user/dev discussion of public-inbox itself
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From: Eric Wong <e@yhbt.net>
To: meta@public-inbox.org
Subject: [PATCH 02/11] gzipfilter: lazy allocate the deflate context
Date: Sat, 21 Mar 2020 02:03:45 +0000
Message-ID: <20200321020354.9056-3-e@yhbt.net> (raw)
In-Reply-To: <20200321020354.9056-1-e@yhbt.net>

zlib contexts are memory-intensive, particularly when used for
compression.  Since the gzip filter may be sitting in a limiter
queue for a long period, delay the allocation we actually have
data to translate, and not a moment sooner.
---
 lib/PublicInbox/GzipFilter.pm | 15 ++++++++++-----
 1 file changed, 10 insertions(+), 5 deletions(-)

diff --git a/lib/PublicInbox/GzipFilter.pm b/lib/PublicInbox/GzipFilter.pm
index d883130f..86409586 100644
--- a/lib/PublicInbox/GzipFilter.pm
+++ b/lib/PublicInbox/GzipFilter.pm
@@ -8,11 +8,7 @@ use bytes (); # length
 use Compress::Raw::Zlib qw(Z_FINISH Z_OK);
 my %OPT = (-WindowBits => 15 + 16, -AppendOutput => 1);
 
-sub new {
-	my ($gz, $err) = Compress::Raw::Zlib::Deflate->new(%OPT);
-	$err == Z_OK or die "Deflate->new failed: $err";
-	bless { gz => $gz }, shift;
-}
+sub new { bless {}, shift }
 
 # for Qspawn if using $env->{'pi-httpd.async'}
 sub attach {
@@ -24,6 +20,15 @@ sub attach {
 # for GetlineBody (via Qspawn) when NOT using $env->{'pi-httpd.async'}
 sub translate ($$) {
 	my $self = $_[0];
+
+	# allocate the zlib context lazily here, instead of in ->new.
+	# Deflate contexts are memory-intensive and this object may
+	# be sitting in the Qspawn limiter queue for a while.
+	my $gz = $self->{gz} ||= do {
+		my ($g, $err) = Compress::Raw::Zlib::Deflate->new(%OPT);
+		$err == Z_OK or die "Deflate->new failed: $err";
+		$g;
+	};
 	my $zbuf = delete($self->{zbuf});
 	if (defined $_[1]) { # my $buf = $_[1];
 		my $err = $self->{gz}->deflate($_[1], $zbuf);

  parent reply index

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-03-21  2:03 [PATCH 00/11] www: export SQLite altid dumps Eric Wong
2020-03-21  2:03 ` [PATCH 01/11] qspawn: reinstate filter support, add gzip filter Eric Wong
2020-03-21  2:03 ` Eric Wong [this message]
2020-03-21  2:03 ` [PATCH 03/11] wwwstream: introduce oneshot API to avoid ->getline Eric Wong
2020-03-21  2:03 ` [PATCH 04/11] extmsg: use WwwResponse::oneshot Eric Wong
2020-03-21  2:03 ` [PATCH 05/11] wwwstream: oneshot sets content-length Eric Wong
2020-03-21  2:03 ` [PATCH 06/11] mbox: need_gzip uses WwwStream::oneshot Eric Wong
2020-03-21  2:03 ` [PATCH 07/11] qspawn: handle ENOENT (and other errors on exec) Eric Wong
2020-03-21  2:03 ` [PATCH 08/11] search: clobber -user_pfx on query parser initialization Eric Wong
2020-03-21  2:03 ` [PATCH 09/11] wwwtext: show thread endpoint w/ indexlevel=basic Eric Wong
2020-03-21  2:03 ` [PATCH 10/11] altid: warn about non-word prefixes Eric Wong
2020-03-21  2:03 ` [PATCH 11/11] www: add endpoint to retrieve altid dumps Eric Wong

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