Add env.var. to disable update groups

[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 61ef25443e8b879794e6555ccdc8b4ff085201ce..a03d2958ad0a1ed69a59a9809c40b09ca0fc5778 100644 (file)
--- a/docs/user-guide/environment-variables.rst
+++ b/docs/user-guide/environment-variables.rst
@@ -316,6 +316,10 @@ Performance and Run Control
         turns off solvent optimizations; automatic if ``GMX_NB_GENERIC``
         is enabled.
 
+``GMX_NO_UPDATEGROUPS``
+        turns off update groups. May allow for a decomposition of more
+        domains for small systems at the cost of communication during update.
+
 ``GMX_NSCELL_NCG``
         the ideal number of charge groups per neighbor searching grid cell is hard-coded
         to a value of 10. Setting this environment variable to any other integer value overrides this hard-coded