From: linzj <li...@ucweb.com>
Hi,
I am trying to improve git svn's performance according to some profiling
data.As the data showed,_rev_list subroutine and rebuild subroutine are
consuming a large proportion of time.So I improve _rev_list's performance by
memoize its results,and avoid subprocess invocation by memoize rebuild
subroutine's key data.Here's my patch:
---
perl/Git/SVN.pm | 63 ++++++++++++++++++++++++++++++++++++++++++++-------------
1 file changed, 49 insertions(+), 14 deletions(-)
diff --git a/perl/Git/SVN.pm b/perl/Git/SVN.pm
index 5273ee8..3cd1c8f 100644
--- a/perl/Git/SVN.pm
+++ b/perl/Git/SVN.pm
@@ -1599,27 +1599,36 @@ sub tie_for_persistent_memoization {
my %lookup_svn_merge_cache;
my %check_cherry_pick_cache;
my %has_no_changes_cache;
+ my %_rev_list_cache;
tie_for_persistent_memoization(\%lookup_svn_merge_cache,
- "$cache_path/lookup_svn_merge");
+ "$cache_path/lookup_svn_merge");
memoize 'lookup_svn_merge',
- SCALAR_CACHE => 'FAULT',
- LIST_CACHE => ['HASH' => \%lookup_svn_merge_cache],
- ;
+ SCALAR_CACHE => 'FAULT',
+ LIST_CACHE => ['HASH' =>
\%lookup_svn_merge_cache],
+ ;
tie_for_persistent_memoization(\%check_cherry_pick_cache,
- "$cache_path/check_cherry_pick");
+ "$cache_path/check_cherry_pick");
memoize 'check_cherry_pick',
- SCALAR_CACHE => 'FAULT',
- LIST_CACHE => ['HASH' => \%check_cherry_pick_cache],
- ;
+ SCALAR_CACHE => 'FAULT',
+ LIST_CACHE => ['HASH' =>
\%check_cherry_pick_cache],
+ ;
tie_for_persistent_memoization(\%has_no_changes_cache,
- "$cache_path/has_no_changes");
+ "$cache_path/has_no_changes");
memoize 'has_no_changes',
- SCALAR_CACHE => ['HASH' => \%has_no_changes_cache],
- LIST_CACHE => 'FAULT',
- ;
+ SCALAR_CACHE => ['HASH' =>
\%has_no_changes_cache],
+ LIST_CACHE => 'FAULT',
+ ;
+
+ tie_for_persistent_memoization(\%_rev_list_cache,
+ "$cache_path/_rev_list");
+ memoize '_rev_list',
+ SCALAR_CACHE => 'FAULT',
+ LIST_CACHE => ['HASH' => \%_rev_list_cache],
+ ;
+
}
sub unmemoize_svn_mergeinfo_functions {
@@ -1629,6 +1638,7 @@ sub tie_for_persistent_memoization {
Memoize::unmemoize 'lookup_svn_merge';
Memoize::unmemoize 'check_cherry_pick';
Memoize::unmemoize 'has_no_changes';
+ Memoize::unmemoize '_rev_list';
}
sub clear_memoized_mergeinfo_caches {
@@ -1959,11 +1969,25 @@ sub rebuild_from_rev_db {
unlink $path or croak "unlink: $!";
}
+#define a global associate map to record rebuild status
+my %rebuildStatus;
+#define a global associate map to record rebuild verify status
+my %rebuildVerifyStatus;
+
sub rebuild {
my ($self) = @_;
my $map_path = $self->map_path;
my $partial = (-e $map_path && ! -z $map_path);
- return unless ::verify_ref($self->refname.'^0');
+ my $verifyKey = $self->refname.'^0';
+ if (! exists $rebuildVerifyStatus{$verifyKey} || ! defined
$rebuildVerifyStatus{$verifyKey} ) {
+ my $verifyResult = ::verify_ref($verifyKey);
+ if ($verifyResult) {
+ $rebuildVerifyStatus{$verifyKey} = 1;
+ }
+ }
+ if (! exists $rebuildVerifyStatus{$verifyKey}) {
+ return;
+ }
if (!$partial && ($self->use_svm_props || $self->no_metadata)) {
my $rev_db = $self->rev_db_path;
$self->rebuild_from_rev_db($rev_db);
@@ -1977,10 +2001,21 @@ sub rebuild {
print "Rebuilding $map_path ...\n" if (!$partial);
my ($base_rev, $head) = ($partial ? $self->rev_map_max_norebuild(1) :
(undef, undef));
+ my $keyValue = ($head ? "$head.." : "") . $self->refname;
+ if (exists $rebuildStatus{$keyValue}) {
+ print "Done rebuilding $map_path\n" if (!$partial || !$head);
+ my $rev_db_path = $self->rev_db_path;
+ if (-f $self->rev_db_path) {
+ unlink $self->rev_db_path or croak "unlink: $!";
+ }
+ $self->unlink_rev_db_symlink;
+ return;
+ }
my ($log, $ctx) =
command_output_pipe(qw/rev-list --pretty=raw --reverse/,
- ($head ? "$head.." : "") . $self->refname,
+ $keyValue,
'--');
+ $rebuildStatus{$keyValue} = 1;
my $metadata_url = $self->metadata_url;
remove_username($metadata_url);
my $svn_uuid = $self->rewrite_uuid || $self->ra_uuid;
--
1.8.3.2
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