* Perform builds in parallel.

* Turn off sqlite's synchronous mode because fsync() performance
  *really* sucks on ext3 (it syncs the entire filesystem).  See
  https://bugzilla.mozilla.org/show_bug.cgi?id=421482

src/HydraFrontend/root/index.tt

@@ -5,11 +5,12 @@
 
 <table class="tablesorter">
   <thead>
-    <tr><th>Priority</th><th>Project</th><th>Job</th><th>System</th><th>Timestamp</th><th>Description</th></tr>
+    <tr><th>#</th><th>Priority</th><th>Project</th><th>Job</th><th>System</th><th>Timestamp</th><th>Description</th></tr>
   </thead>
   <tbody>
     [% FOREACH job IN jobs -%]
       <tr [% IF job.busy %]class="runningJob"[% END %] >
+        <td>[% job.id %]</td>
         <td>[% job.priority %]</td>
         <td><tt>[% job.project.name %]</tt></td>
         <td><tt>[% job.jobset.name %]</tt></td>

src/build.pl

@@ -7,6 +7,8 @@ use HydraFrontend::Schema;
 
 my $db = HydraFrontend::Schema->connect("dbi:SQLite:dbname=hydra.sqlite", "", "", {});
 
+$db->storage->dbh->do("PRAGMA synchronous = OFF;");
+
 
 sub isValidPath {
     my $path = shift;
@@ -124,7 +126,10 @@ sub buildJob {
         }
 
         $job->delete;
+ 
     });
+
+    print "STOP ", time, "\n";
 }
 
 

src/runner.pl

@@ -1,11 +1,14 @@
 #! @perl@ -w
 
 use strict;
+use POSIX qw(dup2);
 use HydraFrontend::Schema;
 
 
 my $db = HydraFrontend::Schema->connect("dbi:SQLite:dbname=hydra.sqlite", "", "", {});
 
+$db->storage->dbh->do("PRAGMA synchronous = OFF;");
+
 
 # Unlock jobs whose building process has died.
 $db->txn_do(sub {
@@ -22,8 +25,7 @@ $db->txn_do(sub {
 });
 
 
-while (1) {
-
+sub checkJobs {
     print "looking for runnable jobs...\n";
 
     my $job;
@@ -46,9 +48,20 @@ while (1) {
     # Start the job.  We need to do this outside the transaction in
     # case it aborts or something.
     if (defined $job) {
-        print "starting job ", $job->id, "\n";
+        my $id = $job->id;
+        print "starting job $id\n";
         eval {
-            system("perl -I HydraFrontend/lib -w ./build.pl " . $job->id);
+            my $child = fork();
+            die unless defined $child;
+            if ($child == 0) {
+                open LOG, ">logs/$id" or die;
+                POSIX::dup2(fileno(LOG), 1) or die;
+                POSIX::dup2(fileno(LOG), 2) or die;
+                exec("perl", "-IHydraFrontend/lib", "-w",
+                     "./build.pl", $id);
+                warn "cannot start job " . $id;
+                _exit(1);
+            }
         };
         if ($@) {
             warn $@;
@@ -59,6 +72,14 @@ while (1) {
             });
         }
     }
+}
+
+
+while (1) {
+    eval {
+        checkJobs;
+    };
+    warn $@ if $@;
 
     print "sleeping...\n";
     sleep(10);

src/scheduler.pl

@@ -7,6 +7,8 @@ use HydraFrontend::Schema;
 
 my $db = HydraFrontend::Schema->connect("dbi:SQLite:dbname=hydra.sqlite", "", "", {});
 
+$db->storage->dbh->do("PRAGMA synchronous = OFF;");
+
 
 sub isValidPath {
     my $path = shift;
@@ -250,4 +252,8 @@ sub checkJobs {
 }
 
 
-checkJobs;
+while (1) {
+    checkJobs;
+    print "sleeping...\n";
+    sleep 10;
+}