Support simple math on reserved keyword expressions

[fio.git] / HOWTO

diff --git a/HOWTO b/HOWTO
index cdd6473b28f3574f7a8eca445715cb3d7156b93e..9b3a6848e11c1a43867cd5da6a666ecff12df444 100644 (file)
--- a/HOWTO
+++ b/HOWTO
@@ -203,7 +203,13 @@ $ncpus             Number of online available CPUs
 
 These can be used on the command line or in the job file, and will be
 automatically substituted with the current system values when the job
-is run.
+is run. Simple math is also supported on these keywords, so you can
+perform actions like:
+
+size=8*$mb_memory
+
+and get that properly expanded to 8 times the size of memory in the
+machine.
 
 
 5.0 Detailed list of parameters