Strategy for Measuring L1/L2 Cache Size

[S0me1X]

I'm just curious how to measure the size of L1 and L2 cache with simple benchmarks (something that I can do in C would be best).

 

[CTho9305]

A simple, crude way to do it:
int i, j;
void *foo;
while(1)
{
foo = malloc(1024*i);
for (k=0; k<10; k++)
{
for (j=0; j<i*1024; j++)
{
foo[j] = 0;
}
}
}

Add some timing code, and when you notice the first major performance drop, you passed the L1 size, and at the second major drop, you passed the L2 size. You could also just use linpack.