Advanced topics

Multi-node execution

Using legate

cuPyNumeric programs can be run in parallel by using the --nodes option to the legate driver, followed by the number of nodes to be used. When running on 2+ nodes, a task launcher must be specified.

Legate currently supports using mpirun, srun, and jsrun as task launchers for multi-node execution via the --launcher command like arguments:

legate --launcher srun --nodes 2 script.py <script options>

Using a manual task manager

mpirun -np N legate script.py <script options>

It is also possible to use “standard python” in place of the legate driver.

Passing Legion and Realm arguments

It is also possible to pass options to the Legion and Realm runtime directly, by way of the LEGION_DEFAULT_ARGS and REALM_DEFAULT_ARGS environment variables, for example:

LEGION_DEFAULT_ARGS="-ll:cputsc" legate main.py