Re: how to localise a problem?

[pvaldes]

in reply to how to localise a problem?

Grapviz is unable to manage very big plots normally, and crashes in this situation with a similar error message. This software does lots and lots of calculus repeatedly eating a lot of memory.

Can we see some code? You probably are using the wrong graphviz option

The binary is /usr/bin/dot

Ok, enough, wrong option. If your plot has more than 100 nodes try instead, sfdp

[Dave Howorth]

Thanks for that. Do you have any links to reports about Graphviz crashes with similar messages? That could be very helpful.

Most of my graphs are pretty small (less than ten nodes). And which one fails seems to be random, and more importantly, it works perfectly and is not unusual when it is retried. So I don't think it is a data-dependent Graphviz error. The dot files look sensible.

FWIW, here's where I mess with Graphviz

    $self->{graph} = GraphViz2->new(
                    global  => {
                        name    => 'fold_graph_map',
                    },
                    node    => {
                        fontsize => 10,
                        shape    => 'box',
                    },
                );

stuff adding nodes and edges omitted

    eval {
        $self->{graph}->run(format  => 'png');
        $png   = $self->{graph}->dot_output();
    };
    die "Failed to create png for node #$id:\n$@\n"
        . $self->{graph}->dot_input()
      if $@;