The main loop of munge_blobs() had to fork-exec "cat" every time through the
loop, even when a blob was already cached. Let's use the sh builtin 'read'
instead for a huge speedup.
cd git
time git filter-branch --blob-filter 'tr a-z A-Z' HEAD~10..HEAD
(original --blob-filter)
real 3m58.569s
user 0m22.900s
sys 3m32.030s
(with 'cat' calls removed)
real 1m11.931s
user 0m8.520s
sys 1m2.900s
(with 'cat' calls removed and blob cache already filled)
real 0m19.660s
user 0m3.930s
sys 0m15.720s
Signed-off-by: Avery Pennarun <apenwarr@xxxxxxxxx>
---
git-filter-branch.sh | 18 +++++++++++-------
1 files changed, 11 insertions(+), 7 deletions(-)
diff --git a/git-filter-branch.sh b/git-filter-branch.sh
index 980c431..37ac99d 100755
--- a/git-filter-branch.sh
+++ b/git-filter-branch.sh
@@ -57,16 +57,18 @@ eval "$functions"
munge_blobs() {
while read mode sha1 stage path
do
- if ! test -r "$workdir/../blob-cache/$sha1"
+ if ! test -r "$cachedir/$sha1"
then
- new=`git cat-file blob $sha1 |
- eval "$filter_blob" |
- git hash-object -w --stdin`
- printf $new >$workdir/../blob-cache/$sha1
+ new=$(git cat-file blob $sha1 |
+ eval "$filter_blob" |
+ git hash-object -w --stdin)
+ printf $new >$cachedir/$sha1
+ else
+ read new <"$cachedir/$sha1"
fi
printf "%s %s\t%s\n" \
"$mode" \
- $(cat "$workdir/../blob-cache/$sha1") \
+ "$new" \
"$path"
done
}
@@ -108,6 +110,7 @@ USAGE="[--env-filter <command>] [--tree-filter <command>] \
[--index-filter <command>] [--parent-filter <command>] \
[--msg-filter <command>] [--commit-filter <command>] \
[--tag-name-filter <command>] [--subdirectory-filter <directory>] \
+[--blob-filter <command>] \
[--original <namespace>] [-d <directory>] [-f | --force] \
[<rev-list options>...]"
@@ -249,7 +252,8 @@ ret=0
mkdir ../map || die "Could not create map/ directory"
# cache rewritten blobs for blob filter
-mkdir ../blob-cache || die "Could not create blob-cache/ directory"
+cachedir="$workdir/../blob-cache"
+mkdir "$cachedir" || die "Could not create blob-cache/ directory"
case "$filter_subdir" in
"")
--
1.5.4.3
--
To unsubscribe from this list: send the line "unsubscribe git" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
