* [PATCH] remove hard Devel::Peek dependency and lazy load for daemons
@ 2019-05-15 10:57 Eric Wong
0 siblings, 0 replies; only message in thread
From: Eric Wong @ 2019-05-15 10:57 UTC (permalink / raw
To: meta
It's only useful for a corner case in long-running daemons when
an admin decides to compact or vacuum a Xapian or SQLite DB.
As a result, other scripts should run slightly faster. For
instance, this saves about 80ms (2.710s => 2.630s) in t/mda.t
on my remote workstation.
While we're at it, make sure EvCleanup is properly require'd
in Daemon.pm and HTTP.pm and document our use of Devel::Peek.
---
INSTALL | 11 +++++-----
Makefile.PL | 4 ----
lib/PublicInbox/Daemon.pm | 3 ++-
lib/PublicInbox/HTTP.pm | 1 +
lib/PublicInbox/Inbox.pm | 45 ++++++++++++++++++++++++++++-----------
t/config_limiter.t | 1 -
6 files changed, 41 insertions(+), 24 deletions(-)
diff --git a/INSTALL b/INSTALL
index 313a295..8343762 100644
--- a/INSTALL
+++ b/INSTALL
@@ -36,11 +36,6 @@ Beyond that, there is a long list of Perl modules required, starting with:
pkg: p5-TimeDate
rpm: perl-TimeDate
-* Devel::Peek deb: libperl5.$MINOR (e.g. libperl5.24)
- pkg: perl5
- rpm: perl-Devel-Peek
- (typically installed alongside Perl5)
-
* Email::MIME deb: libemail-mime-perl
pkg: p5-Email-MIME
rpm: perl-Email-MIME
@@ -125,6 +120,12 @@ above, so there is no need to explicitly install them:
rpm: perl-DBI
(pulled in by DBD::SQLite)
+* Devel::Peek deb: libperl5.$MINOR (e.g. libperl5.24)
+ pkg: perl5
+ rpm: perl-Devel-Peek
+ (optional for stale FD cleanup in daemons,
+ typically installed alongside Perl5)
+
- Filesys::Notify::Simple deb: libfilesys-notify-simple-perl
pkg: pkg-Filesys-Notify-Simple
rpm: perl-Filesys-Notify-Simple
diff --git a/Makefile.PL b/Makefile.PL
index 6be913b..de0c49f 100644
--- a/Makefile.PL
+++ b/Makefile.PL
@@ -38,10 +38,6 @@ WriteMakefile(
# `perl5' on FreeBSD
'Encode' => 0,
- # libperl$PERL_VERSION on Debian, `perl5' on FreeBSD,
- # but Fedora seems to need this separately
- 'Devel::Peek' => 0,
-
# TODO: these should really be made optional...
'Plack' => 0,
'URI::Escape' => 0,
diff --git a/lib/PublicInbox/Daemon.pm b/lib/PublicInbox/Daemon.pm
index 68ba987..227ba5f 100644
--- a/lib/PublicInbox/Daemon.pm
+++ b/lib/PublicInbox/Daemon.pm
@@ -13,6 +13,7 @@ use Time::HiRes qw(clock_gettime CLOCK_MONOTONIC);
STDOUT->autoflush(1);
STDERR->autoflush(1);
require PublicInbox::DS;
+require PublicInbox::EvCleanup;
require POSIX;
require PublicInbox::Listener;
require PublicInbox::ParentPipe;
@@ -463,6 +464,7 @@ sub master_loop {
sub daemon_loop ($$) {
my ($refresh, $post_accept) = @_;
+ PublicInbox::EvCleanup::enable(); # early for $refresh
my $parent_pipe;
if ($worker_processes > 0) {
$refresh->(); # preload by default
@@ -485,7 +487,6 @@ sub daemon_loop ($$) {
@listeners = map {
PublicInbox::Listener->new($_, $post_accept)
} @listeners;
- PublicInbox::EvCleanup::enable();
PublicInbox::DS->EventLoop;
$parent_pipe = undef;
}
diff --git a/lib/PublicInbox/HTTP.pm b/lib/PublicInbox/HTTP.pm
index 11bd241..10e6d6a 100644
--- a/lib/PublicInbox/HTTP.pm
+++ b/lib/PublicInbox/HTTP.pm
@@ -18,6 +18,7 @@ use Plack::HTTPParser qw(parse_http_request); # XS or pure Perl
use HTTP::Status qw(status_message);
use HTTP::Date qw(time2str);
use IO::Handle;
+require PublicInbox::EvCleanup;
use constant {
CHUNK_START => -1, # [a-f0-9]+\r\n
CHUNK_END => -2, # \r\n
diff --git a/lib/PublicInbox/Inbox.pm b/lib/PublicInbox/Inbox.pm
index 76aeefb..0b118b2 100644
--- a/lib/PublicInbox/Inbox.pm
+++ b/lib/PublicInbox/Inbox.pm
@@ -7,25 +7,30 @@ use strict;
use warnings;
use PublicInbox::Git;
use PublicInbox::MID qw(mid2path);
-use Devel::Peek qw(SvREFCNT);
use PublicInbox::MIME;
+# Long-running "git-cat-file --batch" processes won't notice
+# unlinked packs, so we need to restart those processes occasionally.
