Remove the CPU hardware context from the general list of test hardware contexts

[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 3878c4f298f3bed13517d9893a9ddb1ef3fc6a3a..9868a443a21e4d850ce6d0cf4577e93a3ba46c27 100644 (file)
--- a/docs/user-guide/environment-variables.rst
+++ b/docs/user-guide/environment-variables.rst
@@ -125,6 +125,12 @@ Debugging
         arrive first. Setting this variable switches to the generic path with fixed waiting
         order.
 
+``GMX_TEST_REQUIRED_NUMBER_OF_DEVICES``
+        sets the number of GPUs required by the test suite. By default, the test suite would
+        fall-back to using CPU if GPUs could not be detected. Set it to a positive integer value
+        to ensure that at least this at least this number of usable GPUs are detected. Default:
+        0 (not testing GPU availability).
+
 There are a number of extra environment variables like these
 that are used in debugging - check the code!