Mercurial > hg
view tests/test-purge.t @ 30212:260af19891f2
changegroup: increase write buffer size to 128k
By default, Python defers to the operating system for choosing the
default buffer size on opened files. On my Linux machine, the default
is 4k, which is really small for 2016.
This patch bumps the write buffer size when writing
changegroups/bundles to 128k. This matches the 128k read buffer
we already use on revlogs.
It's worth noting that this only impacts when writing to an explicit
file (such as during `hg bundle`). Buffers when writing to bundle
files via the repo vfs or to a temporary file are not impacted.
When producing a none-v2 bundle file of the mozilla-unified repository,
this change caused the number of write() system calls to drop from
952,449 to 29,788. After this change, the most frequent system
calls are fstat(), read(), lseek(), and open(). There were
2,523,672 system calls after this patch (so a net decrease of
~950k is statistically significant).
This change shows no performance change on my system. But I have a
high-end system with a fast SSD. It is quite possible this change
will have a significant impact on network file systems, where
extra network round trips due to excessive I/O system calls could
introduce significant latency.
| author | Gregory Szorc <gregory.szorc@gmail.com> |
|---|---|
| date | Sun, 16 Oct 2016 13:35:23 -0700 |
| parents | 8127b9e798b1 |
| children | 8e6f4939a69a |
line wrap: on
line source
$ cat <<EOF >> $HGRCPATH > [extensions] > purge = > EOF init $ hg init t $ cd t setup $ echo r1 > r1 $ hg ci -qAmr1 -d'0 0' $ mkdir directory $ echo r2 > directory/r2 $ hg ci -qAmr2 -d'1 0' $ echo 'ignored' > .hgignore $ hg ci -qAmr3 -d'2 0' delete an empty directory $ mkdir empty_dir $ hg purge -p -v empty_dir $ hg purge -v removing directory empty_dir $ ls directory r1 delete an untracked directory $ mkdir untracked_dir $ touch untracked_dir/untracked_file1 $ touch untracked_dir/untracked_file2 $ hg purge -p untracked_dir/untracked_file1 untracked_dir/untracked_file2 $ hg purge -v removing file untracked_dir/untracked_file1 removing file untracked_dir/untracked_file2 removing directory untracked_dir $ ls directory r1 delete an untracked file $ touch untracked_file $ touch untracked_file_readonly $ python <<EOF > import os, stat > f= 'untracked_file_readonly' > os.chmod(f, stat.S_IMODE(os.stat(f).st_mode) & ~stat.S_IWRITE) > EOF $ hg purge -p untracked_file untracked_file_readonly $ hg purge -v removing file untracked_file removing file untracked_file_readonly $ ls directory r1 delete an untracked file in a tracked directory $ touch directory/untracked_file $ hg purge -p directory/untracked_file $ hg purge -v removing file directory/untracked_file $ ls directory r1 delete nested directories $ mkdir -p untracked_directory/nested_directory $ hg purge -p untracked_directory/nested_directory $ hg purge -v removing directory untracked_directory/nested_directory removing directory untracked_directory $ ls directory r1 delete nested directories from a subdir $ mkdir -p untracked_directory/nested_directory $ cd directory $ hg purge -p untracked_directory/nested_directory $ hg purge -v removing directory untracked_directory/nested_directory removing directory untracked_directory $ cd .. $ ls directory r1 delete only part of the tree $ mkdir -p untracked_directory/nested_directory $ touch directory/untracked_file $ cd directory $ hg purge -p ../untracked_directory untracked_directory/nested_directory $ hg purge -v ../untracked_directory removing directory untracked_directory/nested_directory removing directory untracked_directory $ cd .. $ ls directory r1 $ ls directory/untracked_file directory/untracked_file $ rm directory/untracked_file skip ignored files if --all not specified $ touch ignored $ hg purge -p $ hg purge -v $ ls directory ignored r1 $ hg purge -p --all ignored $ hg purge -v --all removing file ignored $ ls directory r1 abort with missing files until we support name mangling filesystems $ touch untracked_file $ rm r1 hide error messages to avoid changing the output when the text changes $ hg purge -p 2> /dev/null untracked_file $ hg st ! r1 ? untracked_file $ hg purge -p untracked_file $ hg purge -v 2> /dev/null removing file untracked_file $ hg st ! r1 $ hg purge -v $ hg revert --all --quiet $ hg st -a tracked file in ignored directory (issue621) $ echo directory >> .hgignore $ hg ci -m 'ignore directory' $ touch untracked_file $ hg purge -p untracked_file $ hg purge -v removing file untracked_file skip excluded files $ touch excluded_file $ hg purge -p -X excluded_file $ hg purge -v -X excluded_file $ ls directory excluded_file r1 $ rm excluded_file skip files in excluded dirs $ mkdir excluded_dir $ touch excluded_dir/file $ hg purge -p -X excluded_dir $ hg purge -v -X excluded_dir $ ls directory excluded_dir r1 $ ls excluded_dir file $ rm -R excluded_dir skip excluded empty dirs $ mkdir excluded_dir $ hg purge -p -X excluded_dir $ hg purge -v -X excluded_dir $ ls directory excluded_dir r1 $ rmdir excluded_dir skip patterns $ mkdir .svn $ touch .svn/foo $ mkdir directory/.svn $ touch directory/.svn/foo $ hg purge -p -X .svn -X '*/.svn' $ hg purge -p -X re:.*.svn $ rm -R .svn directory r1 only remove files $ mkdir -p empty_dir dir $ touch untracked_file dir/untracked_file $ hg purge -p --files dir/untracked_file untracked_file $ hg purge -v --files removing file dir/untracked_file removing file untracked_file $ ls dir empty_dir $ ls dir only remove dirs $ mkdir -p empty_dir dir $ touch untracked_file dir/untracked_file $ hg purge -p --dirs empty_dir $ hg purge -v --dirs removing directory empty_dir $ ls dir untracked_file $ ls dir untracked_file remove both files and dirs $ mkdir -p empty_dir dir $ touch untracked_file dir/untracked_file $ hg purge -p --files --dirs dir/untracked_file untracked_file empty_dir $ hg purge -v --files --dirs removing file dir/untracked_file removing file untracked_file removing directory empty_dir removing directory dir $ ls $ cd ..