RFC: replace ptmalloc2

[Jörn Engel]

On Wed, Oct 15, 2014 at 12:00:31AM -0400, Rich Felker wrote:
> 
> What benchmark are you using? I'd like to run it on my malloc.

Something pretty primitive that grew out of a simple memhog.  Use at
your own risk.

Jörn

--
If every man who wrote a story which was indirectly inspired by Poe
were to pay a tithe toward a monument it would be such as would dwarf
the pyramids.
-- Sir Arthur Conan Doyle

---

#include <pthread.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "dlmalloc.h"

#define NO_WORKERS	8
#define MAX_ALLOC	((1ull << 31) / NO_WORKERS)

static void *worker(void *arg)
{
	unsigned long *p;
	int i, e;
	uint64_t subtotal = 0;

	for (i = 0; ;i++) {
		for (e = 0; e < 17; e++) {
			size_t size = 5 << e;
			subtotal += size;
			p = dlmalloc(size);
			if (!p)
				return NULL;
			memset(p, 1, size);
		}
		if (i % 1000 == 0 || subtotal >= MAX_ALLOC) {
			if (subtotal >= MAX_ALLOC) {
				printf("%p: done\n", &subtotal);
				return NULL;
			}
		}
	}
}

int main(void)
{
	int i, err;
	pthread_t tid[NO_WORKERS];

	for (i = 0; i < NO_WORKERS; i++) {
		err = pthread_create(tid + i, NULL, worker, NULL);
		if (err)
			return 1;
	}
	for (i = 0; i < NO_WORKERS; i++) {
		pthread_join(tid[i], NULL);
	}
	system("cp /proc/`pgrep memhog`/maps .");
	system("cp /proc/`pgrep memhog`/status .");
	return 0;
}