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durham db053e1eb7 Improve performance of mercurial arc diff
Summary:
arc diff on large mercurial repos was taking 14 seconds just to get
to the commit message prompt.  With these optimizations it takes 4.

- "ancestor(.) - ancestor(XYZ)" is expensive because it has to build the
entire 400000+ revision history for both.  "XYZ::. - XYZ" is much cheaper
because it only looks at the revisions between XYZ and the working directory.

- "hg outgoing" has to talk to the server, which is slow.  "hg log -r draft()"
gives us the same information and is much cheaper.  We fall back to 'outgoing'
on older versions of mercurial.

Of the remaining 4 seconds, 2.5 are spent in 'hg status', which is a bit harder
improve.

Test Plan: Ran arc diff on our hg repo. Verified it ran faster and the diff was created.

Reviewers: epriestley, sid0, bos, dschleimer

Reviewed By: epriestley

CC: aran, Korvin, tido

Differential Revision: https://secure.phabricator.com/D4838
2013-02-08 05:54:32 -08:00
bin Allow arc.bat to work from paths with spaces in them 2013-01-09 12:34:30 -08:00
externals Update PEP8 to 1.3.4 2012-12-21 11:34:40 -08:00
resources Delete license headers from files 2012-11-05 11:16:24 -08:00
scripts Fix dynamic string usage as safe input 2013-02-03 15:04:45 -08:00
src Improve performance of mercurial arc diff 2013-02-08 05:54:32 -08:00
.arcconfig Delete license headers from files 2012-11-05 11:16:24 -08:00
.divinerconfig Make the "this is technical documentation" message of "Arcanist Overview" more clear 2012-08-10 11:37:30 -07:00
.editorconfig Specify config for text editors 2012-11-03 00:13:53 -07:00
.gitignore Allow arcanist to search for libphutil in externals/includes/ 2012-08-10 14:58:19 -07:00
LICENSE Delete license headers from files 2012-11-05 11:16:24 -08:00
NOTICE Delete license headers from files 2012-11-05 11:16:24 -08:00
README Delete license headers from files 2012-11-05 11:16:24 -08:00

WHAT IS ARCANIST?

Arcanist is the command-line tool for Phabricator. It allows you to interact
with Phabricator installs to send code for review, download patches, transfer
files, view status, make API calls, and various other things. You can find
a complete user guide here:

  http://www.phabricator.com/docs/phabricator/article/Arcanist_User_Guide.html

For more information about Phabricator, see:

  http://phabricator.org/

LICENSE

Arcanist is released under the Apache 2.0 license except as otherwise noted.