> $ ./task -e LLC_MISSES,LLC_REFERENCES ./mcol
> Allocating 16 MiB for 1024x1024 matrix
> 1677.72MiB/s
>
> 2,126,459 LLC_MISSES (4,739,259,550 : 4,739,259,550)
> 131,373,392 LLC_REFERENCES (4,739,259,550 : 4,739,259,550)
what compiler options did you use when compiling?
on my core2 machine when compiled with "-O2 -Wall" I get
Allocating 16 MiB for 1024x1024 matrix
infMiB/s
16,314 LLC_MISSES (0.00% scaling, ena=32,442,281, run=32,442,281)
60,686 LLC_REFERENCES (0.00% scaling, ena=32,442,281,
run=32,442,281)
This is because your code never uses the matrix values, so the compiler is
free to optimize them out as a nop. If you're not compiling with
optimizations enabled then you're likely to see inefficient memory access
patterns.
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