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Sorry if I missed the correspondence between Perl6::Declare and Devel::Declare & Perl6::Signatures. If indeed there is any?

Perl6::Declare lets you declare subroutine/methods using Perl 6 signatures, which are lovely. I heard this turns out to actually be faster than Perl 5 calling conventions,

Devel::Declare talks about "declarator magic" and Perl6::Signature contains a Parse::RecDescent-based parser for signatures.".

If anything that uses P::RD turns out to be faster than my( $x, $y, $z ) = @_;, it will indeed be "magic". Oh! and I'll eat my hat! (I'll have to buy a hat to eat, but I'm sure I can find something tasty at a thrift shop:)


To clarify, what I meant by my request for less overhead, was a reduction in the internal (C-level) overhead associated with calling a perl subroutine, that results in this kind of comparison of similar subroutines coded in Perl and another bytecode compiled, interpreted language: Java.

Are Perl's function calls slow?

The archetypal test of function call performance is the Ackermann Function. Go here to see the list of other languages that out-perform Perl for function call performance. Many of those are fully pre-compiled languages. Many are not.

For comparison purposes, look at straight forward implementations in Perl, with the same in Java.

Perl:

P:\test\MJD>ack1 9 Ack(3,9): 4093 78.843 83.671 0 0

Java:

P:\test\MJD>timethis "c:javac ackermann.java && java ackermann 9" TimeThis : Command Line : c:javac ackermann.java && java ackermann 9 TimeThis : Start Time : Fri Sep 02 22:01:28 2005 Ack(3,9): 4093 TimeThis : Command Line : c:javac ackermann.java && java ackermann 9 TimeThis : Start Time : Fri Sep 02 22:01:28 2005 TimeThis : End Time : Fri Sep 02 22:01:29 2005 TimeThis : Elapsed Time : 00:00:01.031

I've included the compilation and runtime for Java to even the score a little. JIT was not enabled.

So 83.6 seconds for Perl, and 1.031 seconds for Java!

Conclusion: Perl's function calls are slow.


Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
"Science is about questioning the status quo. Questioning authority".
In the absence of evidence, opinion is indistinguishable from prejudice.

In reply to Re^7: what would you like to see in perl5.12? by BrowserUk
in thread what would you like to see in perl5.12? by ysth

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