Simon Miner wrote:
My company has just upgraded our Apache/mod_perl and supporting software versions, and we are now seeing a strange phenomenon. A piece of code which has always worked speedily up to this point, now occasionally, but predictably, takes 10 times longer to execute. The code fragment in question is this.
my $quoted_link = qr{ ... }
The first thing I'd do is check whether some code doesn't try to use $`, $&, and $', which are known to cause this kind of slowdown. See:
http://search.cpan.org/dist/Devel-SawAmpersand/lib/Devel/SawAmpersand.pm
It may happen under mod_perl since you usually end up loading quite a few modules into the same interpreters, including those that you aren't using for this particular code in question.
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