From: lin zuojian <manjian2006@gmail.com>
Date: Thu, 23 Jan 2014 02:15:19 +0000 (+0800)
Subject: git-svn: memoize _rev_list and rebuild
X-Git-Tag: v1.9-rc1~27^2
X-Git-Url: https://git.lorimer.id.au/gitweb.git/diff_plain/ab0bcec9873f1fcef6c4b8825cc9e762c636ca9e?hp=ab0bcec9873f1fcef6c4b8825cc9e762c636ca9e

git-svn: memoize _rev_list and rebuild

According to profile data, _rev_list and rebuild consume a large
portion of time.  Memoize the results of _rev_list and memoize
rebuild internals to avoid subprocess invocation.

When importing 15152 revisions on a LAN, time improved from 10
hours to 3-4 hours.

Signed-off-by: lin zuojian <manjian2006@gmail.com>
Signed-off-by: Eric Wong <normalperson@yhbt.net>
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