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| author | Theodore Ts'o <tytso@mit.edu> | 2007-06-29 13:40:46 -0400 |
|---|---|---|
| committer | Junio C Hamano <gitster@pobox.com> | 2007-06-30 20:16:12 -0700 |
| commit | 06f59e9f5daa06fc4bd51cf4c508b3edd3ed514a (patch) | |
| tree | 589caae1830bf51eb10f1022cdb0a8f5fa97ba07 /Documentation | |
| parent | ee36856d8c8c1f8d53650a70d8f61561fb65ba38 (diff) | |
| download | git-06f59e9f5daa06fc4bd51cf4c508b3edd3ed514a.tar.gz git-06f59e9f5daa06fc4bd51cf4c508b3edd3ed514a.tar.xz | |
Don't fflush(stdout) when it's not helpful
This patch arose from a discussion started by Jim Meyering's patch
whose intention was to provide better diagnostics for failed writes.
Linus proposed a better way to do things, which also had the added
benefit that adding a fflush() to git-log-* operations and incremental
git-blame operations could improve interactive respose time feel, at
the cost of making things a bit slower when we aren't piping the
output to a downstream program.
This patch skips the fflush() calls when stdout is a regular file, or
if the environment variable GIT_FLUSH is set to "0". This latter can
speed up a command such as:
GIT_FLUSH=0 strace -c -f -e write time git-rev-list HEAD | wc -l
a tiny amount.
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Acked-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/git.txt | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/Documentation/git.txt b/Documentation/git.txt index 20b5b7bb4..826914837 100644 --- a/Documentation/git.txt +++ b/Documentation/git.txt @@ -396,6 +396,16 @@ other 'GIT_PAGER':: This environment variable overrides `$PAGER`. +'GIT_FLUSH':: + If this environment variable is set to "1", then commands such + as git-blame (in incremental mode), git-rev-list, git-log, + git-whatchanged, etc., will force a flush of the output stream + after each commit-oriented record have been flushed. If this + variable is set to "0", the output of these commands will be done + using completely buffered I/O. If this environment variable is + not set, git will choose buffered or record-oriented flushing + based on whether stdout appears to be redirected to a file or not. + 'GIT_TRACE':: If this variable is set to "1", "2" or "true" (comparison is case insensitive), git will print `trace:` messages on |