* In the build hook, if connecting to a machine fails, try the other
machines of the right type (if available). This makes the build farm more robust to failures.
This commit is contained in:
Eelco Dolstra
parent
f56a039775
commit
d0c32dc135
3 changed files with 83 additions and 79 deletions
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@ -71,6 +71,7 @@ while (<CONF>) {
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, sshKeys => $3
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, maxJobs => $4
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, speedFactor => 1.0 * ($6 || 1)
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, enabled => 1
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};
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}
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@ -92,89 +93,96 @@ sub openSlotLock {
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}
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# Find all machine that can execute this build, i.e., that support
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# builds for the given platform and are not at their job limit.
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my $rightType = 0;
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my @available = ();
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LOOP: foreach my $cur (@machines) {
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if (grep { $neededSystem eq $_ } @{$cur->{systemTypes}}) {
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$rightType = 1;
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my $hostName;
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# We have a machine of the right type. Determine the load on
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# the machine.
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my $slot = 0;
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my $load = 0;
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my $free;
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while ($slot < $cur->{maxJobs}) {
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my $slotLock = openSlotLock($cur, $slot);
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if (flock($slotLock, LOCK_EX | LOCK_NB)) {
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$free = $slot unless defined $free;
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flock($slotLock, LOCK_UN) or die;
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} else {
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$load++;
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while (1) {
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# Find all machine that can execute this build, i.e., that support
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# builds for the given platform and are not at their job limit.
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my $rightType = 0;
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my @available = ();
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LOOP: foreach my $cur (@machines) {
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if ($cur->{enabled} && grep { $neededSystem eq $_ } @{$cur->{systemTypes}}) {
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$rightType = 1;
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# We have a machine of the right type. Determine the load on
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# the machine.
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my $slot = 0;
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my $load = 0;
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my $free;
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while ($slot < $cur->{maxJobs}) {
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my $slotLock = openSlotLock($cur, $slot);
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if (flock($slotLock, LOCK_EX | LOCK_NB)) {
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$free = $slot unless defined $free;
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flock($slotLock, LOCK_UN) or die;
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} else {
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$load++;
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}
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close $slotLock;
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$slot++;
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}
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close $slotLock;
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$slot++;
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}
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push @available, { machine => $cur, load => $load, free => $free }
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push @available, { machine => $cur, load => $load, free => $free }
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if $load < $cur->{maxJobs};
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}
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}
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}
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if (defined $ENV{NIX_DEBUG_HOOK}) {
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print STDERR "load on " . $_->{machine}->{hostName} . " = " . $_->{load} . "\n"
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foreach @available;
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}
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# Didn't find any available machine? Then decline or postpone.
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if (scalar @available == 0) {
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# Postpone if we have a machine of the right type, except if the
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# local system can and wants to do the build.
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if ($rightType && !$canBuildLocally) {
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sendReply "postpone";
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exit 0;
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} else {
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decline;
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if (defined $ENV{NIX_DEBUG_HOOK}) {
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print STDERR "load on " . $_->{machine}->{hostName} . " = " . $_->{load} . "\n"
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foreach @available;
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}
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# Didn't find any available machine? Then decline or postpone.
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if (scalar @available == 0) {
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# Postpone if we have a machine of the right type, except if the
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# local system can and wants to do the build.
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if ($rightType && !$canBuildLocally) {
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sendReply "postpone";
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exit 0;
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} else {
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decline;
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}
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}
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# Prioritise the available machines as follows:
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# - First by load divided by speed factor, rounded to the nearest
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# integer. This causes fast machines to be preferred over slow
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# machines with similar loads.
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# - Then by speed factor.
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# - Finally by load.
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sub lf { my $x = shift; return int($x->{load} / $x->{machine}->{speedFactor} + 0.4999); }
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@available = sort
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{ lf($a) <=> lf($b)
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|| $b->{machine}->{speedFactor} <=> $a->{machine}->{speedFactor}
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|| $a->{load} <=> $b->{load}
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} @available;
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# Select the best available machine and lock a free slot.
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my $selected = $available[0];
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my $machine = $selected->{machine};
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my $slotLock = openSlotLock($machine, $selected->{free});
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flock($slotLock, LOCK_EX | LOCK_NB) or die;
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utime undef, undef, $slotLock;
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close MAINLOCK;
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# Connect to the selected machine.
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@sshOpts = ("-i", $machine->{sshKeys}, "-x");
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$hostName = $machine->{hostName};
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last if openSSHConnection $hostName;
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warn "unable to open SSH connection to $hostName, trying other available machines...\n";
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$machine->{enabled} = 0;
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}
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# Prioritise the available machines as follows:
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# - First by load divided by speed factor, rounded to the nearest
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# integer. This causes fast machines to be preferred over slow
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# machines with similar loads.
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# - Then by speed factor.
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# - Finally by load.
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sub lf { my $x = shift; return int($x->{load} / $x->{machine}->{speedFactor} + 0.4999); }
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@available = sort
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{ lf($a) <=> lf($b)
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|| $b->{machine}->{speedFactor} <=> $a->{machine}->{speedFactor}
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|| $a->{load} <=> $b->{load}
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} @available;
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# Select the best available machine and lock a free slot.
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my $selected = $available[0];
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my $machine = $selected->{machine};
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my $slotLock = openSlotLock($machine, $selected->{free});
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flock($slotLock, LOCK_EX | LOCK_NB) or die;
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utime undef, undef, $slotLock;
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close MAINLOCK;
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# Tell Nix we've accepted the build.
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sendReply "accept";
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if (defined $ENV{NIX_DEBUG_HOOK}) {
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my $hostName = $machine->{hostName};
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my $sp = $machine->{speedFactor};
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print STDERR "building `$drvPath' on `$hostName' - $sp - " . $selected->{free} . "\n";
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sleep 10;
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exit 0;
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}
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my $x = <STDIN>;
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chomp $x;
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@ -184,13 +192,8 @@ if ($x ne "okay") {
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# Do the actual build.
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my $hostName = $machine->{hostName};
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print STDERR "building `$drvPath' on `$hostName'\n";
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push @sshOpts, "-i", $machine->{sshKeys}, "-x";
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openSSHConnection $hostName;
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my $inputs = `cat inputs`; die if ($? != 0);
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$inputs =~ s/\n/ /g;
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@ -53,7 +53,7 @@ while (@ARGV) {
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}
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openSSHConnection $sshHost;
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openSSHConnection $sshHost or die "$0: unable to start SSH\n";
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if ($toMode) { # Copy TO the remote machine.
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@ -12,15 +12,16 @@ sub openSSHConnection {
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my ($host) = @_;
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die if $sshStarted;
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$sshHost = $host;
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return if system("ssh $sshHost @sshOpts -O check 2> /dev/null") == 0;
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return 1 if system("ssh $sshHost @sshOpts -O check 2> /dev/null") == 0;
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my $tmpDir = tempdir("nix-ssh.XXXXXX", CLEANUP => 1, TMPDIR => 1)
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or die "cannot create a temporary directory";
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push @sshOpts, "-S", "$tmpDir/control";
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system("ssh $sshHost @sshOpts -M -N -f") == 0
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or die "unable to start SSH: $?";
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or return 0;
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$sshStarted = 1;
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return 1;
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}
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# Tell the master SSH client to exit.
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