trying to find number of caches on a machine


 
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# 1  
Old 10-21-2006
trying to find number of caches on a machine

I am trying to find the number of caches on a machine programatically.

#include <stdio.h>
#include <malloc.h>

int main(void)
{
int *ptr,*ptr1,i,j;
j=0;
i=1;
printf("Changing allocation with brk()\n");
while(1)
{

for(j=0;j<i;j++)
{
ptr = (int *) malloc(i);
ptr[j] = j;
printf("VALUE %d is:: %lu\n",j,ptr[j]);
brk(ptr+i);
ptr1=(ptr+j);
printf(" VALUE of trace end is::%lu\n",ptr1);
i++;
}
}
return 0;
}

I was thinking of embedding time in such a way that I could track access to a particular growing memory size. The moment the access time varied, the cache level was changed. Am I thinking along the right lines, please guide me.
# 2  
Old 10-30-2006
Interesting idea but your code seems to be too complicated for me.
Try to alloc memory once (e.g. 10MB)
and perform timing of 'mangling' areas of growing size:
256kB, 512kB, and so on.
Mangling can be as simple as mem[i]++

Regards
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