This eliminates the temp %foo so it should reduce the memory overhead. It uses an array slice: 
for my $k (keys %columns) {
    @{$columns{$k}} = @{$columns{$k}}[@si];
}

[download]

--
John.

In reply to Re: Structure slogging: do my homework! :) by jmcnamara
in thread Structure slogging: do my homework! :) by clintp

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