Mercurial > hg
view tests/test-bundle-type.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 | d8270223a026 |
children | 2370c66110cb |
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$ cat << EOF >> $HGRCPATH > [format] > usegeneraldelta=yes > EOF bundle w/o type option $ hg init t1 $ hg init t2 $ cd t1 $ echo blablablablabla > file.txt $ hg ci -Ama adding file.txt $ hg log | grep summary summary: a $ hg bundle ../b1 ../t2 searching for changes 1 changesets found $ cd ../t2 $ hg pull ../b1 pulling from ../b1 requesting all changes adding changesets adding manifests adding file changes added 1 changesets with 1 changes to 1 files (run 'hg update' to get a working copy) $ hg up 1 files updated, 0 files merged, 0 files removed, 0 files unresolved $ hg log | grep summary summary: a $ cd .. test bundle types $ for t in "None" "bzip2" "gzip" "none-v2" "v2" "v1" "gzip-v1"; do > echo % test bundle type $t > hg init t$t > cd t1 > hg bundle -t $t ../b$t ../t$t > f -q -B6 -D ../b$t; echo > cd ../t$t > hg debugbundle ../b$t > echo > cd .. > done % test bundle type None searching for changes 1 changesets found HG20\x00\x00 (esc) Stream params: {} changegroup -- "{'version': '02'}" c35a0f9217e65d1fdb90c936ffa7dbe679f83ddf % test bundle type bzip2 searching for changes 1 changesets found HG20\x00\x00 (esc) Stream params: {'Compression': 'BZ'} changegroup -- "{'version': '02'}" c35a0f9217e65d1fdb90c936ffa7dbe679f83ddf % test bundle type gzip searching for changes 1 changesets found HG20\x00\x00 (esc) Stream params: {'Compression': 'GZ'} changegroup -- "{'version': '02'}" c35a0f9217e65d1fdb90c936ffa7dbe679f83ddf % test bundle type none-v2 searching for changes 1 changesets found HG20\x00\x00 (esc) Stream params: {} changegroup -- "{'version': '02'}" c35a0f9217e65d1fdb90c936ffa7dbe679f83ddf % test bundle type v2 searching for changes 1 changesets found HG20\x00\x00 (esc) Stream params: {'Compression': 'BZ'} changegroup -- "{'version': '02'}" c35a0f9217e65d1fdb90c936ffa7dbe679f83ddf % test bundle type v1 searching for changes 1 changesets found HG10BZ c35a0f9217e65d1fdb90c936ffa7dbe679f83ddf % test bundle type gzip-v1 searching for changes 1 changesets found HG10GZ c35a0f9217e65d1fdb90c936ffa7dbe679f83ddf test garbage file $ echo garbage > bgarbage $ hg init tgarbage $ cd tgarbage $ hg pull ../bgarbage pulling from ../bgarbage abort: ../bgarbage: not a Mercurial bundle [255] $ cd .. test invalid bundle type $ cd t1 $ hg bundle -a -t garbage ../bgarbage abort: garbage is not a recognized bundle specification (see "hg help bundle" for supported values for --type) [255] $ cd ..