MPI_Sendrecv

In this measurement we use MPI_Sendrecv for sending and receiving at the sender and the receiver. This can be compared with the standard ping-pong test and with the following test of MPI_Sendrecv_replace.

• Pattern: Point-to-Point varied over message length.
• default values: 8 nodes, max. / act. time for suite disabled/0.39 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: 205.9 $\mu$s
• Bandwidth at msg. length 0 units: 0 units/s
• Latency at msg. length 4096 * 1024 units: 732556 $\mu$s
• Bandwidth at msg. length 4096 * 1024 units: 11182.8 * 1024 units/s