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Re: Mathematica 7 is now available

  • To: mathgroup at smc.vnet.net
  • Subject: [mg94440] Re: Mathematica 7 is now available
  • From: Jean-Marc Gulliet <jeanmarc.gulliet at gmail.com>
  • Date: Sun, 14 Dec 2008 07:32:31 -0500 (EST)
  • Organization: The Open University, Milton Keynes, UK
  • References: <gg62p3$56g$1@smc.vnet.net> <gh8hkr$r1d$1@smc.vnet.net> <ghavsp$ock$1@smc.vnet.net> <200812081121.GAA15802@smc.vnet.net> <ghlmbp$jof$1@smc.vnet.net> <200812100949.EAA00307@smc.vnet.net> <ghqk4i$193$1@smc.vnet.net> <ghtjjj$red$1@smc.vnet.net>

Jon Harrop wrote:

<snip>

> I've managed to get rid of all the errors by calling DistributeDefinitions 
> with the symbol names of all functions *and* the local "scene" variable
> right before the ParallelMap. However, this still doesn't give any
> performance improvement (and it only spawns 4 kernels for my 8 cores).

John,

You seem to believe that Mathematica 7.0 uses as many core as available 
on a given machine (the marketing documentation is quite misleading to 
this respect).

However, the default license allows only up to 4 cores to be used (of 
course, one can upgrade one's license by paying an additional fee).

The number of cores can also be restricted by the user. Check the tab 
"Parallel" in the "Preferences" dialog box (goto menu "Edit" -> 
"Preferences" at the bottom) [1].

Regards,
- Jean-Marc

[1] _Configuring and Monitoring_,
http://reference.wolfram.com/mathematica/ParallelTools/tutorial/ConfiguringAndMonitoring.html



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