Mercurial problem with large binary changesets

Wed May 30 12:01:01 UTC 2007

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 > It's possible that if your template contains a huge number of LF
 > characters, memory usage could be especially ugly. The delta
 > algorithm is "line-based", even for "binary" files. Can you count
 > them?

wc -l reports 173312 lines.

 > Alternately, you can hack mercurial/bdiff.c to report how big its
 > various mallocs are. Line 78 is the most likely culprit.

Allocations in bdiff.c:78 does not correlate well with the behavior I
observe.  There are a few medium-sized allocation there:

2007-05-30 11:41:58.195043 - bdiff: 107560
2007-05-30 11:42:00.009550 - bdiff: 141280
2007-05-30 11:42:02.212016 - bdiff: 3026560

I can't interpret if this is excessive or not.

I see the problem might be related to decompression.  From the stack trace:

File "/var/lib/python-support/python2.4/mercurial/revlog.py", line 66,
in decompress
      if t == 'x': return zlib.decompress(bin)

Is there a way to debug that?

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