You need the Schwartzian Transform

I'd say it's doubtful. Clearly, stat is slow, but it's not a slouch, and the Schwartz Transform adds its own overhead. I suspect the sweet spot where the ST pulls ahead is higher than you think.

If we want to pursue this approach, an improvement will be to employ a Guttman-Rosler Transform:

my @sorted =
    map substr($_, 4) =>
    sort
    map pack(`L',$_) . $_ => @files;
    # but see eyepopslikeamosquito's comment below

[download]

By being able to dip down and call the sort function without a code block will show greater benefits. With the proviso that one might have to pack with 8 byte 'Q' quads, for systems with filesizes larger than 2Gb.

With that in mind, it's probably all premature optimisation. I would wait until the snippet showed itself as being a performance pig before going to all this bother:

    sort { -s $a <=> -s $b } @files

[download]

... does have the distinct advantage of being eminently readable.

- another intruder with the mooring of the heat of the Perl

In reply to Re^2: Sorting based on filesize. by grinder
in thread Sorting based on filesize. by heigold1

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