Signed-off-by: Christian Couder <chriscool@xxxxxxxxxxxxx> --- Documentation/config.txt | 2 +- Documentation/git-update-index.txt | 37 +++++++++++++++++++++++++++++-------- 2 files changed, 30 insertions(+), 9 deletions(-) diff --git a/Documentation/config.txt b/Documentation/config.txt index 0e9982c5e3..2ccb053d92 100644 --- a/Documentation/config.txt +++ b/Documentation/config.txt @@ -2853,7 +2853,7 @@ splitIndex.sharedIndexExpire:: The default value is "2.weeks.ago". Note that a shared index file is considered modified (for the purpose of expiration) each time a new split-index file is - created based on it. + either created based on it or read from it. See linkgit:git-update-index[1]. status.relativePaths:: diff --git a/Documentation/git-update-index.txt b/Documentation/git-update-index.txt index e091b2a409..1579abf3c3 100644 --- a/Documentation/git-update-index.txt +++ b/Documentation/git-update-index.txt @@ -163,14 +163,10 @@ 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 @@ -394,6 +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 --------------- -- 2.12.0.22.g0672473d40