revlog-compression: use zstd by default (if available)
As see in changeset bb271ec2fbfb, zstd is 20% to 50% faster for reading and
writing.
Use take advantage of the new config behavior to try zstd by default, falling
back to zlib is zstd is not available on that plateform.
Differential Revision: https://phab.mercurial-scm.org/D10326
#testcases tree flat-fncache flat-nofncache
Tests narrow stream clones
$ . "$TESTDIR/narrow-library.sh"
#if tree
$ cat << EOF >> $HGRCPATH
> [experimental]
> treemanifest = 1
> EOF
#endif
#if flat-nofncache
$ cat << EOF >> $HGRCPATH
> [format]
> usefncache = 0
> EOF
#endif
Server setup
$ hg init master
$ cd master
$ mkdir dir
$ mkdir dir/src
$ cd dir/src
$ for x in `$TESTDIR/seq.py 20`; do echo $x > "F$x"; hg add "F$x"; hg commit -m "Commit src $x"; done
$ cd ..
$ mkdir tests
$ cd tests
$ for x in `$TESTDIR/seq.py 20`; do echo $x > "F$x"; hg add "F$x"; hg commit -m "Commit src $x"; done
$ cd ../../..
Trying to stream clone when the server does not support it
$ hg clone --narrow ssh://user@dummy/master narrow --noupdate --include "dir/src/F10" --stream
streaming all changes
remote: abort: server does not support narrow stream clones
abort: pull failed on remote
[255]
Enable stream clone on the server
$ echo "[experimental]" >> master/.hg/hgrc
$ echo "server.stream-narrow-clones=True" >> master/.hg/hgrc
Cloning a specific file when stream clone is supported
$ hg clone --narrow ssh://user@dummy/master narrow --noupdate --include "dir/src/F10" --stream
streaming all changes
* files to transfer, * KB of data (glob)
transferred * KB in * seconds (* */sec) (glob)
$ cd narrow
$ ls -A
.hg
$ hg tracked
I path:dir/src/F10
Making sure we have the correct set of requirements
$ cat .hg/requires
dotencode (tree !)
dotencode (flat-fncache !)
fncache (tree !)
fncache (flat-fncache !)
generaldelta
narrowhg-experimental
revlog-compression-zstd (zstd !)
revlogv1
sparserevlog
store
treemanifest (tree !)
Making sure store has the required files
$ ls .hg/store/
00changelog.i
00manifest.i
data
fncache (tree !)
fncache (flat-fncache !)
meta (tree !)
narrowspec
undo
undo.backupfiles
undo.narrowspec
undo.phaseroots
Checking that repository has all the required data and not broken
$ hg verify
checking changesets
checking manifests
checking directory manifests (tree !)
crosschecking files in changesets and manifests
checking files
checked 40 changesets with 1 changes to 1 files