[Request] [+ ] D9235: revlog: use LRU for the chain cache

[joerg.sonnenberger (Joerg Sonnenberger)]

joerg.sonnenberger created this revision.
Herald added a reviewer: indygreg.
Herald added a reviewer: hg-reviewers.
Herald added a subscriber: mercurial-patches.

REVISION SUMMARY
  For a large repository, this reduces the number of filelog instances and
  associated data a lot. For a 1% speed penalty, it reduces peak RSS by
  20% for the full NetBSD test repository.

REPOSITORY
  rHG Mercurial

BRANCH
  default

REVISION DETAIL
  https://phab.mercurial-scm.org/D9235

AFFECTED FILES
  mercurial/revlog.py

CHANGE DETAILS

diff --git a/mercurial/revlog.py b/mercurial/revlog.py
--- a/mercurial/revlog.py
+++ b/mercurial/revlog.py
@@ -668,7 +668,7 @@
         if not self._chunkcache:
             self._chunkclear()
         # revnum -> (chain-length, sum-delta-length)
-        self._chaininfocache = {}
+        self._chaininfocache = util.lrucachedict(500)
         # revlog header -> revlog compressor
         self._decompressors = {}
 
@@ -2557,7 +2557,7 @@
 
         # then reset internal state in memory to forget those revisions
         self._revisioncache = None
-        self._chaininfocache = {}
+        self._chaininfocache = util.lrucachedict(500)
         self._chunkclear()
 
         del self.index[rev:-1]



To: joerg.sonnenberger, indygreg, #hg-reviewers
Cc: mercurial-patches, mercurial-devel
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