+# Xapian and SQLite file handles are mostly stable, but sometimes an
+# admin will attempt to replace them atomically after compact/vacuum
+# and we need to be prepared for that.
my $cleanup_timer;
-eval {
- $cleanup_timer = 'disabled';
- require PublicInbox::EvCleanup;
- $cleanup_timer = undef; # OK if we get here
-};
-my $cleanup_broken = $@;
-
+my $cleanup_avail = -1; # 0, or 1
+my $have_devel_peek;
my $CLEANUP = {}; # string(inbox) -> inbox
sub cleanup_task () {
$cleanup_timer = undef;
my $next = {};
for my $ibx (values %$CLEANUP) {
my $again;
- foreach my $f (qw(mm search)) {
- delete $ibx->{$f} if SvREFCNT($ibx->{$f}) == 1;
+ if ($have_devel_peek) {
+ foreach my $f (qw(mm search)) {
+ # we bump refcnt by assigning tmp, here:
+ my $tmp = $ibx->{$f} or next;
+ next if Devel::Peek::SvREFCNT($tmp) > 2;
+ delete $ibx->{$f};
+ # refcnt is zero when tmp is out-of-scope
+ }
}
my $expire = time - 60;
if (my $git = $ibx->{git}) {
@@ -36,16 +41,30 @@ sub cleanup_task () {
$again = 1 if $git->cleanup($expire);
}
}
- $again ||= !!($ibx->{mm} || $ibx->{search});
+ if ($have_devel_peek) {
+ $again ||= !!($ibx->{mm} || $ibx->{search});
+ }
$next->{"$ibx"} = $ibx if $again;
}
$CLEANUP = $next;
}
+sub cleanup_possible () {
+ # no need to require EvCleanup, here, if it were enabled another
+ # module would've require'd it, already
+ eval { PublicInbox::EvCleanup::enabled() } or return 0;
+
+ eval {
+ require Devel::Peek; # needs separate package in Fedora
+ $have_devel_peek = 1;
+ };
+ 1;
+}
+
sub _cleanup_later ($) {
my ($self) = @_;
- return if $cleanup_broken;
- return unless PublicInbox::EvCleanup::enabled();
+ $cleanup_avail = cleanup_possible() if $cleanup_avail < 0;
+ return if $cleanup_avail != 1;
$cleanup_timer ||= PublicInbox::EvCleanup::later(*cleanup_task);
$CLEANUP->{"$self"} = $self;
}
diff --git a/t/config_limiter.t b/t/config_limiter.t
index 85a7125..b18951a 100644
--- a/t/config_limiter.t
+++ b/t/config_limiter.t
@@ -38,7 +38,6 @@ my $cfgpfx = "publicinbox.test";
ok($lim, 'Limiter exists');
is($lim->{max}, 3, 'limiter has expected slots');
$ibx->{git} = undef;
- PublicInbox::Inbox::cleanup_task;
my $new = $ibx->git;
isnt($old, "$new", 'got new Git object');
is("$new->{-httpbackend_limiter}", "$lim", 'same limiter');
--
EW
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2019-05-15 10:57 [PATCH] remove hard Devel::Peek dependency and lazy load for daemons Eric Wong
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