I am running a simple stream benchmark that does a simple addition:
m5_reset_stats(0,0);
for(int i = 0 ; i <Size; i++)
c[i] =a[i]+b[i];
m5_dump_stats(0,0);
Each element of these arrays is a uint64_t. I turned off prefetchers and
only enabled one level of cache. When I run for size of 10K elements,
since 8 uint_64 elements can be fit onto a block, I expect to have at most
10K/8=1250 reads from main memory. However, if I use LRU RP at L1, I see
1792 reads at main memory. If the RP changes to RRRIP, then it would be
1340 reads.
I cannot figure out why LRU is doing poorly, while it should be way better.
In terms of numCycles, also LRU is slower than RRRIP?
Majid
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