with the main benefit seemingly coming from bypassing stdio

I just want to clarify what that means because to some people this may sound as if Perl IO is slow and it's always better to use sysread(). In the examples that BrowserUK++ provided, the main benefit comes from the fact that in case of sysread(), the code is looking at the data that is being read only once (plus a little overhead for looking for that last "\n"). In case of normal Perl IO, i.e, <FH>, every character is looked at twice -- first by Perl to figure out where each line ends, then by the code itself to split everything into separate fields. That's why you're seeing a ~50% increase in performance. You can also confirm this by checking the user and system times for normal Perl IO and sysread(). You'll see that system time is pretty much the same in both cases but user time will vary.

--perlplexer

In reply to Re: Re: split and sysread() by perlplexer
in thread split and sysread() by relaxed137

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