I'm running OpenMx on 4 different computers running Ubuntu 15.04 and the latest version of OpenMx and current versions of R. On one, when look at the output for htop, it seems clear that all 4 cores are being used by OpenMx. Yet on two of the others, htop seems to indicate that not all 4 cores are being used simultaneously and the same model takes 2 to 3 times longer to run. I've tried using the suggestion to tell OpenMx to use more threads - but this seems to have no effect and I never had to do this on the computer that seems to be using all 4 cores and runs the model much more quickly. I don't think its processing power is greater than the other computers. When I used to install OpenMx, it seemed that it asked you if you wanted parallel processing enabled. But lately it no longer asks.
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