I think you are going to need to supply more information for any of the monks here to provide a useful answer, like the version of Perl, the O/S you are using, and which system call is being made.
Be forewarned that I'll not be the only Monk asking: why do you have 250 GB of data in a hash?
Information about American English usage here and here. Floating point issues? Please read this before posting. — emc
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