Hi,
Me again ;) I have an example (N-body) written to execute in parallel. It works just fine, scales good on more cores. However, when I try to run it on more than one machine, more exactly on 4 nodes, I can see that X10 does not properly distributes the load to the nodes. I have nodes with 2 Intel processors, 6 cores each, that makes 12 cores per node, 48 cores per 4 nodes: export X10_HOSTLIST=node001,node002,node003,node004 export X10_NPLACES=48 I did compile for the sockets RT Implementation: # x10c++ -x10rt sockets -o nbody.parallel.sockets nbody.parallel.x10 When I execute the program, I can see that processes are spawn through the 4 nodes, however the load is not distributed evenly. On some nodes there are more than 12 processes running, on some less than 12. This is obviously not good as some nodes are overloaded (and as such processing is not optimal) and some are under loaded (that's not one would wish for). See the print screen from my monitoring software: (sorry, the picture was embedded wich is obviusly not supported by the mailing list, I've put it into attachement now) The usage for X10Laucher says: X10Launcher [-np NUM_OF_PLACES] [-hostlist HOST1,HOST2,ETC] [-hostfile FILENAME] COMMAND_TO_LAUNCH [ARG1 ARG2 ...] . so there is no parameter to set "processes per node" . I would expect something similiar as is the "-perhost" parameter in the MPI world. Is there any way to achieve this with the X10 sockets RT Implementation? Thanks for help! Kind regards, Marko Kobal
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