INOUE Seiichiro <inoue <at> ariel-networks.com> writes:
>
> Hi,
>
> > Checking my module with a stress test (1440 reqs/min) I'm observing ,
> > with top, that SIZE and RSS of httpd processes are growing.
>
> I recommend you to check apr_allocator_max_free_set().
>
> The following sample code shows the effect.
> Without calling apr_allocator_max_free_set(), you can find the memory usage
is growing rapidly.
>
> ///////////////// sample code starts
> /* memory pool leak test.
> * <at> remark No error checks */
> #include <stdio.h>
> #include <apr_general.h>
>
> int main(int argc, char **argv)
> {
> apr_pool_t *mp;
> int i;
>
> apr_initialize();
> apr_pool_create(&mp, NULL);
>
> /* XXX Without this setting, memory usage is growing more than expected
*/
> #define MY_POOL_MAX_FREE_SIZE 32
> {
> apr_allocator_t *pa = apr_pool_allocator_get(mp);
> if (pa) {
> apr_allocator_max_free_set(pa, MY_POOL_MAX_FREE_SIZE);
> }
> }
>
> #define BASE_ALLOC_SIZE (8*1024)
> i = 0;
> while (1) {
> apr_palloc(mp, BASE_ALLOC_SIZE + i);
> i++;
> if (i % 10000 == 0) {
> puts("press enter key (please check memory usage)");
> getchar();
> }
> apr_pool_clear(mp);
> }
> apr_terminate();
> return 0;
> }
> ///////////////// sample code ends
>
> - INOUE Seiichiro <inoue <at> ariel-networks.com>
>
>
there would be memory leak, it seems that there is no-effect by calling
apr_allocator_max_free_set.
#define SIZE (10*1024*1024)
apr_pool_t *p;
apr_initialize();
atexit(apr_terminate);
apr_allocator_t *my_allocator_ptr = NULL;
apr_pool_t *system_pool = NULL;
if( apr_allocator_create(&my_allocator_ptr) == APR_SUCCESS ){
printf("created my_allocator_ptr success\n");
apr_allocator_max_free_set(my_allocator_ptr, SIZE);
printf("set max free size for my_allocator_ptr to %d\n", SIZE);
}
apr_pool_create(&system_pool, NULL);
apr_pool_create_ex(&p, system_pool, (apr_abortfunc_t)
failed_to_allocate, my_allocator_ptr);
apr_allocator_owner_set(my_allocator_ptr, p);
apr_allocator_t *pa = apr_pool_allocator_get(p);
printf("pa %x my_allocator_ptr %x\n\n", pa, my_allocator_ptr);
int chunk_size;
void *ptr = NULL;
chunk_size = 1024*1024;
ptr = apr_pcalloc(p, chunk_size);
for(int i = 1; ptr != NULL; i++){
ptr = apr_pcalloc(p, chunk_size);
if( ptr != NULL ){
printf("pass %3.3d: allocated %d bytes\n", i,
chunk_size);
}
else{
printf("pass %3.3d: ***failed to allocate %d bytes\n",
i, chunk_size);
}
}
