Attachment 8667 Details for Bug 19048 – arena_test.c

arena_test.c

arena_test.c (text/plain), 2.55 KB, created by Paulo Andrade on 2015-10-01 21:14:48 UTC

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Creator: Paulo Andrade

Created: 2015-10-01 21:14:48 UTC

Size: 2.55 KB

patch

obsolete

>/*
>
>gcc -o arena_test arena_test.c -pthread -static
>
> */
>
>#include <stdio.h>
>#include <stdlib.h>
>#include <unistd.h>
>#include <pthread.h>
>#include <sys/syscall.h>
>
>#define NUM_THREADS		126
>
>static void
>spawn_threads(void);
>
>typedef struct arena_info	arena_info_t;
>struct arena_info {
>    void	*arena;
>    long	 count;
>};
>
>pthread_mutex_t	 g_lock = PTHREAD_MUTEX_INITIALIZER;
>arena_info_t	*arenas;
>int		 num_arenas;
>pthread_t	 pthreads[NUM_THREADS];
>volatile int	 got_info = 0;
>
>/* This is really ugly, but should be good enough for a (not so) quick
> * way to get the, per thread __libc_tsd_MALLOC value */
>static void
>get__libc_tsd_MALLOC(void)
>{
>    int		 i;
>    FILE	*pp;
>    void	*ptr;
>    char	 buf[4096];
>    if (got_info)
>	return;
>    got_info = 1;
>    sprintf(buf, "./arena_test.pl %d %d", getpid(), syscall(SYS_gettid));
>    pp = popen(buf, "r");
>    while (fscanf(pp, "%x", &ptr) == 1) {
>	for (i = 0; i < num_arenas; ++i) {
>	    if (arenas[i].arena == ptr) {
>		++arenas[i].count;
>		break;
>	    }
>	}
>	if (i == num_arenas) {
>	    if (num_arenas % 16 == 0)
>		arenas = realloc(arenas, sizeof(arena_info_t) * (num_arenas + 16));
>	    arenas[num_arenas].arena = ptr;
>	    arenas[num_arenas].count = 1;
>	    ++num_arenas;
>	}
>    }
>    pclose(pp);
>}
>
>static void *
>run(void *arg)
>{
>    int		  i;
>    long	  delay = (long)arg;
>    void	**alloc;
>    alloc = malloc(sizeof(void*) * 1024);
>    for (i = 0; i < 1024; ++i)
>	alloc[i] = malloc(1024);
>    usleep(delay * 100000);
>    for (i = 0; i < 1024; ++i)
>	free(alloc[i]);
>    free(alloc);
>    pthread_mutex_lock(&g_lock);
>    get__libc_tsd_MALLOC();
>    pthread_mutex_unlock(&g_lock);
>    return NULL;
>}
>
>static void
>spawn_threads(void)
>{
>    int		i;
>    for (i = 0; i < 2; ++i)
>	pthread_create(pthreads + i, NULL, run, (void*)32);
>    for (i = 2; i < 2 + 4; ++i)
>	pthread_create(pthreads + i, NULL, run, (void*)16);
>    for (i = 6; i < 2 + 4 + 8; ++i)
>	pthread_create(pthreads + i, NULL, run, (void*)8);
>    for (i = 14; i < 2 + 4 + 8 + 16; ++i)
>	pthread_create(pthreads + i, NULL, run, (void*)4);
>    for (i = 30; i < 2 + 4 + 8 + 16 + 32; ++i)
>	pthread_create(pthreads + i, NULL, run, (void*)2);
>    for (i = 62; i < 2 + 4 + 8 + 16 + 32 + 64; ++i)
>	pthread_create(pthreads + i, NULL, run, (void*)1);
>    for (i = 0; i < NUM_THREADS; ++i)
>	pthread_join(pthreads[i], NULL);
>}
>
>int
>main(int argc, char *argv[])
>{
>    int		i;
>    while (1) {
>	got_info = 0;
>	spawn_threads();
>	printf("Arena            Count\n");
>	printf("------------------------\n");
>	for (i = 0; i < num_arenas; ++i)
>	    printf("%-16p %-8d\n", arenas[i].arena, arenas[i].count);
>    }
>    return 0;
>}

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