I am using a -app file to run a serial application on N number of compute nodes and each compute node has 24 cores available. If I only want to use one core to execute the serial app I get a "not enough slots available" error when running OMPI. How do you define the slots parameter to inform OMPI that a total of 24 cores are available per node when using a app file. I need to contain all parameters in the -app file since any additional options passed on the mpirun command line are ignored.
io/jobs> mpirun -V mpirun (Open MPI) 1.10.2 io/jobs> mpirun --app cmd.file -------------------------------------------------------------------------- There are not enough slots available in the system to satisfy the 2 slots that were requested by the application: uptime Either request fewer slots for your application, or make more slots available for use. -------------------------------------------------------------------------- io/jobs> cat cmd.file --host hosta -np 1 convertslice input1 output1 --host hosta -np 1 convertslice input2 output2 --host hostb -np 1 convertslice input3 output3 --host hostb -np 1 convertslice input4 output4 Following is the lscpu output from one of the compute nodes showing 24 cores and 24 HTs available. io/jobs> lscpu Architecture: x86_64 CPU op-mode(s): 32-bit, 64-bit Byte Order: Little Endian CPU(s): 48 On-line CPU(s) list: 0-47 Thread(s) per core: 2 Core(s) per socket: 12 Socket(s): 2 NUMA node(s): 2 Vendor ID: GenuineIntel CPU family: 6 Model: 63 Stepping: 2 CPU MHz: 2500.092 BogoMIPS: 4999.93 Virtualization: VT-x L1d cache: 32K L1i cache: 32K L2 cache: 256K L3 cache: 30720K NUMA node0 CPU(s): 0-11,24-35 NUMA node1 CPU(s): 12-23,36-47 Any guidance would be greatly appreciated. Thanks, Scott
