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qwurx [shmem] ~> perl 574821.pl 6000 7000 10000
Array size: 10000
...
           Rate splicing  radiant
splicing 46.8/s       --     -66%
radiant   137/s     193%       --

# called as insert1( \@ary, 1, $_ ) for $START .. $END
sub insert1 {
...
  @$ra = @$ra[0 .. $index-1], $elem, @$ra[$index .. @$ra-1];
}
# called as insert1( \@ary, 1, $_ ) for $START .. $END

qwurx [shmem] ~> perl 574821.pl 600 700 1000 
Array size: 1000
...
           Rate  radiant splicing
radiant  30.5/s       --     -98%
splicing 1672/s    5377%       --

$ perl -v
This is perl, v5.8.8 built for i586-linux-thread-multi
...