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Re: [PATCH] Re: change #9754: 5 x slowdown for perl -d

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Dave Mitchell
January 26, 2003 07:35
Re: [PATCH] Re: change #9754: 5 x slowdown for perl -d
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On Sun, Jan 26, 2003 at 05:02:28PM +0200, Jarkko Hietaniemi wrote:
> Based on my quick&dirty testing (the and the input file xaa 
> from the bug id #20218), on Tru64, with cc -O4, this claws us back almost
> to the 5.6.1 speeds (execution speed 5.6.1 = 100, maint branch after this
> patch = 117).  I'll do some further profiling to see where's the rest going.
> (Unfortunately it seems that reverting the second-most-slowing-down
> change #14920 that did cause a 40% drop (IIRC) back in between 5.7.2
> and 5.7.3 doesn't give us back much, if any, of the speed.)

Well, the main bug, now fixed, was that under -d and use integer,
DB::DB was being called for each and every statement. I guess that 
#14920, Ilya's "autoloaded DESTROY bugfix", was just making DB::DB
run a bit slower. Since we're no longer calling DB::DB at all, it's
probably irrelevant (to this issue, anyway).

Surely any remaining differences are just general 5.6 -> 5.8 slowdown,
which we're all familiar with?

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