Mercurial > hg > mercurial-crew-with-dirclash
view tests/test-merge-revert @ 2577:fa76c5d609c9
bdiff: improve worst case behavior by 100x.
on 5.8MB (244.000 lines) text file with similar lines, hash before
this change made diff against empty file take 75 seconds. this change
improves performance to 0.6 seconds. result is that clone of smallish
repo (137MB) with some files like this takes 1 minute instead of 10
minutes.
common case of diff is 10% slower now, probably because of worse cache
locality. but diff does not affect overall performance in common case
(less than 1% of runtime is in diff when it is working ok), so this
tradeoff looks good.
| author | Vadim Gelfer <vadim.gelfer@gmail.com> |
|---|---|
| date | Fri, 07 Jul 2006 15:02:55 -0700 |
| parents | 7544700fd931 |
| children | 890e285c52a1 |
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#!/bin/sh mkdir t cd t hg init echo "added file1" > file1 echo "added file2" > file2 hg add file1 file2 hg commit -m "added file1 and file2" -d "1000000 0" -u user echo "changed file1" >> file1 hg commit -m "changed file1" -d "1000000 0" -u user hg -q log hg id hg update -C 0 hg id echo "changed file1" >> file1 hg id hg revert hg diff hg status hg id hg update hg diff hg status hg id hg update -C 0 echo "changed file1" >> file1 HGMERGE=merge hg update hg diff hg status hg id hg revert hg diff hg status hg id hg revert -r tip hg diff hg status hg id hg update -C hg diff hg status hg id cd ..; /bin/rm -rf t