I think you have the quotes a level too deep, 

    return `$conf | ./perl/tester.pl`;

[download]
You may be using the wrong quotes where you set $conf, but maybe not, I can't tell. You haven't described how those files are constructed and how they work together.

After Compline,
Zaxo

In reply to Re: benchmarking problem by Zaxo
in thread benchmarking problem by drawde83

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