Disable prefetching on BG/Q because it seems to hurt performance

Meinersbur · Oct 12, 2012 · 60b9127 · 60b9127
1 parent e806bf0
commit 60b9127
Showing 1 changed file with 3 additions and 1 deletion.
diff --git a/xlc_prefetch.h b/xlc_prefetch.h
@@ -26,7 +26,9 @@
 #ifndef _XLC_PREFETCH_H
 #define _XLC_PREFETCH_H
 
-#ifdef XLC
+/* disable prefetching on BGQ */
+
+#if (defined XLC && !defined BGQ)
 
 #define _prefetch_spinor(addr)			    \
   __dcbt(((char*)((unsigned long int)(addr))));	    \