Linear algebra performance between 5.0 and 5.2

*To*: mathgroup at smc.vnet.net*Subject*: [mg61118] Linear algebra performance between 5.0 and 5.2*From*: Antti Penttilä@smc.vnet.net*Date*: Tue, 11 Oct 2005 03:20:09 -0400 (EDT)*Organization*: University of Helsinki*Sender*: owner-wri-mathgroup at wolfram.com

Hello all, I updated my Mathematica from 5.0 to 5.2 on a Windows XP, dual Athlon MP 1900+ machine. Then I wanted to see if there are any speed improvements e.g. in linear algebra. With 5.0 i had, for example n1 = 2000; c = Table[ Random[], {i, n1}, {j, n1}]; Timing[ Inverse[ c];] {8. Second,Null} and processor utilization was almost 100% when calculating. With 5.2 I have now n1 = 2000; c = Table[ Random[], {i, n1}, {j, n1}]; Timing[ Inverse[ c];] {25.64 Second,Null} with processor utilization only at 50%, which means that only one processor is calculating. What's the matter with this, how can I utilize both processors automatically? -- Antti Penttilä Antti.I.Penttila at helsinki.fi.removethis Researcher Observatory tel. +358 50 5240968 00014 University of Helsinki