From 5749b0b2f935dc418c98ba8e7c52c3291451bc4a Mon Sep 17 00:00:00 2001 From: Nicolas Pitre Date: Wed, 5 Aug 2009 16:55:07 -0400 Subject: don't let the delta cache grow unbounded in 'git repack' I have 4GB of RAM on my system which should, in theory, be quite enough to repack a 600 MB repository. However the unbounded delta cache size always pushes it into swap, at which point everything virtually comes to a halt. So unbounded caches are never a good idea. A default of 256MB should be a good compromize between memory usage and speed where medium sized repositories are still likely to fit in the cache with a reasonable memory usage, and larger repositories are going to take quite some time to repack already anyway. While at it, clarify the associated config variable documentation entries a bit. Signed-off-by: Nicolas Pitre Signed-off-by: Junio C Hamano --- Documentation/config.txt | 14 +++++++++++--- 1 file changed, 11 insertions(+), 3 deletions(-) (limited to 'Documentation') diff --git a/Documentation/config.txt b/Documentation/config.txt index c6f09f801a..7791c32bc3 100644 --- a/Documentation/config.txt +++ b/Documentation/config.txt @@ -1218,12 +1218,20 @@ pack.compression:: pack.deltaCacheSize:: The maximum memory in bytes used for caching deltas in - linkgit:git-pack-objects[1]. - A value of 0 means no limit. Defaults to 0. + linkgit:git-pack-objects[1] before writing them out to a pack. + This cache is used to speed up the writing object phase by not + having to recompute the final delta result once the best match + for all objects is found. Repacking large repositories on machines + which are tight with memory might be badly impacted by this though, + especially if this cache pushes the system into swapping. + A value of 0 means no limit. The smallest size of 1 byte may be + used to virtually disable this cache. Defaults to 256 MiB. pack.deltaCacheLimit:: The maximum size of a delta, that is cached in - linkgit:git-pack-objects[1]. Defaults to 1000. + linkgit:git-pack-objects[1]. This cache is used to speed up the + writing object phase by not having to recompute the final delta + result once the best match for all objects is found. Defaults to 1000. pack.threads:: Specifies the number of threads to spawn when searching for best -- cgit v1.2.3