Mercurial > hgsubversion
changeset 1250:05aea77371a3
util: add a decorator to disable Python's garbage collector
Python's GC can cause serious performance regressions if lots of small objects
are created within a function. We've empirically found that that happens while
loading the revmap.
| author | Siddharth Agarwal <sid0@fb.com> |
|---|---|
| date | Sun, 02 Nov 2014 01:55:18 -0800 |
| parents | 11c8de73b48a |
| children | 46cec117dda2 |
| files | hgsubversion/util.py |
| diffstat | 1 files changed, 13 insertions(+), 0 deletions(-) [+] |
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--- a/hgsubversion/util.py +++ b/hgsubversion/util.py @@ -4,6 +4,7 @@ import re import os import urllib import json +import gc from mercurial import cmdutil from mercurial import error @@ -55,6 +56,18 @@ def filterdiff(diff, oldrev, newrev): diff = header_re.sub(r'Index: \1' + '\n' + ('=' * 67), diff) return diff +def gcdisable(orig): + """decorator to disable GC for a function or method""" + def wrapper(*args, **kwargs): + enabled = gc.isenabled() + if enabled: + gc.disable() + try: + orig(*args, **kwargs) + finally: + if enabled: + gc.enable() + return wrapper def parentrev(ui, repo, meta, hashes): """Find the svn parent revision of the repo's dirstate.