view mercurial/templates/raw/graph.tmpl @ 49579:15a89b722937 stable

tags-fnode-cache: do not repeatedly open the filelog in a loop

While getting multiple hgtagsfnodecache entries, we were opening (and closing)
the `.hgtags` filelog for each iteration. The meant repeatedly reading and
parsing the version same information from disk. A quite costly operation.

We no longer do this, leading to a sizable improvement in `hg debugupdatecache`
run for an already warm repositories.

### data-env-vars.name           = mercurial-2018-08-01-zstd-sparse-revlog
  # benchmark.name               = debug-update-cache
  # benchmark.variants.pre-state = warm
before:  1.711778 seconds
after:   0.213229 seconds  (-87.54%)
  # data-env-vars.name           = pypy-2018-08-01-zstd-sparse-revlog
before:  4.010817 seconds
after:   0.381141 seconds  (-90.50%)
  # data-env-vars.name           = netbeans-2018-08-01-zstd-sparse-revlog
before: 13.574141
after:   1.023007 seconds  (-92.46%)
  # data-env-vars.name           = mozilla-central-2018-08-01-zstd-sparse-revlog
before: 18.884656
after:   1.465735 seconds  (-92.24%)
  # data-env-vars.name           = mozilla-try-2019-02-18-zstd-sparse-revlog
before: 88.924823
after:   6.511771 seconds  (-92.68%)

{header}
# HG graph
# Node ID {node}
# Rows shown {rows}

{nodes%graphnode}