Recently, when I try to run something locally with OpenMPI with more than two ranks (I have a dual-core machine), I get the friendly message
-------------------------------------------------------------------------- There are not enough slots available in the system to satisfy the 3 slots that were requested by the application: ./kmer_generic_hash Either request fewer slots for your application, or make more slots available for use. -------------------------------------------------------------------------- Why is oversubscription now disabled by default when running without a hostfile? And how can I turn this off? I'm using default OpenMPI 3.0.0 on Arch Linux. Cheers, Ben
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