D477: revlog: add option to mmap revlog index

mbthomas (Mark Thomas) phabricator at mercurial-scm.org
Fri Sep 15 12:25:23 EDT 2017


mbthomas added a comment.


  I had put the numbers in the commit message, but that doesn't update the Phabricator summary, so I've done that manually.
  
  It should be clear from the numbers that the improvement only really surfaces when the filesystem cache is warm, and there is a penalty for using this option when the filesystem cache is cold.  Since the cache should be warm more often than not, the expectation is an overall improvement.

REPOSITORY
  rHG Mercurial

REVISION DETAIL
  https://phab.mercurial-scm.org/D477

To: mbthomas, #fbhgext, indygreg, #hg-reviewers, durin42, quark
Cc: quark, durin42, simonfar, mercurial-devel


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