MPI Tracing Metrics

See Also

MPI tracing records information about calls to functions from the MPI library. MPI tracing information is converted into the following metrics:

Metric Definition
MPI Receives Number of receive operations in MPI functions that receive data
MPI Bytes Received Number of bytes received in MPI functions
MPI Sends Number of send operations in MPI functions that send data
MPI Bytes Sent Number of bytes sent in MPI functions
MPI Time Time spent in all calls to MPI functions
Other MPI Calls Number of calls to other MPI functions

The number of bytes recorded as received or sent is the buffer size given in the call, which might be larger than the actual number of bytes received or sent. In the global communication functions and collective communication functions, the number of bytes sent or received is the maximum number, assuming direct interprocessor communication and no optimization of the data transfer or re-transmission of the data.

Similarly, the number of send operations or receive operations might be larger than the actual number of operations performed.

The functions from the MPI library that are traced are listed in the following table, categorized as MPI send functions, MPI receive functions, MPI send and receive functions, and other MPI functions.

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Category Functions
MPI send functions MPI_Bsend, MPI_Isend, MPI_Rsend, MPI_Send, MPI_Ssend
MPI receive functions MPI_Irecv, MPI_Recv
MPI send and receive functions MPI_Allgather, MPI_Allgatherv, MPI_Allreduce, MPI_Alltoall, MPI_Alltoallv, MPI_Bcast, MPI_Gather, MPI_Gatherv, MPI_Reduce, MPI_Reduce_scatter, MPI_Scan, MPI_Scatter, MPI_Scatterv, MPI_Sendrecv, MPI_Sendrecv_replace
Other MPI functions MPI_Barrier, MPI_Wait, MPI_Waitall, MPI_Waitany, MPI_Waitsome, MPI_Win_fence, MPI_Win_lock
See also
Timing Metrics
Hardware Counter Metrics
Thread Synchronization Delay Metrics
Memory Allocation Metrics
Exclusive, Inclusive, and Attributed Metrics
Setting Data Presentation Preferences

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