Hi all, I have a question related to Open MPI btl_tcp module. How to slow down OMPI in terms of network utilization ? My OpenMPI based application (lets call it APP1) is sharing hardware components with other software (lets call it APP2) which is very sensitive on network saturation. The APP2 suffers from lost “KEEP_ALIVE_RESPONSE” like tcp packages. Things are more complicated because of below described architecture constraints or other reasons:

    1. Ifconfig says us that on every node we have 3 NIC aliases (3 different IP and names with pattern such as: xxx0, xxx0:0, xxx0:1) in conjunction with bond configuration (all have the same HWaddr)

Any tips are very appreciated

Best Regards, Sylvester