[PATCH 7/7] view: more culling for search threads

[Eric Wong <e@80x24.org>]

{mapping} overhead is now down to ~1.3M at the end of
a giant thread from hell.
---
 lib/PublicInbox/Inbox.pm        |  5 +++--
 lib/PublicInbox/SearchThread.pm |  5 +++++
 lib/PublicInbox/View.pm         | 10 ++++++++--
 3 files changed, 16 insertions(+), 4 deletions(-)

diff --git a/lib/PublicInbox/Inbox.pm b/lib/PublicInbox/Inbox.pm
index 73f5761..d57e46d 100644
--- a/lib/PublicInbox/Inbox.pm
+++ b/lib/PublicInbox/Inbox.pm
@@ -302,8 +302,9 @@ sub smsg_by_mid ($$) {
 	my ($self, $mid) = @_;
 	my $srch = search($self) or return;
 	# favor the Message-ID we used for the NNTP article number:
-	my $num = mid2num($self, $mid);
-	defined $num ? $srch->lookup_article($num) : undef;
+	defined(my $num = mid2num($self, $mid)) or return;
+	my $smsg = $srch->lookup_article($num) or return;
+	PublicInbox::SearchMsg::psgi_cull($smsg);
 }
 
 sub msg_by_mid ($$;$) {
diff --git a/lib/PublicInbox/SearchThread.pm b/lib/PublicInbox/SearchThread.pm
index be29098..931bd57 100644
--- a/lib/PublicInbox/SearchThread.pm
+++ b/lib/PublicInbox/SearchThread.pm
@@ -53,6 +53,11 @@ sub _add_message ($$) {
 	my $this = _get_cont_for_id($id_table, $smsg->{mid});
 	$this->{smsg} = $smsg;
 
+	# saves around 4K across 1K messages
+	# TODO: move this to a more appropriate place, breaks tests
+	# if we do it during psgi_cull
+	delete $smsg->{num};
+
 	# B. For each element in the message's References field:
 	defined(my $refs = $smsg->{references}) or return;
 
diff --git a/lib/PublicInbox/View.pm b/lib/PublicInbox/View.pm
index 5ddb842..cd125e0 100644
--- a/lib/PublicInbox/View.pm
+++ b/lib/PublicInbox/View.pm
@@ -219,7 +219,10 @@ sub index_entry {
 	$rv .= _th_index_lite($mid_raw, \$irt, $id, $ctx);
 	my @tocc;
 	my $ds = $smsg->ds; # for v1 non-Xapian/SQLite users
-	my $mime = delete $smsg->{mime}; # critical to memory use
+	# deleting {mime} is critical to memory use,
+	# the rest of the fields saves about 400K as we iterate across 1K msgs
+	my ($mime) = delete @$smsg{qw(mime ds ts blob subject)};
+
 	my $hdr = $mime->header_obj;
 	my $from = _hdr_names_html($hdr, 'From');
 	obfuscate_addrs($obfs_ibx, $from) if $obfs_ibx;
@@ -311,7 +314,10 @@ sub _th_index_lite {
 	my $nr_s = 0;
 	my $siblings;
 	if (my $smsg = $node->{smsg}) {
-		($$irt) = (($smsg->{references} || '') =~ m/<([^>]+)>\z/);
+		# delete saves about 200KB on a 1K message thread
+		if (my $refs = delete $smsg->{references}) {
+			($$irt) = ($refs =~ m/<([^>]+)>\z/);
+		}
 	}
 	my $irt_map = $mapping->{$$irt} if defined $$irt;
 	if (defined $irt_map) {
-- 
EW