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view .hgtags @ 20499:2efd608473fb
revset: optimize missing ancestor expressions
A missing ancestor expression is any expression of the form (::x - ::y) or
equivalent. Such expressions are remarkably common, and so far have involved
multiple walks down the DAG, followed by a set difference operation.
With this patch, such expressions will be transformed into uses of the fast
algorithm at ancestor.missingancestor.
For a repository with over 600,000 revisions, perfrevset for '::tip - ::-10000'
returns:
Before: ! wall 3.999575 comb 4.000000 user 3.910000 sys 0.090000 (best of 3)
After: ! wall 0.132423 comb 0.130000 user 0.130000 sys 0.000000 (best of 75)
author | Siddharth Agarwal <sid0@fb.com> |
---|---|
date | Thu, 13 Feb 2014 14:04:47 -0800 |
parents | 06a9ed0c15d6 |
children | adec4543e489 |
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