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comparison mercurial/util.py @ 23495:b25f07cb5399

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util: add a 'nogc' decorator to disable the garbage collection Garbage collection behave pathologically when creating a lot of containers. As we do that more than once it become sensible to have a decorator for it. See inline documentation for details.
author Pierre-Yves David <pierre-yves.david@fb.com>
date Thu, 04 Dec 2014 05:43:40 -0800
parents 46265d0f0c7b
children 4dd8a6a1240d
comparison
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23494:3849b89459b0 23495:b25f07cb5399
18 import error, osutil, encoding 18 import error, osutil, encoding
19 import errno, shutil, sys, tempfile, traceback 19 import errno, shutil, sys, tempfile, traceback
20 import re as remod 20 import re as remod
21 import os, time, datetime, calendar, textwrap, signal, collections 21 import os, time, datetime, calendar, textwrap, signal, collections
22 import imp, socket, urllib 22 import imp, socket, urllib
23 import gc
23 24
24 if os.name == 'nt': 25 if os.name == 'nt':
25 import windows as platform 26 import windows as platform
26 else: 27 else:
27 import posix as platform 28 import posix as platform
542 return True 543 return True
543 544
544 def never(fn): 545 def never(fn):
545 return False 546 return False
546 547
548 def nogc(func):
549 """disable garbage collector
550
551 Python's garbage collector triggers a GC each time a certain number of
552 container objects (the number being defined by gc.get_threshold()) are
553 allocated even when marked not to be tracked by the collector. Tracking has
554 no effect on when GCs are triggered, only on what objects the GC looks
555 into. As a workaround, disable GC while building complexe (huge)
556 containers.
557
558 This garbage collector issue have been fixed in 2.7.
559 """
560 def wrapper(*args, **kwargs):
561 gcenabled = gc.isenabled()
562 gc.disable()
563 try:
564 return func(*args, **kwargs)
565 finally:
566 if gcenabled:
567 gc.enable()
568 return wrapper
569
547 def pathto(root, n1, n2): 570 def pathto(root, n1, n2):
548 '''return the relative path from one place to another. 571 '''return the relative path from one place to another.
549 root should use os.sep to separate directories 572 root should use os.sep to separate directories
550 n1 should use os.sep to separate directories 573 n1 should use os.sep to separate directories
551 n2 should use "/" to separate directories 574 n2 should use "/" to separate directories