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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <pthread.h>
static struct thread_data {
unsigned long mib;
} td;
static void *worker(void *data)
{
struct thread_data *td = data;
unsigned long index;
size_t size;
char *buf;
int i, first = 1;
size = td->mib * 1024UL * 1024UL;
buf = malloc(size);
for (i = 0; i < 100000; i++) {
for (index = 0; index + 4096 < size; index += 4096)
memset(&buf[index+512], 0x89, 512);
if (first) {
printf("loop%d: did %lu MiB\n", i+1, td->mib);
first = 0;
}
}
free(buf);
return NULL;
}
int main(int argc, char *argv[])
{
unsigned long mib, threads;
pthread_t *pthreads;
int i;
if (argc < 3) {
printf("%s: <MiB per thread> <threads>\n", argv[0]);
return 1;
}
mib = strtoul(argv[1], NULL, 10);
threads = strtoul(argv[2], NULL, 10);
if (threads < 1 || threads > 65536) {
printf("%s: invalid 'threads' argument\n", argv[0]);
return 1;
}
pthreads = calloc(threads, sizeof(pthread_t));
td.mib = mib;
for (i = 0; i < threads; i++)
pthread_create(&pthreads[i], NULL, worker, &td);
for (i = 0; i < threads; i++) {
void *ret;
pthread_join(pthreads[i], &ret);
}
return 0;
}
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