Martin Fick 43a4e17fbb Add an exponentially rolling garbage collection script ... git-exproll is a git garbage collection script aimed specifically at reducing exccessive garbage collection and particularly large packfile churn for Gerrit installations. Excessive garbage collection on "dormant" repos is wasteful of both CPU and disk IO. Large packfile churn can lead to heavy RAM and FS usage on Gerrit servers when the Gerrit process continues to hold open the old delete packfiles. This situation is most detrimental when jgit is configured with large caching parameters. Aside from these downsides, running git gc often can be very beneficial to performance on servers. This script attempts to implement a git gc policy which avoids the downsides mentioned above so that git gc can be comfortably run very regularly. git-exproll.sh uses keep files to manage which files will get repacked. It also uses timestamps on the repos to detect dormant repos to avoid repacking them at all. The primary packfile objective is to keep around a series of packfiles with sizes spaced out exponentially from each other, and to roll smaller packfiles into larger ones once the smaller ones have grown. This strategy attempts to balance disk space usage with avoiding rewriting large packfiles most of the time. The exponential packing objective above does not save a large amount of time or CPU, but it does prevent the packfile churn. Depending on repo usage, however the dormant repo detection and avoidance can result in a very large time savings. Change-Id: I5e8c3cc02f6ca382d34f62af2cf12a9cb8ffd21e		2012-06-14 18:24:17 -06:00
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check-valid-commit.py	Add an example hook script for checking valid commits	2010-06-18 16:15:22 -05:00
git-exproll.sh	Add an exponentially rolling garbage collection script	2012-06-14 18:24:17 -06:00
trivial_rebase.py	updating contrib trivial_rebase.py for 2.2.2.1	2012-02-24 18:12:12 +00:00