Mruby fastr than ruby 2.0 and jruby?

ruby-talk
1

hello,
trying this stupid code,

···

=========================
def a(p,j)
   i=0
   while i<1000
      p+=j*(j-1)*(j-2)*(j-3)*(j-4)*(j-5)*(j-6)*(j-7)*(j-8)*(j-9)
      i+=1
   end
   p
end
def b(b)
  starttime=Time.now if b
  puts("start") if b
  p=0
  j=10
  while j<10000
   p=a(p,j)
   j+=1
  end
  endtime=Time.now if b
  puts("end : p="+p.to_s+ " "+ (endtime-starttime).to_f.to_s + " secs")
if b
end
b(false)
b(true)

===============================
I get this strange result :

jruby j.rb

start
end : p=9041028926052438935146265250228470208000000000 14.0 secs

ruby j.rb

start
end : p=9041028926052438935146265250228470208000000000 26.663525 secs

mruby j.rb

start
end : p=9.04102892605544e+45 2.34413399999999 secs

jruby -v && ruby -v && mruby -v

jruby 1.6.0 (ruby 1.8.7 patchlevel 330) (2011-03-15 f3b6154) (Java
HotSpot(TM) Client VM 1.6.0_31) [Windows 7-x86-java]
ruby 2.0.0p0 (2013-02-24) [i386-mingw32]
mruby 1.0.0 (2014-01-10)

So mruby is it realy the faster ruby vm ?

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2

Hi,

So mruby is it realy the faster ruby vm ?

In general, no. This case is special, since mruby does not have
Bignums and uses faster (and inaccurate) Floats instead.

              matz.

···

In message "Re: mruby fastr than ruby 2.0 and jruby ?" on Tue, 18 Feb 2014 18:23:42 +0100, Regis d'Aubarede <lists@ruby-forum.com> writes:

hello,
trying this stupid code,

def a(p,j)
  i=0
  while i<1000
     p+=j*(j-1)*(j-2)*(j-3)*(j-4)*(j-5)*(j-6)*(j-7)*(j-8)*(j-9)
     i+=1
  end
  p
end
def b(b)
starttime=Time.now if b
puts("start") if b
p=0
j=10
while j<10000
  p=a(p,j)
  j+=1
end
endtime=Time.now if b
puts("end : p="+p.to_s+ " "+ (endtime-starttime).to_f.to_s + " secs")
if b
end
b(false)
b(true)

===============================
I get this strange result :

jruby j.rb

start
end : p=9041028926052438935146265250228470208000000000 14.0 secs

ruby j.rb

start
end : p=9041028926052438935146265250228470208000000000 26.663525 secs

mruby j.rb

start
end : p=9.04102892605544e+45 2.34413399999999 secs

jruby -v && ruby -v && mruby -v

jruby 1.6.0 (ruby 1.8.7 patchlevel 330) (2011-03-15 f3b6154) (Java
HotSpot(TM) Client VM 1.6.0_31) [Windows 7-x86-java]
ruby 2.0.0p0 (2013-02-24) [i386-mingw32]
mruby 1.0.0 (2014-01-10)

So mruby is it realy the faster ruby vm ?

--
Posted via http://www.ruby-forum.com/\.

3

So mruby is it realy the faster ruby vm ?

In general, no. This case is special, since mruby does not have
Bignums and uses faster (and inaccurate) Floats instead.

Thank you for your response.

So I replace
p+=j*(j-1)*(j-2)*(j-3)*(j-4)*(j-5)*(j-6)*(j-7)*(j-8)*(j-9)
by
p+=(1.0*j*(j-1))/(1.0*j*j+1)

and
  p+=a(p,j)
by
  p=a(1,j)

Then I get :

mruby j.rb && ruby j.rb && jruby j.rb

start
end : p=1000.89997999798 1.52808799999999 secs
start
end : p=1000.8999799979861 5.132293 secs
start
end : p=1000.89997999799 3.494 secs

Perhaps windows version give some strange degradation...

···

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4

another test with a sudoku resolver :

mrbc sudoku.rb && ruby sudoku.rb && jruby sudoku.rb && mruby -b sudoku.mrb

duration 6.37931 secs, 0.637931 ms by resolution
duration 13.161 secs, 1.3161 ms by resolution
duration 27.4534860 secs, 2.74534860 ms by resolution

code : https://gist.github.com/raubarede/9120207

···

====
adaptations for mruby:
* int/int ==> float in mruby , so convert (a/b) by (a/b).floor
* here docs / DATA not implemented in mruby

original sudokutest is modified for doing backtracking

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