comment on

There is one single characteristic that is significantly improving your performance. The lack of ithreads support. From your print outs:

The "fast baby":

Characteristics of this binary (from libperl):
  Compile-time options: MULTIPLICITY USE_LARGE_FILES PERL_IMPLICIT_CON
+TEXT
[download]

and the installed version:

Characteristics of this binary (from libperl):
  Compile-time options: MULTIPLICITY USE_ITHREADS USE_LARGE_FILES PERL
+_IMPLICIT_CONTEXT
[download]

The gain from removing threads can vary between 10-40% in the tests we've done. However, you are not comparing like for like. The installed version is based on 5.8.0 and your fast version is based on 5.8.5.

Unfortunately RH, and probably several other distros, come with a threaded Perl. Even though when 5.8.0 was released, ithreads were not recommended for production environments. From what I understand, ithreads support is much more stable now.

--
Barbie | Birmingham Perl Mongers user group | http://birmingham.pm.org/

In reply to The magic of threads by barbie
in thread How to make your Perl 30% faster by PetaMem

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