From: "Ara.T.Howard" <Ara.T.Howard@...>
Date: 2005-06-01T12:02:40+09:00
Subject: Re: Interesting discovery...

On Wed, 1 Jun 2005, Austin Ziegler wrote:

> I had a user report a slowdown in PDF::Writer. I'm pretty certain I
> know where the problem is, but I found something very interesting.
> About 3% of the profiled performance of the manual generation (with
> Shugo Maeda's new profiler) -- and near 20,000,000 (yes twenty
> MILLION) calls -- are calls to Kernel.respond_to?.
>
> A little digging later, and it looks like 98% of these calls -- or
> more -- are in Marshal.dump. That's ... amazing.

wow.  can you confirm with somthing like


   def Kernel::respond_to?(*a, &b)
     #
     # keep yer own count somehow...
     #
     __aliased_respond_to?(*a, &b)
   end

   def Marshal::dump(*a, &b)
     #
     # keep yer own count somehow...
     #
     __aliased_dump(*a, &b)
   end

and see how they scale (linearly/exponentially/etc)?  that's so crazy it seems
like more investigation might be needed...

cheers.

-a
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