Re: perlfaq3: How can I make my Perl program run faster?

Robert Spier wrote in perl.documentation :
>> * explicity say that sfio may outperform stdio, since perl now
>> has perlio
> 
> Is this still accurate?  I think the new perlio layer stuff pretty
> much invalidates everything else.

Apparently yes (look up 'sfio' in the INSTALL file in bleadperl) :

    With the PerlIO abstraction layer, there is another possibility for
    the underlying IO calls, AT&T's "sfio".  This has superior performance
    to stdio.h in many cases [...]

    If you have already selected -Duseperlio, and if Configure detects
    that you have sfio, then sfio will be the default suggested by
    Configure.

> Does sfio still actually work at all?

I don't know. No sfio here, and I'm not aware of smoke-testers that use
it.