MPI_Send-MPI_Recv

This is the ``standard''-ping-pong test. A message is send with MPI_Send from a node to another receiving with MPI_Recv. The receiving node replies also with MPI_Send. As result the bandwith of a node is given. That is incoming bandwith plus outgoing bandwith.

This measurement serves as a reference for all other ping-pong measurements.

• Pattern: Point-to-Point varied over message length.
• default values: 8 nodes, max. / act. time for suite disabled/0.03 min.
• Max. allowed standard error is 3.00 %.

	message length
X axis scale	logarithmic
Param. refinement	automatic x wide adaption
Argument range	1 - 4194304 units (s. below)
Argument stepwidth	1.414214

• Units: bytes in type: basetype 1 (MPI_INT), send-datatype 20: size 4 Bytes, extent 4 Bytes (user defined basetype 1 (MPI_INT)), receive-datatype 20: size 4 Bytes, extent 4 Bytes (user defined basetype 1 (MPI_INT))

• Latency at msg. length 0 units: 11.2 $\mu$s
• Bandwidth at msg. length 0 units: 0 units/s
• Latency at msg. length 4096 * 1024 units: 25328.3 $\mu$s
• Bandwidth at msg. length 4096 * 1024 units: 323433 * 1024 units/s