I am getting different cache stats for L1 and L2 after evaluating the same executable via nvprof and nsight compute.

The machine configurations are:

GPU : P40

CUDA version : 10.1

```
#include <stdio.h>
#include "cuda_profiler_api.h"
__global__ void initialization(int n, float a, float *x, float *y)
{
int i = blockIdx.x * blockDim.x + threadIdx.x;
if (i<n/2) {
x[i] = i;
y[i] = 2*i;
}
}
__global__
void saxpy(int n, float a, float *x, float *y)
{
int i = blockIdx.x*blockDim.x + threadIdx.x;
if (i < n) y[i] = a*x[i] + y[i];
int sum = 0;
//if (i < n) sum = sum + y[i];
//if (i == n) printf("%d", sum);
}
int main(void)
{
int N = 1<<20;
float *x, *y, *d_x, *d_y;
cudaHostAlloc((void **)&x, N*sizeof(float), cudaHostAllocMapped );
cudaHostAlloc((void **)&y, N*sizeof(float), cudaHostAllocMapped );
cudaHostGetDevicePointer((void **)&d_x, x, 0);
cudaHostGetDevicePointer((void **)&d_y, y, 0);
for (int i = 0; i < N; i++) {
x[i] = 1.0f;
y[i] = 2.0f;
}
cudaDeviceSynchronize();
// Perform SAXPY on 1M elements
//initialization<<<(N+255)/256, 256>>>(N, 2.0f, d_x, d_y);
cudaProfilerStart();
saxpy<<<(N+255)/256, 256>>>(N, 2.0f, d_x, d_y);
cudaProfilerStop();
cudaDeviceSynchronize();
float maxError = 0.0f;
for (int i = 0; i < N; i++)
maxError = max(maxError, abs(y[i]-4.0f));
printf("Max error: %f\n", maxError);
cudaFree(d_x);
cudaFree(d_y);
cudaFreeHost(x);
cudaFreeHost(y);
}
```

cuda compilation : nvcc -Xptxas -O0 -Xptxas -dlcm=cg -Xptxas -dscm=cg -o saxpy_orig_cg_cg saxpy.cu

nvvp results :

Unified cache hit rate : 50%

L2 cache hit rate : 33%

nsight compute results :

Unified cache hit rate : 0.00%

L2 cache hit rate : 42.23&

It would be really great if someone could help me with this.

Thanks in advance.