prof-test.c

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>

int sink;

void doSomething() {
  for (int i = 0; i < 1000000; ++i) {
    sink += i;
  }
}

int main() {
  struct sockaddr_in sa;
  memset(&sa, 0, sizeof(sa));

  sa.sin_family = AF_INET;
  sa.sin_port = htons(4242);
  sa.sin_addr.s_addr = htonl(INADDR_LOOPBACK);

  int fd = socket(PF_INET, SOCK_DGRAM, IPPROTO_UDP);

  int len = 1000;
  void* buf = malloc(len);

  for (int i = 0; i < 1000; i++) {
    sendto(fd, buf, len, 0, &sa, sizeof(sa));
    doSomething();
  }
}