Mercurial > hg > mercurial-crew-with-dirclash
annotate tests/test-empty-dir @ 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 | 7012c889e8f2 |
| rev | line source |
|---|---|
| 578 | 1 #!/bin/sh |
| 2 | |
| 3 hg init | |
| 4 echo 123 > a | |
| 5 hg add a | |
|
1933
7544700fd931
Use 'hg ci -d "1000000 0"' in tests to circumvent problem with leading zero.
Thomas Arendsen Hein <thomas@intevation.de>
parents:
1926
diff
changeset
|
6 hg commit -m "first" -d "1000000 0" a |
| 578 | 7 mkdir sub |
| 8 echo 321 > sub/b | |
| 9 hg add sub/b | |
|
1933
7544700fd931
Use 'hg ci -d "1000000 0"' in tests to circumvent problem with leading zero.
Thomas Arendsen Hein <thomas@intevation.de>
parents:
1926
diff
changeset
|
10 hg commit -m "second" -d "1000000 0" sub/b |
| 578 | 11 cat sub/b |
| 12 hg co 0 | |
|
1926
ba198d17eea9
changes by John Levon to standardize some erroroutput
Peter van Dijk <peter@dataloss.nl>
parents:
814
diff
changeset
|
13 cat sub/b 2>/dev/null || echo "sub/b not present" |
|
ba198d17eea9
changes by John Levon to standardize some erroroutput
Peter van Dijk <peter@dataloss.nl>
parents:
814
diff
changeset
|
14 ls sub 2>/dev/null || echo "sub not present" |
| 578 | 15 |
| 16 true |