On 6/2/06, Canqun Yang <[EMAIL PROTECTED]> wrote:
This patch results a performance increase of 4% for SPECfp2000 and 13% for NAS benchmark suite on Itanium-2 system, respectively. More performance increase is hopeful by further tuning the parameters and improving the prefetch algorithm at tree level.
Bravo.
--- ia64.h (revision 114307) +++ ia64.h (working copy) @@ -1985,13 +1985,18 @@ ??? This number is bogus and needs to be replaced before the value is actually used in optimizations. */ -#define SIMULTANEOUS_PREFETCHES 6 +#define SIMULTANEOUS_PREFETCHES 18
Is the number still bogus as the comment suggests, or is there a rationale for 18? It looks quite high.
+/* A number that should roughly corresponding to the nunmber of instructions + executed before the prefetch is completed. */ + +#define PREFETCH_LATENCY 400
Likewise. Is 400 cycles the memory latency on itanium-2? Gr. Steven
