Mercurial > hg > mercurial-crew-with-dirclash
view tests/test-update-reverse @ 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 |
line wrap: on
line source
#!/bin/sh hg init touch a hg add a hg commit -m "Added a" -d "1000000 0" touch main hg add main hg commit -m "Added main" -d "1000000 0" hg checkout 0 echo Main should be gone ls touch side1 hg add side1 hg commit -m "Added side1" -d "1000000 0" touch side2 hg add side2 hg commit -m "Added side2" -d "1000000 0" hg log echo Should have two heads, side2 and main hg heads echo Should show "a side1 side2" ls hg update --debug -C 1 echo Should only show "a main" ls