Disable fastmath with OpenCL on Intel devices

[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 ecd06e671e8c4296836a168b57254cd83795d6e5..1698fcedb260d307b15f8c9c182f17e920165895 100644 (file)
--- a/docs/user-guide/environment-variables.rst
+++ b/docs/user-guide/environment-variables.rst
@@ -22,9 +22,6 @@ you should consult your local documentation for details.
 
 Output Control
 --------------
-``GMX_CONSTRAINTVIR``
-        Print constraint virial and force virial energy terms.
-
 ``GMX_DUMP_NL``
         Neighbour list dump level; default 0.
 
@@ -426,6 +423,7 @@ compilation of OpenCL kernels, but they are also used in device selection.
 
 ``GMX_OCL_DISABLE_FASTMATH``
         Prevents the use of ``-cl-fast-relaxed-math`` compiler option.
+        Not: fast math is always disabled on Intel devices due to instability.
 
 ``GMX_OCL_DUMP_LOG``
         If defined, the OpenCL build log is always written to the
@@ -445,8 +443,8 @@ compilation of OpenCL kernels, but they are also used in device selection.
         ``GMX_OCL_NOGENCACHE``).
 
             - NVIDIA GPUs: PTX code is saved in the current directory
-             with the name ``device_name.ptx``
-           - AMD GPUs: ``.IL/.ISA`` files will be created for each OpenCL
+              with the name ``device_name.ptx``
+            - AMD GPUs: ``.IL/.ISA`` files will be created for each OpenCL
               kernel built.  For details about where these files are
               created check AMD documentation for ``-save-temps`` compiler
               option.