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Re: how to localise a problem?

by pvaldes (Chaplain)
on Nov 27, 2012 at 10:56 UTC ( #1005839=note: print w/replies, xml ) Need Help??

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

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Re^2: how to localise a problem?
by Dave Howorth (Scribe) on Nov 27, 2012 at 12:24 UTC

    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 $@;

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