Optimize manifest.add Testing shows that manifest.add is spending a significant percentage of its time running calcoffsets and doing text = "".join(addlist). This patch removes the need for both of these by storying the manifest in a character array, and using a modified bisect search to find lines without the help of a separate index of line offsets. manifest.add was also reworked to push delta construction/combination into the main loop. Time to apply 2751 patches (without psyco, ext3 noatime,data=writeback): Stock hg: 4m45s real 3m32s user 55s sys patched: 2m48s real 1m53s user 43s sys quilt: 2m30s real 45s user 50s sys (quilt does much more io...)

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#!/bin/sh

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mkdir a

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cd a

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hg init

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echo foo > b

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hg add b

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hg ci -m "b" -d "0 0"

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chmod -w .hg

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cd ..

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hg clone a b

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cd b

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hg verify

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cd ..

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chmod +w a/.hg # let test clean up