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diff mercurial/revlog.py @ 41086:a28833d79aca

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revlog: use the native implementation of issnapshot In some sparserevlog case where a lot of the history has to be searched for a snapshot, the cost of issnashot cost becomes significant. The computation done by the method is fairly low level, a native implementation provide a very significant speedup. example affected manifest write before: 0.490375s after: 0.114989s (-76%)
author Boris Feld <boris.feld@octobus.net>
date Fri, 21 Dec 2018 05:27:38 +0100
parents 84491ae0b3f0
children 536c83535cbd
line wrap: on
line diff
--- a/mercurial/revlog.py	Mon Dec 17 10:57:13 2018 +0100
+++ b/mercurial/revlog.py	Fri Dec 21 05:27:38 2018 +0100
@@ -1533,14 +1533,18 @@
     def issnapshot(self, rev):
         """tells whether rev is a snapshot
         """
+        if not self._sparserevlog:
+            return self.deltaparent(rev) == nullrev
+        elif util.safehasattr(self.index, 'issnapshot'):
+            # directly assign the method to cache the testing and access
+            self.issnapshot = self.index.issnapshot
+            return self.issnapshot(rev)
         if rev == nullrev:
             return True
         entry = self.index[rev]
         base = entry[3]
         if base == rev:
             return True
-        elif not self._sparserevlog:
-            return False
         if base == nullrev:
             return True
         p1 = entry[5]