stream-clone: disable gc for the initial section for the v3 format The number of small container created turn Python in a gc-frenzy that seriously impact performance. This significantly boost performance. The following number comes from a large private repository using perf::stream-locked-section: base-line: 35.04 seconds prev-change: 24.51 seconds (-30%) prev-change: 20.88 seconds (-40%) this-change: 14.22 seconds (-60% from baseline; -31% from prev)

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def run():

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    from . import demandimport

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    with demandimport.tracing.log('hg script'):

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        demandimport.enable()

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        from . import dispatch

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        dispatch.run()

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if __name__ == '__main__':

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    run()