com)
Date: 11/29/05

  • Next message: Olivier Regnier: "Acer Aspire 3002WLMI - DVDRW" 
    To: current@freebsd.org
Date: Mon, 28 Nov 2005 23:05:57 -0800

    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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  • Next message: Olivier Regnier: "Acer Aspire 3002WLMI - DVDRW"

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    • Re: New libc malloc patch
      ... > There is a patch that contains a new libc malloc implementation at: ... > This implementation is very different from the current libc malloc. ... > well this malloc holds up to threaded workloads on SMP systems. ... > memory usage, that's a bad thing and I'd like to hear about it. ...
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    • Re: New libc malloc patch
      ... > There is a patch that contains a new libc malloc implementation at: ... > This implementation is very different from the current libc malloc. ... > this malloc holds up to threaded workloads on SMP systems. ... > memory usage, that's a bad thing and I'd like to hear about it. ...
      (freebsd-current)