torgerse@udel.edu, , torger@uncecs.edu (Todd Torgersen) (10/12/89)
We recently got two SPARCstation 1 workstations and found a problem
building very long linked lists with "malloc". The following program
crashes our SPARCstations when n=200000
The program runs fine on the sun - 4/110's and also on our host (a sun - 4
/ 280). Has anyone out there experienced this ? Does anyone have a clue
why the machine crashes ? When this program is run on other sun-4's (not
SPARCstations) it will do the sensible thing when n exceeds the available
memory. On a SPARCstation, the machine crashes long before the memory
limit is approached. All machines here are diskless except the server.
Thanks in advance for your help. Todd
(919) 759-5536
#include <stdio.h>
#define CHECKIT 1000
main(argc,argv)
int argc ;
char * argv[] ;
{
struct block {
int data ;
struct block * next ;
} blk ;
struct block *temp ;
struct block *list ;
int count,flag,n ;
/* begin executable code. */
list = NULL ; flag = (0==0) ; count = 0 ;
printf("Enter n : ") ;
scanf( "%d", &n ) ;
while ( (count < n) && flag ) {
temp = list ;
list = (struct block *) malloc( sizeof(blk) ) ;
flag = (NULL != list) ;
if (flag) {
if ( 0 == (count % CHECKIT))
printf("%s: count = %d\n",argv[0],count) ;
list->data = count ;
list->next = temp ;
++count ;
}
else
printf("malloc returns NULL with count = %d\n",count) ;
}
}ozkan@vuse.vanderbilt.edu (Mehmed Ozkan) (10/15/89)
>We recently got two SPARCstation 1 workstations and found a problem >building very long linked lists with "malloc". The following program >crashes our SPARCstations when n=200000 This is what happens if i run your program on our SPARCstation, which has its own disk. Mehmed Ozkan Vanderbilt University. ozkan@vuse.vanderbilt.edu "sp.c" [New file] 41 lines, 781 characters <32>[try] % make sptest cc -sun4 -o sp sptest.c <33>[try] % sptest Enter n :200000 sp: count = 0 sp: count = 1000 . . . sp: count = 193000 sp: count = 194000 sp: count = 195000 sp: count = 196000 sp: count = 197000 sp: count = 198000 sp: count = 199000