Also, higher optimization levels may start trading off time for space, which might make someone still running Perl on an old VAX angry.

Who is interested in an old VAX? ;-)

But now that you mention it: 
-rwxr-xr-x    2 root root   11588 2004-11-17 09:49 /opt/perl-5.8.0_t/bin/perl
-rwxr-xr-x    2 root root 1213952 2004-11-17 09:49 /usr/local/bin/perl
Which looks really weird for me in the first case.

Bye
 PetaMem     All Perl:   MT, NLP, NLU

In reply to Re^3: How to make your Perl 30% faster by PetaMem
in thread How to make your Perl 30% faster by PetaMem

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