sharedkv: use lock_for_scope_fast

This allows us to avoid repeated open() and close() syscalls
and speeds up the new xt/stress-sharedkv.t maintainer test
by roughly 7%.

1 files changed, 50 insertions, 0 deletions

diff --git a/xt/stress-sharedkv.t b/xt/stress-sharedkv.t
new file mode 100644
index 00000000..70de9ffc
--- /dev/null
+++ b/xt/stress-sharedkv.t
@@ -0,0 +1,50 @@
+# Copyright (C) 2021 all contributors <meta@public-inbox.org>
+# License: AGPL-3.0+ <https://www.gnu.org/licenses/agpl-3.0.txt>
+use strict;
+use v5.10.1;
+use Test::More;
+use Benchmark qw(:all);
+use PublicInbox::TestCommon;
+require_ok 'PublicInbox::SharedKV';
+my ($tmpdir, $for_destroy) = tmpdir();
+local $ENV{TMPDIR} = $tmpdir;
+my $skv = PublicInbox::SharedKV->new;
+my $ipc = bless {}, 'StressSharedKV';
+$ipc->wq_workers_start('stress-sharedkv', $ENV{TEST_NPROC}//4);
+my $nr = $ENV{TEST_STRESS_NR} // 100_000;
+my $ios = [];
+my $t = timeit(1, sub {
+        for my $i (1..$nr) {
+                $ipc->wq_do('test_set_maybe', $ios, $skv, $i);
+                $ipc->wq_do('test_set_maybe', $ios, $skv, $i);
+        }
+});
+diag "$nr sets done ".timestr($t);
+
+for my $w ($ipc->wq_workers) {
+        $ipc->wq_do('test_skv_done', $ios);
+}
+diag "done requested";
+
+$ipc->wq_close;
+done_testing;
+
+package StressSharedKV;
+use strict;
+use v5.10.1;
+use parent qw(PublicInbox::IPC);
+use Digest::SHA qw(sha1);
+
+sub test_set_maybe {
+        my ($self, $skv, $i) = @_;
+        my $wcb = $self->{wcb} //= do {
+                $skv->dbh;
+                sub { $skv->set_maybe(sha1($_[0]), '') };
+        };
+        $wcb->($i + time);
+}
+
+sub test_skv_done {
+        my ($self) = @_;
+        delete $self->{wcb};
+}