use Benchmark qw(timethese);

timethese( -2, {
  Ordinary => q{
    my @results = sort { -s $a <=> -s $b } glob "/bin/*";
  },
  Schwartzian => q{
    my @sorted =
      map $_->[0],
      sort { $a->[1] <=> $b->[1] }
      map [$_, -s $_],
      glob "/bin/*";
  },
});

##</code><code>##

  Ordinary:  2 wallclock secs ( 0.61 usr +  1.64 sys =  2.25 CPU) @ 237.78/s (n=535)
Schwartzian:  2 wallclock secs ( 1.52 usr +  0.76 sys =  2.28 CPU) @ 202.19/s (n=461)

##</code><code>##

Benchmark: timing 5000 iterations of Ordinary, Schwartzian...
  Ordinary: 21 wallclock secs ( 6.46 usr + 14.78 sys = 21.24 CPU) @ 235.40/s (n=5000)
Schwartzian: 26 wallclock secs (17.15 usr +  8.45 sys = 25.60 CPU) @ 195.31/s (n=5000)

##</code><code>##

Linux dell 2.6.5-7.104-smp #1 SMP Wed Jul 28 16:42:13 UTC 2004 i686 i686 i386 GNU/Linux

##</code><code>##


Summary of my perl5 (revision 5.0 version 8 subversion 3) configuration:
  Platform:
    osname=linux, osvers=2.6.4, archname=i586-linux-thread-multi
    uname='linux d209 2.6.4 #1 smp thu mar 11 17:56:49 utc 2004 i686 i686 i386 gnulinux '
config_args='-ds -e -Dprefix=/usr -Dvendorprefix=/usr -Dinstallusrbinperl
-Dusethreads -Di_db -Di_dbm -Di_ndbm -Di_gdbm -Duseshrplib=true -Doptimize=-O2 -march=i586
 -mcpu=i686 -fmessage-length=0 -Wall -Wall -pipe'
    hint=recommended, useposix=true, d_sigaction=define
    usethreads=define use5005threads=undef useithreads=define usemultiplicity=define
    useperlio=define d_sfio=undef uselargefiles=define usesocks=undef
    use64bitint=undef use64bitall=undef uselongdouble=undef
    usemymalloc=n, bincompat5005=undef
  Compiler:
    cc='cc', ccflags ='-D_REENTRANT -D_GNU_SOURCE -DTHREADS_HAVE_PIDS -fno-strict-aliasing -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64',
    optimize='-O2 -march=i586 -mcpu=i686 -fmessage-length=0 -Wall -Wall -pipe',
    cppflags='-D_REENTRANT -D_GNU_SOURCE -DTHREADS_HAVE_PIDS -fno-strict-aliasing'
    ccversion='', gccversion='3.3.3 (SuSE Linux)', gccosandvers=''
    intsize=4, longsize=4, ptrsize=4, doublesize=8, byteorder=1234
    d_longlong=define, longlongsize=8, d_longdbl=define, longdblsize=12
    ivtype='long', ivsize=4, nvtype='double', nvsize=8, Off_t='off_t', lseeksize=8
    alignbytes=4, prototype=define
  Linker and Libraries:
    ld='cc', ldflags =''
    libpth=/lib /usr/lib /usr/local/lib
    libs=-lnsl -ldl -lm -lcrypt -lutil -lpthread -lc
    perllibs=-lnsl -ldl -lm -lcrypt -lutil -lpthread -lc
    libc=, so=so, useshrplib=true, libperl=libperl.so
    gnulibc_version='2.3.3'
  Dynamic Linking:
    dlsrc=dl_dlopen.xs, dlext=so, d_dlsymun=undef, ccdlflags='-rdynamic -Wl,-rpath,/usr/lib/perl5/5.8.3/i586-linux-thread-multi/CORE'
    cccdlflags='-fPIC', lddlflags='-shared'


Characteristics of this binary (from libperl):
  Compile-time options: MULTIPLICITY USE_ITHREADS USE_LARGE_FILES PERL_IMPLICIT_CONTEXT
  Built under linux
  Compiled at Apr  3 2004 00:52:08
  @INC:
    /usr/lib/perl5/5.8.3/i586-linux-thread-multi
    /usr/lib/perl5/5.8.3
    /usr/lib/perl5/site_perl/5.8.3/i586-linux-thread-multi
    /usr/lib/perl5/site_perl/5.8.3
    /usr/lib/perl5/site_perl
    /usr/lib/perl5/vendor_perl/5.8.3/i586-linux-thread-multi
    /usr/lib/perl5/vendor_perl/5.8.3
    /usr/lib/perl5/vendor_perl