Mercurial > hg
view tests/test-demandimport.py.out @ 16414:e8d37b78acfb
parsers: use base-16 trie for faster node->rev mapping
This greatly speeds up node->rev lookups, with results that are
often user-perceptible: for instance, "hg --time log" of the node
associated with rev 1000 on a linux-2.6 repo improves from 0.3
seconds to 0.03. I have not found any instances of slowdowns.
The new perfnodelookup command in contrib/perf.py demonstrates the
speedup more dramatically, since it performs no I/O. For a single
lookup, the new code is about 40x faster.
These changes also prepare the ground for the possibility of further
improving the performance of prefix-based node lookups.
author | Bryan O'Sullivan <bryano@fb.com> |
---|---|
date | Thu, 12 Apr 2012 14:05:59 -0700 |
parents | c0290fc6b486 |
children | 54af51c18c4c |
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os = <unloaded module 'os'> os.system = <built-in function system> os = <module 'os' from '?'> util = <unloaded module 'util'> util.system = <function system at 0x?> util = <module 'mercurial.util' from '?'> util.system = <function system at 0x?> fred = <unloaded module 're'> re = <unloaded module 'sys'> fred = <unloaded module 're'> fred.sub = <function sub at 0x?> fred = <proxied module 're'> re = <unloaded module 'sys'> re.stderr = <open file '<whatever>', mode 'w' at 0x?> re = <proxied module 'sys'>