From: manjian2006 <manjian2006@xxxxxxxxx>
* perl/Git/SVN.pm
Modified according to Eric Wong <normalperson@xxxxxxxx>
>Hi, I'm interested in this. How much did performance improve by
>(and how many revisions is the repository)>
Our svn server are built in a LAN,15152 revisions.Not optimized git-svn used 10 hours or more to accomplish,
while optimized one using only 3-4 hours.
According to some profiling data,_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.
Signed-off-by: manjian2006 <manjian2006@xxxxxxxxx>
---
perl/Git/SVN.pm | 41 ++++++++++++++++++++++++++++++++++++++---
1 file changed, 38 insertions(+), 3 deletions(-)
diff --git a/perl/Git/SVN.pm b/perl/Git/SVN.pm
index 5273ee8..dc7942b 100644
--- a/perl/Git/SVN.pm
+++ b/perl/Git/SVN.pm
@@ -1599,6 +1599,7 @@ 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,
"$cache_path/lookup_svn_merge");
@@ -1620,6 +1621,14 @@ sub tie_for_persistent_memoization {
SCALAR_CACHE => ['HASH' => \%has_no_changes_cache],
LIST_CACHE => 'FAULT',
;
+
+ tie_for_persistent_memoization(\%_rev_list_cache,
+ "$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: $!";
}
+#define a global associate map to record rebuild status
+my %rebuild_status;
+#define a global associate map to record rebuild verify status
+my %rebuild_verify_status;
+
sub rebuild {
my ($self) = @_;
my $map_path = $self->map_path;
my $partial = (-e $map_path && ! -z $map_path);
- return unless ::verify_ref($self->refname.'^0');
+ my $verify_key = $self->refname.'^0';
+ if (! exists $rebuild_verify_status{$verify_key} || ! defined $rebuild_verify_status{$verify_key} ) {
+ my $verify_result = ::verify_ref($verify_key);
+ if ($verify_result) {
+ $rebuild_verify_status{$verify_key} = 1;
+ }
+ }
+ if (! exists $rebuild_verify_status{$verify_key}) {
+ 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 $key_value = ($head ? "$head.." : "") . $self->refname;
+ if (exists $rebuild_status{$key_value}) {
+ 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,
+ command_output_pipe(qw/rev-list --pretty=raw --reverse/,
+ $key_value,
'--');
+ $rebuild_status{$key_value} = 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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