Faster Multiplication Fixnum in Ruby?

Question

using ruby 1.9.2p290 (2011-07-09 version 32553) [x86_64-linux]

I did a lot of profiling, and it seems to me that Ruby Fixnum propagation is very slow.

After some profiling, I found out that this is (partially), because every call to Fixnum # * includes 6 calls to the core # kind_of .

I know that you can write C extensions, but these multiplications spread throughout the code. So, is there anyway to avoid this overhead inside Ruby?

thank

+5

user844942 Aug 22 '12 at 21:44

2 answers

Jörg W Mittag · Answer 1 · 2012-08-23T00:55:25+0000

I seriously doubt that these measurements are accurate for several reasons:

, Ruby , ruby-prof Ruby. Ruby. , Ruby- , Fixnum#* - Ruby. MRI, YARV, MRuby tinyrb C, Rubinius ++, MacRuby Objective-C, JRuby XRuby - Java, RubyGoLightly - Go, IronRuby Ruby.NET #, MagLev SmallRuby Smalltalk, - PASM. ruby-prof Ruby, C, ++, Objective-C, Java, #, Go, Smalltalk PASM. . Fixnum#*.
Fixnum#* . , self Fixnum, Fixnum#*, . , Fixnum , , kind_of? ( : , , , , , Fixnum ).
, kind_of? Ruby. Ruby, , , Ruby kind_of?
Fixnum#* Ruby kind_of?. , , Ruby .
- Rubinius: Fixnum::mul vm/builtin/fixnum.cpp l. 78-89
- YARV: fix_mul numeric.c l. 2596-2640
- JRuby: org.jruby.RubyFixnum.{op_mul, multiplyFixnum, multiplyOther} src/org/jruby/RubyFixnum.java l. 472-520 ( , , Java instanceof Ruby kind_of? .)

user844942 · Answer 2 · 2012-08-23T15:45:29+0000

... ... 6 # kind_of? ol '.

, , , .