NixOS/hydra
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Use faster query to determine number of running builds

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The previous query

  select count(*) from builds b left join buildsteps s on s.build = b.id where busy = 1 and finished = 0

is suddenly taking several minutes. Probably PostgreSQL decided to use
a suboptimal query plan.
This commit is contained in:
Eelco Dolstra 2016-03-16 13:41:43 +01:00
parent 405a43c171
commit 520c8a5826
1 changed files with 2 additions and 3 deletions
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5
src/lib/Hydra/Controller/Root.pm
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@ -45,9 +45,8 @@ sub begin :Private {
} }
if (scalar(@args) == 0 || $args[0] ne "static") { if (scalar(@args) == 0 || $args[0] ne "static") {
$c->stash->{nrRunningBuilds} = $c->model('DB::Builds')->search( $c->stash->{nrRunningBuilds} = $c->model('DB')->schema->storage->dbh->selectrow_array(
{ finished => 0, 'buildsteps.busy' => 1 }, "select count(distinct build) from buildsteps where busy = 1");
{ join => 'buildsteps', select => ["id"], distinct => 1 })->count();
$c->stash->{nrQueuedBuilds} = $c->model('DB::Builds')->search({ finished => 0 })->count(); $c->stash->{nrQueuedBuilds} = $c->model('DB::Builds')->search({ finished => 0 })->count();
} }