threadtest.c

#include <stdio.h>
#include <stdlib.h>
#include <pthread.h>

void *dumb_thread();
main(int argc, char *argv[])
{
     int total = atoi(argv[1]);
     int concurrency = atoi(argv[2]);
     pthread_t pthread[concurrency];
     int i;
     int j;
     for(i = 0; i < total ; i++){
       for(j = 0; j < concurrency; j++){
           pthread_create(&pthread[j], NULL, dumb_thread, NULL);
       }
       for(j = 0; j < concurrency; j++){
         pthread_join(pthread[j], NULL);
       }
     }
     exit(0);
}

void *dumb_thread(){
}

/*
gcc -lpthread threadtest.c -o threadtester
time ./threadtester 400 1000

real	0m13.224s
user	0m1.754s
sys	0m9.383s
*/