view CONTRIBUTORS @ 51910:5d352e36ce06

rev-branch-cache: reenable memory mapping of the revision data

Now that we are no longer truncating it, we can mmap it again.

This provide a sizeable speedup on repository with a very large amount of
revision for example for a mozilla-try clone with 5 793 383 revisions, this
provide a speedup of 5ms - 10ms. Since they happens within the "critical" locked
path during push. These miliseconds are important.

In addition, the v3 branchmap format is use the rev-branch-cache more than the
v2 branchmap cache so this will be important.

On smaller repository we consistently see an improvement of one or two percents,
but the gain in absolute time is usually < 10 ms.

#### benchmark.name                                 = hg.command.unbundle
   # benchmark.variants.issue6528                   = disabled
   # benchmark.variants.reuse-external-delta-parent = yes
   # benchmark.variants.revs                        = any-1-extra-rev
   # benchmark.variants.source                      = unbundle
   # benchmark.variants.verbosity                   = quiet

 ### data-env-vars.name = mozilla-try-2024-03-26-zstd-sparse-revlog
  ## bin-env-vars.hg.flavor = default
e51161b12c7e: 3.527923
ebdcfe85b070: 3.468178   (-1.69%, -0.06)
  ## bin-env-vars.hg.flavor = rust
e51161b12c7e: 3.580158
ebdcfe85b070: 3.480564   (-2.78%, -0.10)
 ### data-env-vars.name = mozilla-try-2024-03-26-ds2-pnm
  ## bin-env-vars.hg.flavor = rust
e51161b12c7e: 3.527923
ebdcfe85b070: 3.468178 (-1.69%, -0.06)

[This file is here for historical purposes, all recent contributors
should appear in the changelog directly]

Andrea Arcangeli <andrea at suse.de>
Thomas Arendsen Hein <thomas at intevation.de>
Goffredo Baroncelli <kreijack at libero.it>
Muli Ben-Yehuda <mulix at mulix.org>
Mikael Berthe <mikael at lilotux.net>
Benoit Boissinot <bboissin at gmail.com>
Brendan Cully <brendan at kublai.com>
Vincent Danjean <vdanjean.ml at free.fr>
Jake Edge <jake at edge2.net>
Michael Fetterman <michael.fetterman at intel.com>
Edouard Gomez <ed.gomez at free.fr>
Eric Hopper <hopper at omnifarious.org>
Alecs King <alecsk at gmail.com>
Volker Kleinfeld <Volker.Kleinfeld at gmx.de>
Vadim Lebedev <vadim at mbdsys.com>
Christopher Li <hg at chrisli.org>
Chris Mason <mason at suse.com>
Colin McMillen <mcmillen at cs.cmu.edu>
Wojciech Milkowski <wmilkowski at interia.pl>
Chad Netzer <chad.netzer at gmail.com>
Bryan O'Sullivan <bos at serpentine.com>
Vicent Seguí Pascual <vseguip at gmail.com>
Sean Perry <shaleh at speakeasy.net>
Nguyen Anh Quynh <aquynh at gmail.com>
Ollivier Robert <roberto at keltia.freenix.fr>
Alexander Schremmer <alex at alexanderweb.de>
Arun Sharma <arun at sharma-home.net>
Josef "Jeff" Sipek <jeffpc at optonline.net>
Kevin Smith <yarcs at qualitycode.com>
TK Soh <teekaysoh at yahoo.com>
Radoslaw Szkodzinski <astralstorm at gorzow.mm.pl>
Samuel Tardieu <sam at rfc1149.net>
K Thananchayan <thananck at yahoo.com>
Andrew Thompson <andrewkt at aktzero.com>
Michael S. Tsirkin <mst at mellanox.co.il>
Rafael Villar Burke <pachi at mmn-arquitectos.com>
Tristan Wibberley <tristan at wibberley.org>
Mark Williamson <mark.williamson at cl.cam.ac.uk>