[Bug 4527] New: 'hg commit' causes invalidation of tag cache

[mercurial-bugs at selenic.com]

http://bz.selenic.com/show_bug.cgi?id=4527

          Priority: normal
            Bug ID: 4527
                CC: mercurial-devel at selenic.com
          Assignee: bugzilla at selenic.com
           Summary: 'hg commit' causes invalidation of tag cache
          Severity: bug
    Classification: Unclassified
                OS: Windows
          Reporter: me at xavierzwirtz.com
          Hardware: PC
            Status: UNCONFIRMED
           Version: 3.3
         Component: Mercurial
           Product: Mercurial

I am working on a repository with 643 branches, and roughly 4000 tags in each
.hgtags file. Running 'hg commit' causes the tag cache to be invalidated, which
makes any calls to 'hg log -G' cause tags to be recalculated. This makes
committing via TortoiseHG incredibly slow due to its reliance on always showing
the graph.

Output from 'hg blackbox'
2015/02/04 02:57:52 Xavier> log -G -l 1
2015/02/04 02:58:14 Xavier> resolved 604 tags cache entries from 604 manifests
in 21.4730 seconds
2015/02/04 02:58:31 Xavier> writing tags cache file with 604 heads and 5213
tags
2015/02/04 02:58:31 Xavier> log -G -l 1 exited 0 after 38.65 seconds

Would changing the cache to only invalidate tags on commit if .hgtags was
changed be a acceptable solution?

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