Mercurial > hg
view tests/test-unbundlehash.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 | 6e375ba01b04 |
children | b4b7427b5786 |
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#require killdaemons Test wire protocol unbundle with hashed heads (capability: unbundlehash) $ cat << EOF >> $HGRCPATH > [devel] > # This tests is intended for bundle1 only. > # bundle2 carries the head information inside the bundle itself and > # always uses 'force' as the heads value. > legacy.exchange = bundle1 > EOF Create a remote repository. $ hg init remote $ hg serve -R remote --config web.push_ssl=False --config web.allow_push=* -p $HGPORT -d --pid-file=hg1.pid -E error.log -A access.log $ cat hg1.pid >> $DAEMON_PIDS Clone the repository and push a change. $ hg clone http://localhost:$HGPORT/ local no changes found updating to branch default 0 files updated, 0 files merged, 0 files removed, 0 files unresolved $ touch local/README $ hg ci -R local -A -m hoge adding README $ hg push -R local pushing to http://localhost:$HGPORT/ searching for changes remote: adding changesets remote: adding manifests remote: adding file changes remote: added 1 changesets with 1 changes to 1 files Ensure hashed heads format is used. The hash here is always the same since the remote repository only has the null head. $ cat access.log | grep unbundle * - - [*] "POST /?cmd=unbundle HTTP/1.1" 200 - x-hgarg-1:heads=686173686564+6768033e216468247bd031a0a2d9876d79818f8f* (glob) Explicitly kill daemons to let the test exit on Windows $ killdaemons.py