Changes between Version 15 and Version 16 of Public/ParaStationMPI

Timestamp:

Apr 6, 2020, 3:20:55 PM (4 years ago)

Author:

Carsten Clauß

Comment:

—

Public/ParaStationMPI

@@ -30 +30 @@
 
 === Feature Usage ===
-For using this feature, the following environment variables must be set and/or considered:
-{{{
-- PSP_MSA_AWARENESS=1      # NOT enabled by default
-- PSP_MSA_AWARE_COLLOPS=1  # Enabled by default if PSP_MSA_AWARENESS=1 is set
-- PSP_MSA_MODULE_ID=xyz    # Pass the respective module ID (Integer) explicitly to the processes
+For using this feature, the following environment variables must be set:
+{{{
+- PSP_MSA_AWARENESS=1      # Generally activate the consideration of modular topologies (NOT enabled by default)
+- PSP_MSA_MODULE_ID=xyz    # Pass the respective Module ID (Integer) explicitly to the processes (NOT set automatically)
 }}}
 
@@ -58 +57 @@
 > srun ./script0 : ./script1
 }}}
+
+In addition, the following variable can be used to influence the behavior of the MSA awareness for the collective operations:
+{{{
+- PSP_MSA_AWARE_COLLOPS=0|1|2
+   0: Disable MSA awareness for collective MPI operations
+   1: Enable MSA awareness for collective MPI operations (default)
+   2: Apply MSA awareness recursively in multi-level topologies
+}}}
+In the recursive application of MSA awareness (`PSP_MSA_AWARE_COLLOPS=2`), a distinction is first made between inter- and intra-module communication and then, in a second step, likewise between inter- and intra-node communication within the modules.
+
 
 == CUDA Support by !ParaStation MPI ==