undef/git-commit-vandalism
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

git-svn: reload RA every log-window-size

Browse Source 
Despite attempting to use local memory pools everywhere we can,
(including our call to SVN::Ra::do_update and all subsequent reporter
calls), there does not appear to be a way to force the Git::SVN::Fetcher
callbacks to use a pool other than the per-SVN::Ra pool.
Git::SVN::Fetcher ends up using the main RA pool which grows
monotonically in size for the lifetime of the RA object.

Thus the only way to free that memory appears to be to destroy and
recreate the RA connection for at every --log-window-size interval.

This reduces memory usage over the course of fetching 10K revisions
using a test repository created with the script at the end of this
commit message.

As reported by time(1) on my x86-64 system:

	before: 54024k
	 after: 28680k

Unfortunately, there remains some yet-to-be-tracked-down slow memory
growth which would be evident as the `nr' parameter increases in
the repository generation script:
-----------------------------8<------------------------------
set -e
tmp=$(mktemp -d svntestrepo-XXXXXXXX)
svnadmin create "$tmp"
repo=file://"$(cd $tmp && pwd)"
svn co "$repo" "$tmp/wd"
cd "$tmp/wd"
if ! test -f a
then
	> a
	svn add a
	svn commit -m 'A'
fi

nr=10000
while test $nr -gt 0
do
	echo $nr > a
	svn commit -q -m A
	nr=$((nr - 1))
done
echo "repository created in $repo"
-----------------------------8<------------------------------

Signed-off-by: Eric Wong <normalperson@yhbt.net>
This commit is contained in:
Eric Wong 2014-10-24 22:53:52 +00:00
parent f947ae4b65
commit dfa72fdb96
1 changed files with 13 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

21
perl/Git/SVN/Ra.pm
View File

@ -376,10 +376,19 @@ sub longest_common_path {
sub gs_fetch_loop_common {
my ($self, $base, $head, $gsv, $globs) = @_;
return if ($base > $head);
my $gpool = SVN::Pool->new_default;
my $ra_url = $self->url;
my $reload_ra = sub {
$_[0] = undef;
$self = undef;
$RA = undef;
$gpool->clear;
$self = Git::SVN::Ra->new($ra_url);
$ra_invalid = undef;
};
my $inc = $_log_window_size;
my ($min, $max) = ($base, $head < $base + $inc ? $head : $base + $inc);
my $longest_path = longest_common_path($gsv, $globs);
my $ra_url = $self->url;
my $find_trailing_edge;
while (1) {
my %revs;
@ -449,13 +458,7 @@ sub gs_fetch_loop_common {
"$g->{t}-maxRev";
Git::SVN::tmp_config($k, $r);
}
if ($ra_invalid) {
$_[0] = undef;
$self = undef;
$RA = undef;
$self = Git::SVN::Ra->new($ra_url);
$ra_invalid = undef;
}
$reload_ra->() if $ra_invalid;
}
# pre-fill the .rev_db since it'll eventually get filled in
# with '0' x40 if something new gets committed
@ -472,6 +475,8 @@ sub gs_fetch_loop_common {
$min = $max + 1;
$max += $inc;
$max = $head if ($max > $head);
$reload_ra->();
}
Git::SVN::gc();
}