SUMMARY: memory testing program
2007-12-24 21:26:00
1 - I liked this most, but it doesn't work on my Sun clone / autoclient. :-(
- one might use sum instead of wc, or kmem instead of mem.
# while true; do
> wc -c /dev/mem &
> wc -c /dev/mem &
> wc -c /dev/mem &
> wc -c /dev/mem &
> sleep 10 &
> done
2 - Sun VTS available from www.sun.com.
- downloaded, but not used yet.
3 - prom memory test ... seems not to be available on the clone proms. :-(
4 - eeprom: setenv diag-switch=true
- on this box, it displays memory banks / sizes, but does not test. :-(
5 - ftp://playground.sun.com/pub/memtool.
- downloaded, but not tested yet.
Thanks for all your help. The only reason I have not tested any of the tools
yet as I was having too much fun abusing my system with a small test program
I was writing. Interesting learning exercise; I've attached that code below.
Using it never revealed the problem, so it might not be sufficient ... or
as someone suggested it could be a sporadic CPU problem. Hope not.
Thanks again,
Don
#define __EXTENSIONS__
#include <malloc.h>
#include <errno.h>
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <sys/mman.h>
#define MAXLONGLONG (((unsigned long) (-1)) >> 1)
#define MINLONGLONG (((unsigned long) (-1)) ^ MAXLONGLONG)
void *malloc_and_lock(size_t *size)
{
void *ptr, *res;
size_t min;
min = sysconf(_SC_PAGESIZE);
*size = min * 100*1024; /* 100k mem pages */
if((res = alloca(min)) == NULL) /* reserve stack for printf */
return(NULL);
while(*size > min)
{
if((ptr = valloc(*size)) != NULL) /* valloc OK */
{
if(mlock(ptr, *size) == 0) /* mlock OK */
return(ptr); /* frees res */
else
free(ptr);
}
*size >>= 1; /* valloc() or mlock() failed */
/* reduce size and try again */
}
return(NULL); /* frees res */
}
int main()
{
long long *check, msb, not_msb;
void *ptr;
size_t size, i, nel, sum = 0;
while(1)
{
if((ptr = malloc_and_lock(&size)) == NULL)
break;
sum += size;
printf("largest locakable block is %d bytes\n", size);
fflush(stdout);
nel = size / sizeof(*check);
printf("%d long longs\n", nel);
fflush(stdout);
check = ptr;
not_msb = MAXLONGLONG; /* odd parity, all but MSB on */
msb = MINLONGLONG; /* odd parity, only MSB on */
for(i = 0; i < nel; ++i)
{
check[i] = 0; /* even parity, all bits on */
check[i] = -1; /* even parity, all bits off */
check[i] = not_msb; /* odd parity */
check[i] = msb;
if((i & 4095) == 0)
printf("%d\r", i);
}
printf("done \n");
fflush(stdout);
}
printf("checked %d bytes of RAM\n", sum);
fflush(stdout);
return(0); /* unlocks and frees mem */
}
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