Mercurial > hg
comparison hgext/children.py @ 17962:4c29668ca316 stable
util: make chunkbuffer non-quadratic on Windows
The old str-based += collector performed very nicely on Linux, but
turns out to be quadratically expensive on Windows, causing
chunkbuffer to dominate in profiles.
This list-based version has been measured to significantly improve
performance with large chunks on Windows, with negligible overall
overhead on Linux (though microbenchmarks show it to be about 50% slower).
This may increase memory overhead where += didn't behave quadratically. If we
want to gather up 1G of data to join, we temporarily have 1G in our
list and 1G in our string.
author | Matt Mackall <mpm@selenic.com> |
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date | Mon, 26 Nov 2012 15:42:52 -0600 |
parents | 434e5bd615fc |
children | 48e859e30cbf |
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17961:b0affcb67cba | 17962:4c29668ca316 |
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