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Re: [perl #117239] Re: [perl #117259] Re: Bleadperlv5.17.9-200-g0e0ab62breaks MLEHMANN/JSON-XS-2.33.tar.gz

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March 26, 2013 12:36
Re: [perl #117239] Re: [perl #117259] Re: Bleadperlv5.17.9-200-g0e0ab62breaks MLEHMANN/JSON-XS-2.33.tar.gz
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On 26 March 2013 13:14, Marc Lehmann <> wrote:
> The very fact that your test is apparently slightly faster with a much
> slower function call should have been an enourmous wake-up call to you -
> at the very least, you could have added an abort() to atcually check if
> its actually being executed. But hey, it fooled Yves too.

If you are referring to the timing results that Merijn posted then I
dont know what you mean by "fooled" me. I looked at the numbers and
concluded that the variance was in the noise. Such a description is
exactly what you expect if the code is the same for both. I did not
closely look at Merijn's code, and made and make no comment on whether
it is a valid benchmark.

As for /your/ "benchmark", well, it doesn't seem to be very useful
either. "real    0m0.808s" is the output of the bash time function,
and does not constitute a benchmark in any way. I suggest you read

which could almost be tailor written for this exact case.

Try running under dumbbench for a while and see what it says. THAT
would be a real benchmark. What you posted is a discrete timing, and
on its own tells us almost nothing.

Lastly I would just like to say that comments like this:

"That probably doesn't mean much to p5pers who don't mind slowing down perl
by a factor of up to two because its fun to run your own mmu emulation in
the process emulation code, but it means a lot to JSON::XS."

are unhelpful and just plain rude. We care a lot about slowing down
perl, and if we do slow down perl we do only because we have good
reasons, like correctness or security.

You are clearly an intelligent person. Anyone reading your code knows
you are both an experienced C programmer and an intelligent guy.
However when you say snotty things like me being fooled, or that we
don't care about performance, you come across as an extremely
unpleasant person, which in turn makes people like me quite unwilling
to help you. The fact is I could mention a few things that would grind
an extra few percent out of JSON::XS, which you seem to care about,
but I probably won't because I am unwilling to help someone who is
repeatedly rude and insulting to me and my colleagues. You need to
think about that for a while. You are missing out on the support of
other clever people only because you cant keep a civil tongue in your
head. That is sad.


perl -Mre=debug -e "/just|another|perl|hacker/"

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