max_locked_mem and min_unlocked_mem

You should not change these node attributes. They are described here so that you will be able to interpret their values when node attributes are displayed via the dump or show commands.

The max_locked_mem and min_unlocked_mem attributes limit the amount of shared memory available to be locked down for use by Sun MPI processes. Locking down shared memory guarantees maximum speed for Sun MPI processes by eliminating delays caused by swapping memory to disk. However, locking physical memory can have undesirable side effects because it prevents that memory from being used by other processes on the node.

Solaris provides two related tunable kernel parameters:

• tune_t_minasmem, which is similar to min_unlocked_mem

• pages_pp_maximum, which is similar to max_locked_mem.

The CRE parameters impose limits only on MPI programs, while the kernel parameters limit all processes. Also, the kernel parameter units are pages rather than Kbytes. Refer to your Solaris documentation for more information about tune_t_minasmem and pages_pp_maximum.