Mercurial > hg
view tests/test-convert-authormap.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 | a0cbbf78c31a |
children | 4441705b7111 |
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$ cat >> $HGRCPATH <<EOF > [extensions] > convert= > EOF Prepare orig repo $ hg init orig $ cd orig $ echo foo > foo $ HGUSER='user name' hg ci -qAm 'foo' $ cd .. Explicit --authors $ cat > authormap.txt <<EOF > user name = Long User Name > > # comment > this line is ignored > EOF $ hg convert --authors authormap.txt orig new initializing destination new repository ignoring bad line in author map file authormap.txt: this line is ignored scanning source... sorting... converting... 0 foo writing author map file $TESTTMP/new/.hg/authormap (glob) $ cat new/.hg/authormap user name=Long User Name $ hg -Rnew log changeset: 0:d89716e88087 tag: tip user: Long User Name date: Thu Jan 01 00:00:00 1970 +0000 summary: foo $ rm -rf new Implicit .hg/authormap $ hg init new $ mv authormap.txt new/.hg/authormap $ hg convert orig new ignoring bad line in author map file $TESTTMP/new/.hg/authormap: this line is ignored (glob) scanning source... sorting... converting... 0 foo $ hg -Rnew log changeset: 0:d89716e88087 tag: tip user: Long User Name date: Thu Jan 01 00:00:00 1970 +0000 summary: foo