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Re: Benchmark performance Under AIX

  • To: mathgroup at smc.vnet.net
  • Subject: [mg96507] Re: Benchmark performance Under AIX
  • From: Jens-Peer Kuska <kuska at informatik.uni-leipzig.de>
  • Date: Sun, 15 Feb 2009 03:20:17 -0500 (EST)
  • References: <gn5ub5$gr8$1@smc.vnet.net>

Hi,

m2 = RandomArray[Real, {}, {20}]

gives

RandomArray[Real, {}, {20}]

Do you mean RandomReal[{}, {20}] ??

Regards
   Jens



Coleman, Mark wrote:
> Greetings,
> 
> I've been doing some benchmark testing of a new IBM Server running AIX
> that we use for Mathematica. In particular I am using the
> MathematicaMark6 tests that come with Mathematica v6.03. I've gotten
> a puzzling result and I was wondering if anyone else on MathGroup has
> seem a similar issue.
> 
> Briefly, we have Grid-Mathematica installed on an 6-CPU p500 series
> IBM server (the machine uses PowerPC Power6 CPUs at 4.2 Ghz each) with
> 32Gb of Ram, running ver 5.3 of 64bit AIX (IBM's Unix). I've been
> comparing the performance of this machine versus my standard 2Ghz
> Laptop running Windows 2000. (Note: I am not making use of any grid
> capabilities on the server)
> 
> Given the configurations of each machine, I would expect the server to
> be as much as 2x as fast as my laptop, given the difference in CPU
> speeds if nothing else. But this is not the case. The server results in
> a MathematicaMark6 score of 1.37 versus 1.67 for my laptop. I've traced
> the difference to Test #5 (Elementary Functions). The benchmark code for
> this test is:
> 
> Test 5:Elementary Functions
> 
> Module[{m1,m2},Timing[SeedRandom[1];m1=RandomArray[Real,{},{2000000}];
>   m2=RandomArray[Real,{},{2000000}];
>   Do[E^m1;Sin[m1];ArcTan[m1,m2],{30}]]]
> 
> 
> This code takes 6.06 seconds on my laptop and 26.8 seconds on the
> server!
> 
> I'm wondering if there is a known issue on AIX (or UNIX systems more
> generally) that might account for this?
> 
> Thanks,
> 
> Mark


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