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Re: Mathematica 7.0 slow on OS X

  • To: mathgroup at smc.vnet.net
  • Subject: [mg93834] Re: Mathematica 7.0 slow on OS X
  • From: Antti Penttilä@smc.vnet.net
  • Date: Wed, 26 Nov 2008 07:23:04 -0500 (EST)
  • Organization: University of Helsinki
  • References: <ggj7j1$j8a$1@smc.vnet.net>

Bill Rowe wrote:
> On 11/25/08 at 7:18 AM, maderri2 at gmail.com (magma) wrote:
> 
>> Does the Mathematica 7.0 own benchmarkreport take advantage of
>> parallel computing? There should be an improvement at least there.
>> Or not?
> 
> Yes. That is looking at the code in Benchmark.m, there are
> points where the code is set to use parallel processing when
> possible. But this is also true for the code in Version 6. At
> the momement, I don't have a setup that allows me to see what
> effect this has.

With version 6 the parallel computing happened inside some numerical 
matrix library functions (provided by Intel). In version 7 the parallel 
computing can, in addition to that, use several Mathematica kernels in a 
totally new way.

With Mathematica benchmarking in my platform, however, the use of 
parallel subkernels with Math 7.0 seems to be very bad idea:

Needs[ "Benchmarking`"]
Kernels[]
  {}
(* Only one kernel *)
Benchmark[]
  ..."System" -> "Microsoft Windows (64-bit)",
  "BenchmarkName" -> "MathematicaMark7", "FullVersionNumber" -> "7.0.0",
  "Date" -> "November 26, 2008", "BenchmarkResult" -> 1.699,
  "TotalTime" -> 50.72...

LaunchKernels[]
  KernelObject[1, "local"], KernelObject[2, "local"]}
(* two parallel subkernels *)
Benchmark[]
  ...{"MachineName" -> "2-node homogeneous cluster",
  "System" -> "Windows-x86-64", "BenchmarkName" -> "MathematicaMark7",
  "FullVersionNumber" -> "7.0.0", "Date" -> "November 26, 2008",
  "BenchmarkResult" -> 1.97, "TotalTime" -> 262.494}

So, TotalTime went from 51 secs to 262 secs. Not very nice example of 
parallel advantages.

Antti


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