Command Parameters of Hyper MPI 2.4.3 and Later Versions

This section describes the command parameters of Hyper MPI 2.4.3 and later versions.

Hyper MPI 2.4.3 and later versions add new command parameters, based on those in Hyper MPI 1.3.* and later versions.

When using Hyper MPI command parameters to specify algorithms, you can refer to Algorithms for the meaning of specific parameter values.

**Table 1** Command parameters of Hyper MPI 2.4.3 and later versions
Parameter	Value	Description
-x UCG_PLANC_ALLTOALLV_ALGO_SELECT=	Type: string Range: y: Enable automatic algorithm switchover in Alltoallv small-packet scenarios. n: Disable automatic algorithm switchover in Alltoallv small-packet scenarios. Default value: n	(Optional) After this function is enabled, if the Alltoallv algorithm is not specified, the node-aware plummer algorithm with better performance is used for small packets of 256 bytes or less. After this function is disabled, the algorithm is not switched. Example: -x UCG_PLANC_ALLTOALLV_ALGO_SELECT=y

Parent topic: Command Parameters