I've found that a major hotspot is in a read loop where results are being read in and unpacked:

my @row = unpack("FFFFL", $tchandle->get($curdate));

I bet if you wrote that as: 

my $packed = $tchandle->get($curdate);
my @row = unpack("FFFFL", $packed );

[download]

and re-profiled, you'd find that it was the first line consuming the time, not the second.

Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
"Science is about questioning the status quo. Questioning authority".
In the absence of evidence, opinion is indistinguishable from prejudice.
RIP an inspiration; A true Folk's Guy

In reply to Re: How do I unpack Perl floats in C by BrowserUk
in thread How do I unpack Perl floats in C by Anonymous Monk

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