From: Mike Bethany <mikbe.tk@...>
Date: 2011-07-28T18:40:36+09:00
Subject: Re: Fiber performance in 1.9.2-p290 vs -p180

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You should note that it's not running the fibers that's taking so much time;
it's the creation of the fibers that's taking most of the time.
https://gist.github.com/1111286

ruby 1.9.2p180 (2011-02-18 revision 30909) [x86_64-darwin10.7.0]

10000, 1:
Rehearsal ------------------------------------
 Creation: 7.04735
Execution: 0.739264
  7.670000   0.080000   7.750000 (  7.786814)
 Creation: 2.846162
Execution: 0.337496
  3.110000   0.080000   3.190000 (  3.183820)
 Creation: 2.574672
Execution: 0.176939
  2.680000   0.070000   2.750000 (  2.751769)
-------------------------- total: 13.690000sec

       user     system      total        real
 Creation: 1.767601
Execution: 0.217488
  1.910000   0.080000   1.990000 (  1.985250)
 Creation: 1.418652
Execution: 0.321165
  1.690000   0.050000   1.740000 (  1.740013)
 Creation: 1.733864
Execution: 0.372116
  2.040000   0.060000   2.100000 (  2.106124)


On Wed, Jul 27, 2011 at 9:11 PM, Lunatic Leo <lleoem@gmail.com> wrote:

> I wrote a simple Fiber benchmark (based on an earlier one I found).
> I ran it one MRI ruby 1.9.2-p180 and -p290. The performance
> difference was dramatic. p290 executed the benchmark 25-50
> times faster. I didn't plot the scaling factor, cuz I don't know an easy
> graph plotting tool.
>
> Does anyone know why there is this dramatic Fiber preformance
> difference?
>
>
> -LLeo
>
> P.S.
> The code is attached and on github.com as gist:1108752
> https://gist.github.com/1108752
>
> I ran (on a 2011 MBP w/8gb ram)
> % rvm use 1.9.2-p180
> % ./fiber_ring.rb 1000 1
> 1000, 1,   0.010000   0.000000   0.010000 (  0.012526)
> % ./fiber_ring.rb 10_000 1
> 10000, 1,   3.490000   0.050000   3.540000 (  3.553194)
> % ./fiber_ring.rb 100_000 1
> 100000, 1, 792.170000   1.370000 793.540000 (792.917801)
>
> and
> % rvm use ruby-1.9.2-p290
> % ./fiber_ring.rb 1000 1
> 1000, 1,   0.000000   0.010000   0.010000 (  0.012345)
> % ./fiber_ring.rb 10_000 1
> 10000, 1,   0.210000   0.040000   0.250000 (  0.264341)
> % ./fiber_ring.rb 100_000 1
> 100000, 1,  13.910000   0.640000  14.550000 ( 14.664316)
>
> Attachments:
> http://www.ruby-forum.com/attachment/6456/fiber_ring.rb
>
>
> --
> Posted via http://www.ruby-forum.com/.
>
>

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