add AMD scratchpad indexing option

Allow to change the indexing used to address the hash scratchpad memory.

- add option `strided_index` for each gpu

1 files changed, 7 insertions, 1 deletions

diff --git a/doc/tuning.md b/doc/tuning.md
index 474553b..25c5065 100644
--- a/doc/tuning.md
+++ b/doc/tuning.md
@@ -8,6 +8,7 @@
   * [Choose `intensity` and `worksize`](#choose-intensity-and-worksize)
   * [Add more GPUs](#add-more-gpus)
   * [Increase Memory Pool](#increase-memory-pool)
+  * [Scratchpad Indexing](#scratchpad-indexing)
 
 ## NVIDIA Backend
 
@@ -80,4 +81,9 @@ export GPU_MAX_ALLOC_PERCENT=99
 export GPU_SINGLE_ALLOC_PERCENT=99
 ```
 
-*Note:* Windows user must use `set` instead of `export` to define an environment variable.
\ No newline at end of file
+*Note:* Windows user must use `set` instead of `export` to define an environment variable.
+
+### Scratchpad Indexing
+
+The layout of the hash scratchpad memory can be changed for each GPU with the option `strided_index` in `amd.txt`.
+Try to change the value from the default `false` to `true`.