tree_timewarp was calling read, egrep, and rm in an O(N) loop where N is
the number of changed files between two trees. This caused a bottleneck
when seeking/switching/merging between trees with many changed files.
On the historical linux tree, the time to cg-seek from the head to the
initial commit (a change of 19099 files) dropped from 2m35s to 21s.
---
cg-Xlib | 9 +++------
1 files changed, 3 insertions(+), 6 deletions(-)
a9a160c0bd63973c53ba3aa74650728135d23ac7
diff --git a/cg-Xlib b/cg-Xlib
index a2f28cf..ceddeeb 100644
--- a/cg-Xlib
+++ b/cg-Xlib
@@ -345,12 +345,9 @@ tree_timewarp()
# Kill gone files
git-diff-tree -r "$base" "$branch" |
- while IFS=$'\t' read header file; do
- # match ":100755 000000 14d43b1abf... 000000000... D"
- if echo "$header" | egrep "^:([^ ][^ ]* ){4}D" >/dev/null; then
- rm -- "$file"
- fi
- done
+ # match ":100755 000000 14d43b1abf... 000000000... D"
+ sed -ne 's/^:\([^ ][^ ]* \)\{4\}D\t//p' |
+ xargs rm --
git-checkout-index -u -f -a
# FIXME: Can produce bogus "contains only garbage" messages.
--
1.2.4
-
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