This got me to thinking so I took your original code and made a few modifications just to see what it would do.
#!/usr/bin/perl
use strict;
use warnings;
use Benchmark("cmpthese");
my $i = 1;
cmpthese(-1, {
"double", q !eval q {$a = "this is a string $i"}!,
'single', q !eval q {$b = 'this is a string $i'}!,
});
seeker:perl$> ./quotes.pl
Rate double single
double 11712/s -- -34%
single 17742/s 51% --
seeker:perl$> ./quotes.pl
Rate double single
double 11487/s -- -30%
single 16377/s 43% --
seeker:perl$> ./quotes.pl
Rate double single
double 11270/s -- -32%
single 16592/s 47% --
seeker:perl$> ./quotes.pl
Rate double single
double 11395/s -- -33%
single 16905/s 48% --
seeker:perl$> ./quotes.pl
Rate double single
double 11894/s -- -33%
single 17742/s 49% --
seeker:perl$> ./quotes.pl
Rate double single
double 11487/s -- -32%
single 16853/s 47% --
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