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LinkTest is a communication API benchmarking tool that tests all possible point-to-point connections between an even-numbered set of hosts and is designed to work on very large numbers of hosts (tested using 1 800 000 MPI tasks on JUQUEEN, Blue Gene/Q). It supports the benchmarking of MPI, TCP, UCP, IB Verbs, PSM2, and NVLink bridges via CUDA. Output of the program is a full timing communication matrix of the message-transmission times for all pairs of hosts written parallelly to SION file. A standard out log that summarizes the results is also provided. Tools are provided to read the generated SION file into Python and to make 1-A4-page reports out of the data.
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LinkTest is a communication API benchmarking tool that tests all possible point-to-point connections between an even-numbered set of hosts and is designed to work on very large numbers of hosts (tested using 1 800 000 MPI tasks on JUQUEEN, Blue Gene/Q). It supports the benchmarking of MPI, TCP, UCP, IB Verbs, PSM2, Portals, and NVLink bridges via CUDA. Output of the program is a full timing communication matrix of the message-transmission times for all pairs of hosts written parallelly to SION file. A standard out log that summarizes the results is also provided. Tools are provided to read the generated SION file into Python and to make 1-A4-page reports out of the data.
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LinkTest benchmarks communication APIs for n hosts by running n-1 steps. In each step every host performs a ping-pong test with another host. The order in which these connections are tested is by default fixed, but can be randomized.
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