view tests/test-demandimport.py.out @ 22356:3c8fb24334e9

branchmap: issue a single call to `ancestors` for all heads

There is no reason to make multiple calls. This provides a massive speedup for
repo with a lot of heads.

On a strongly headed repo this gives humble speedup in simple case:

    from 8.1097 to 5.1051

And massive speedup in other case:

    from 7.8787 to 0.1984

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'>
node = <module 'mercurial.node' from '?'>