Mercurial > hg-stable
changeset 24736:f2fd087a75ef
parsers: when available, use a presized dictionary for the file foldmap
On a repo with over 300,000 files, this speeds up perffilefoldmap:
before: wall 0.178421 comb 0.180000 user 0.160000 sys 0.020000 (best of 55)
after: wall 0.164462 comb 0.160000 user 0.140000 sys 0.020000 (best of 59)
| author | Siddharth Agarwal <sid0@fb.com> |
|---|---|
| date | Wed, 15 Apr 2015 14:35:44 -0700 |
| parents | 07200e3332a1 |
| children | b061a2049662 |
| files | mercurial/parsers.c |
| diffstat | 1 files changed, 13 insertions(+), 0 deletions(-) [+] |
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--- a/mercurial/parsers.c Wed Apr 15 17:42:38 2015 -0400 +++ b/mercurial/parsers.c Wed Apr 15 14:35:44 2015 -0700 @@ -205,7 +205,20 @@ goto quit; } +#if PY_VERSION_HEX >= 0x02060000 + /* _PyDict_NewPresized expects a minused parameter, but it actually + creates a dictionary that's the nearest power of two bigger than the + parameter. For example, with the initial minused = 1000, the + dictionary created has size 1024. Of course in a lot of cases that + can be greater than the maximum load factor Python's dict object + expects (= 2/3), so as soon as we cross the threshold we'll resize + anyway. So create a dictionary that's 3/2 the size. Also add some + more to deal with additions outside this function. */ + file_foldmap = _PyDict_NewPresized((PyDict_Size(dmap) / 5) * 8); +#else file_foldmap = PyDict_New(); +#endif + if (file_foldmap == NULL) goto quit;