HP-MPI User's Guide (11th Edition)

Understanding HP-MPI
MPI options
Chapter 3152
By default, HP-MPI will search the unique full membership partition
key from the port partition key table used. If no such pkey is found, an
error is issued. If multiple pkeys are found, all such pkeys are printed
and an error message is issued.
If the environment variable MPI_IB_PKEY has been set to a value, either
in hex or decimal, the value is treated as the pkey, and the pkey table is
searched for the same pkey. If the pkey is not found, an error message is
issued.
When a rank selects a pkey to use, a check is made to make sure all
ranks are using the same pkey. If ranks are not using the same pkey, and
error message is issued.
MPI_IBV_QPPARAMS MPI_IBV_QPPARAMS=a,b,c,d,e Specifies QP
settings for IBV where:
a Time-out value for IBV retry if no response from target.
Minimum is 1. Maximum is 31. Default is 18.
b The retry count after time-out before error is issued.
Minimum is 0. Maximum is 7. Default is 7.
c The minimum Receiver Not Ready (RNR) NAK timer.
After this time, an RNR NAK is sent back to the
sender. Values: 1(0.01ms) - 31(491.52ms); 0(655.36ms).
The default is 24(40.96ms).
d RNR retry count before error is issued. Minimum is 0.
Maximum is 7. Default is 7 (infinite).
e The max inline data size. Default is 128 bytes.
MPI_VAPI_QPPARAMS MPI_VAPI_QPPARAMS=a,b,c,d specifies time-out
setting for VAPI where:
a Time out value for VAPI retry if no response from
target. Minimum is 1. Maximum is 31. Default is 18.
b The retry count after time-out before error is issued.
Minimum is 0. Maximum is 7. Default is 7.
c The minimum Receiver Not Ready (RNR) NAK timer.
After this time, an RNR NAK is set back to the sender.
Values: 1(0.01ms) - 31(491.52ms); 0(655.36ms). The
default is 24(40.96ms).