I'm having a very difficult problem getting valgrind to execute a
program which allocates large amounts of memory (> 20 Gb)
When the program runs by itself, all the malloc calls are successful.
However when I run it with valgrind's memcheck or massif tools (v
3.6.0), a malloc call fails (which is trying to allocate around 6.4 Gb).
I am running the program with:
> valgrind --main-stacksize=100000000 --max-stackframe=100000000 ./eef_main
Here is the relevant output:
==808== Warning: set address range perms: large range [0x5b5c5040,
0x3564cd040) (undefined)
==808== Warning: set address range perms: large range [0x40d985040,
0x70888d040) (undefined)
pde_alloc: sparse matrix allocs failed: Success: nzval = 0x40d985040,
nzcol = (nil), rowptr = 0x58e9a6e0
==808== Warning: set address range perms: large range [0x5b5c5030,
0x3564cd050) (noaccess)
==808== Warning: set address range perms: large range [0x40d985030,
0x70888d050) (noaccess)
The corresponding code snippet is:
w->rowptr = malloc((PDE_MAT_SIZE2 + 1) * sizeof(int));
w->nzval = malloc(PDE_MAT_SIZE1 * PDE_MAT_SIZE2 * sizeof(double));
w->nzcol = malloc(PDE_MAT_SIZE1 * PDE_MAT_SIZE2 * sizeof(int));
if (w->nzval == 0 || w->nzcol == 0 || w->rowptr == 0)
{
fprintf(stderr, "pde_alloc: sparse matrix allocs failed: %s:
nzval = %p, nzcol = %p, rowptr = %p\n", strerror(errno), w->nzval,
w->nzcol, w->rowptr);
pde_free(w);
return 0;
}
In this code, PDE_MAT_SIZE1 = PDE_MAT_SIZE2 = 40000. Therefore the
'nzval' call is allocating 12.8Gb and the 'nzcol' is allocating 6.4 Gb.
(sizeof(double) = 8, sizeof(int) = 4)
The machine has 50Gb of ram and both of these calls are successful
without using valgrind.
Furthermore, it appears that the valgrind malloc function does not set
errno to the appropriate value, since the output says "Success" even
when the pointer is null.
Any assistance is appreciated!
Patrick
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