Hi,
I recently tried the APS tool to capture the message details (size and amount) for the WRF application on the intel 8280 (opa)
Here is the data -
nodes,Message_size(B),Volume(MB),Volume(%),Transfers,Time(sec),Time(%)
1,0,0,0,58099903,3988.14,97.05
2,0,0,0,219491539,7554.45,96.19
4,0,0,0,850730419,15073.44,96.02
It seems that significant amount of time is spent in the transfer of these 0 byte messages and with more number of nodes, the amount of messages increases. Could you please help me in understanding the significance of these 0 bytes messages. How are they related to MPI communication protocol?
TCE Open Date:
Tuesday, January 14, 2020 - 23:43