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ParallelMap in FindMinimum getting slower

• To: mathgroup at smc.vnet.net
• Subject: [mg121959] ParallelMap in FindMinimum getting slower
• From: Rafael Reiter <mail at zonk.at>
• Date: Fri, 7 Oct 2011 04:48:18 -0400 (EDT)
• Delivered-to: l-mathgroup@mail-archive0.wolfram.com

Hi everyone,

I use ParallelMap with Mathematica on Linux to solve 100 eigenvalue
problems on 4 kernels. This operation ist repeated very often by
FindMinimum, and over the course of time the performance drops
significantly. Using top, you can see that the CPU used by the master
kernel increases, and the CPU used by the slave kernels decreases from
70 to appr. 20 percent. Has anyone else experienced this phenomenon?

Best wishes,
Rafael

• Follow-Ups:
  • Re: ParallelMap in FindMinimum getting slower
    • From: Oliver Ruebenkoenig <ruebenko@wolfram.com>