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Commits on Feb 23, 2008
  1. @ageric @gitster

    pack-objects: Add runtime detection of online CPU's

    ageric authored gitster committed
    Packing objects can be done in parallell nowadays, but it's
    only done if the config option pack.threads is set to a value
    above 1. Because of that, the code-path used is often not the
    most optimal one.
    
    This patch adds a routine to detect the number of online CPU's
    at runtime (online_cpus()). When pack.threads (or --threads=) is
    given a value of 0, the number of threads is set to the number of
    online CPU's. This feature is also documented.
    
    As per Nicolas Pitre's recommendations, the default is still to
    run pack-objects single-threaded unless explicitly activated,
    either by configuration or by command line parameter.
    
    The routine online_cpus() is a rework of "numcpus.c", written by
    one Philip Willoughby <pgw99@doc.ic.ac.uk>. numcpus.c is in the
    public domain and can presently be downloaded from
    http://csgsoft.doc.ic.ac.uk/numcpus/
    
    Signed-off-by: Andreas Ericsson <ae@op5.se>
    Signed-off-by: Brandon Casey <casey@nrlssc.navy.mil>
    Signed-off-by: Junio C Hamano <gitster@pobox.com>
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