diff options
Diffstat (limited to 'Documentation/git-update-index.txt')
| -rw-r--r-- | Documentation/git-update-index.txt | 47 |
1 files changed, 37 insertions, 10 deletions
diff --git a/Documentation/git-update-index.txt b/Documentation/git-update-index.txt index 7386c93162..75c7dd9dea 100644 --- a/Documentation/git-update-index.txt +++ b/Documentation/git-update-index.txt @@ -153,7 +153,7 @@ you will need to handle the situation manually. + Version 4 performs a simple pathname compression that reduces index size by 30%-50% on large repositories, which results in faster load -time. Version 4 is relatively young (first released in in 1.8.0 in +time. Version 4 is relatively young (first released in 1.8.0 in October 2012). Other Git implementations such as JGit and libgit2 may not support it yet. @@ -163,14 +163,16 @@ may not support it yet. --split-index:: --no-split-index:: - Enable or disable split index mode. If enabled, the index is - split into two files, $GIT_DIR/index and $GIT_DIR/sharedindex.<SHA-1>. - Changes are accumulated in $GIT_DIR/index while the shared - index file contains all index entries stays unchanged. If - split-index mode is already enabled and `--split-index` is - given again, all changes in $GIT_DIR/index are pushed back to - the shared index file. This mode is designed for very large - indexes that take a significant amount of time to read or write. + Enable or disable split index mode. If split-index mode is + already enabled and `--split-index` is given again, all + changes in $GIT_DIR/index are pushed back to the shared index + file. ++ +These options take effect whatever the value of the `core.splitIndex` +configuration variable (see linkgit:git-config[1]). But a warning is +emitted when the change goes against the configured value, as the +configured value will take effect next time the index is read and this +will remove the intended effect of the option. --untracked-cache:: --no-untracked-cache:: @@ -212,7 +214,7 @@ will remove the intended effect of the option. Using --refresh --------------- `--refresh` does not calculate a new sha1 file or bring the index -up-to-date for mode/content changes. But what it *does* do is to +up to date for mode/content changes. But what it *does* do is to "re-match" the stat information of a file with the index, so that you can refresh the index for a file that hasn't been changed but where the stat entry is out of date. @@ -388,6 +390,31 @@ Although this bit looks similar to assume-unchanged bit, its goal is different from assume-unchanged bit's. Skip-worktree also takes precedence over assume-unchanged bit when both are set. +Split index +----------- + +This mode is designed for repositories with very large indexes, and +aims at reducing the time it takes to repeatedly write these indexes. + +In this mode, the index is split into two files, $GIT_DIR/index and +$GIT_DIR/sharedindex.<SHA-1>. Changes are accumulated in +$GIT_DIR/index, the split index, while the shared index file contains +all index entries and stays unchanged. + +All changes in the split index are pushed back to the shared index +file when the number of entries in the split index reaches a level +specified by the splitIndex.maxPercentChange config variable (see +linkgit:git-config[1]). + +Each time a new shared index file is created, the old shared index +files are deleted if their modification time is older than what is +specified by the splitIndex.sharedIndexExpire config variable (see +linkgit:git-config[1]). + +To avoid deleting a shared index file that is still used, its +modification time is updated to the current time everytime a new split +index based on the shared index file is either created or read from. + Untracked cache --------------- |