Hello,
I am trying to use IndirectMemoryPrefetcher() in my research project. I wrote a
simple Proof of Concept(PoC) code to see if IMP is working or not. I tried
debugging the performance with the debug flag ‘HWPrefetch’ to see if I am
getting a prefetch hit/request. In Proof of Concept when I am trying to train
the Indirect Memory Prefetcher, I am not able to see any Prefetch hits at all.
I’m expecting the IMP will get activated though:
printf("- IMP training Start\\n");
for (*int* i = 0; i < trainSize; i++)
tmp = dataArray\[indices\[i\]\];
printf("- IMP training End\\n");
I suspect that Indirect Prefetcher Memory is not getting activated because
while using the same PoC with StridePrefetcher() the indices array is getting
prefetched in between the 2 print statements. For a successful IMP prefetching
I’m expecting a Cache Hit on indexes beyond ‘trainSize‘ in my dataArray.
T1 = __rdtscp(&trash);
tmp = dataArray\[trainSize + 64\];
T2 = __rdtscp(&trash);
I’m using caches.py and two_level.py from the configs/learning_gem5/part1/ and
I’ve added system.cpu = DerivO3CPU(branchPred=LTAGE()) to two_level.py and
prefetcher details to caches.py as seen in below screenshot.
IndirectMemoryPrefetcher() is used in L2Cache in a similar fashion.
It would be a great help if anyone would guide us with the instructions on
using IMPs.
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