Extend task assignment code

[alexxy/gromacs.git] / docs / user-guide / environment-variables.rst

diff --git a/docs/user-guide/environment-variables.rst b/docs/user-guide/environment-variables.rst
index 217629c61c3e7fb3f0d7942aaeb4e85a7f295c78..4d6d780bf2175668d58df384850e3c153c3b79fc 100644 (file)
--- a/docs/user-guide/environment-variables.rst
+++ b/docs/user-guide/environment-variables.rst
@@ -209,9 +209,15 @@ Performance and Run Control
 
 ``GMX_GPU_ID``
         set in the same way as ``mdrun -gpu_id``, ``GMX_GPU_ID``
-        allows the user to specify different GPU id-s, which can be useful for selecting different
+        allows the user to specify different GPU IDs for different ranks, which can be useful for selecting different
         devices on different compute nodes in a cluster.  Cannot be used in conjunction with ``mdrun -gpu_id``.
 
+``GMX_GPUTASKS``
+        set in the same way as ``mdrun -gputasks``, ``GMX_GPUTASKS`` allows the mapping
+        of GPU tasks to GPU device IDs to be different on different ranks, if e.g. the MPI
+        runtime permits this variable to be different for different ranks. Cannot be used
+        in conjunction with ``mdrun -gputasks``. Has all the same requirements as ``mdrun -gputasks``.
+
 ``GMX_IGNORE_FSYNC_FAILURE_ENV``
         allow :ref:`gmx mdrun` to continue even if
         a file is missing.