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Re^2: Efficient way to sum columns in a file

by Roy Johnson (Monsignor)
on Apr 13, 2005 at 20:40 UTC ( #447580=note: print w/replies, xml ) Need Help??


in reply to Re: Efficient way to sum columns in a file
in thread Efficient way to sum columns in a file

Although still slower than having separate variables for each column, this was a bit faster (and shorter) than your middle test:
time perl -nle'my $i=0;$a[$i++]+=$_ for (split/,/);END{print join "\t" +, @a}' numbers.csv
At only about 50% slower than the fastest solution, its brevity and adaptability might recommend it.

Caution: Contents may have been coded under pressure.

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[Corion]: I've also found some interesting invariants that I have to think/write about more. A simple rate limiter will never change the order of the input, while a limiter that allows for parallel execution will change the order. But my API currently allows for bo
[Corion]: ... for both, and I'm not sure if I want to add the cruft from the parallel API (a token that you need to hold on to while you hold the lock) to the rate limiting API too, to allow seamless up/downgrades, or not.
[Corion]: Also, rate limiting will look great with await: my $token = await $limiter-> limit($hostname); instead of my $f = $limiter->limit( $hostname )->then(sub { my( $token)=@_; ... });

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