view: more culling for search threads

{mapping} overhead is now down to ~1.3M at the end of
a giant thread from hell.

1 files changed, 8 insertions, 2 deletions

diff --git a/lib/PublicInbox/View.pm b/lib/PublicInbox/View.pm
index 5ddb8425..cd125e00 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) {