Benchmark performance Under AIX

*To*: mathgroup at smc.vnet.net*Subject*: [mg96478] Benchmark performance Under AIX*From*: "Coleman, Mark" <Mark.Coleman at LibertyMutual.com>*Date*: Sat, 14 Feb 2009 03:11:16 -0500 (EST)

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