Mercurial > hg
view tests/test-merge8.t @ 27475:a2e2a8fa5fd1
revlog: avoid string slice when decompressing u* chunks
Revlog chunks can be stored uncompressed. If the first byte of the
raw data is \0, we store the data as is. Else we prefix it with 'u'.
Before, we performed a string slice to strip out the 'u' prefix.
With this patch, we use a buffer to avoid an extra memory copy and
associated garbage collection overhead.
I was unable to verify any performance impact of this patch. For both
mozilla-central and the hg repos, the number of manifest revisions
with 'u' prefixes is very small - under 1%. So this change likely
isn't called enough to have an impact on manifest reading. However,
the reasoning behind this change is solid, so it should be safe.
author | Gregory Szorc <gregory.szorc@gmail.com> |
---|---|
date | Sun, 20 Dec 2015 16:00:27 -0800 |
parents | f2719b387380 |
children | eb586ed5d8ce |
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Test for changeset ba7c74081861 (update dirstate correctly for non-branchmerge updates) $ hg init a $ cd a $ echo a > a $ hg add a $ hg commit -m a $ cd .. $ hg clone a b updating to branch default 1 files updated, 0 files merged, 0 files removed, 0 files unresolved $ cd a $ hg mv a b $ hg commit -m move $ echo b >> b $ hg commit -m b $ cd ../b $ hg pull ../a pulling from ../a searching for changes adding changesets adding manifests adding file changes added 2 changesets with 2 changes to 1 files (run 'hg update' to get a working copy) $ hg update 1 files updated, 0 files merged, 1 files removed, 0 files unresolved $ cd ..