From dc411017bb919231d74d511f51d5b0a5ed86ed9c Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Simon=20B=C3=BCrger?= <simon.buerger@rwth-aachen.de>
Date: Fri, 9 Jun 2023 18:20:50 +0100
Subject: [PATCH] Update 'Quda/Readme.md'

---
 Quda/Readme.md | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/Quda/Readme.md b/Quda/Readme.md
index 5c7520e..a162304 100644
--- a/Quda/Readme.md
+++ b/Quda/Readme.md
@@ -22,4 +22,9 @@ mpirun -np <ranks> <env_dir>/prefix/qudabench/Benchmark_Quda
 ```
 where `<ranks>` is the total number of GPU's to use. On Tursa this is 4 times the number of nodes.
 
-Note: on Tursa, the `wrapper.sh` script that is typically used with Grid is not necessary.
\ No newline at end of file
+Note:
+- on Tursa, the `wrapper.sh` script that is typically used with Grid is not necessary.
+- due to Qudas automatic tuning, the benchmark might take significantly longer to run than `Benchmark_Grid` (even though it does fewer things).
+  - setting `QUDA_ENABLE_TUNING=0` disables all tuning (degrades performance severely). By default, it is turned on.
+  - setting `QUDA_RESOURCE_PATH=<some folder>` enables Quda to save and reuse optimal tuning parameters, making repeated runs much faster
+  
\ No newline at end of file