My laptop takes at least 1 minute to boot up and let me login and another minute before I can do any useful work!!  Let’s find out how much data it can move around in that time!  Write a program to measure the effective memory bandwidth in each processor for different levels of the memory hierarchy
L1 cache
L2 cache
Main memory
Disc
Report results as Mbytes/second or latency in cycles (or both!)
How much data could be moved around in the boot up process?

这是哥们的最后一个作业了，哪位高手帮忙一下啊。

用c语言写，可是哥们一点idea都没有啊

老师给了段code，可是我不是很明白。

#include <time.h>
…
long t1, n; int x, *a, sum;
double dt;
a = malloc( finish*sizeof(int) );
sum = 0;
for(n=start;n+=step;n<=finish) {
  t1 = clock();
   for(k=0;k<n;k++) {
    sum += a[k];   }
  dt = ((double)(clock() – t1))/CLOCKS_PER_SEC;
  printf(“%d %f %f\n”, n, dt, dt/n);
  }
printf(“sum = %d\n”, sum);
}

网上有许多测试结果，可是没有供测试的code

哪位高手回答一下啊

谁会啊？