revlog: break up compression of large deltas Python's zlib apparently makes an internal copy of strings passed to compress(). To avoid this, compress strings 1M at a time, then join them at the end if the result would be smaller than the original. For initial commits of large but compressible files, this cuts peak memory usage nearly in half.

#!/bin/sh
# basic test for hg debugrebuildstate

hg init repo
cd repo

touch foo bar
hg ci -Am 'add foo bar'

touch baz
hg add baz
hg rm bar

echo '% state dump'
hg debugstate | cut -b 1-16,35- | sort
echo '% status'
hg st -A

hg debugrebuildstate
echo '% state dump'
hg debugstate | cut -b 1-16,35- | sort
echo '% status'
hg st -A