More options on substreams
Created by: jychoi-hpc
This is a feature request on aggregation (substreams).
I am wondering if we can add an option to set stride on aggregation (say,
Currently, if I run N processes and set X as substreams, rank 0 up to N/X-1 will be aggregated. I like to have an option to aggregate every Y-th processes (i.e., rank 0, Y-1, 2*Y-1, etc).
This will be helpful on Summit (and with SSD). Especially, XGC re-orders ranks and currently it is impossible to set to write XGC restart data by using one aggregator per node.
Any comment or suggestion will be appreciated.