//bench/bw_pxmsg.c

1  #include "unpipc.h"

2  #define NAME "bw_pxmsg"

3  void reader(int, mqd_t, int);

4  void writer(int, mqd_t);

5  void *buf;

6  int totalnbytes, xfersize;

7  int

8  main(int argc, char **argv)

9  {

10  int i, nloop, contpipe[2];

11  mqd_t mq;

12  pid_t childpid;

13  struct mq_attr attr;

14  if (argc != 4)

15   err_quit("usage: bw_pxmsg <#loops> <#mbytes> <#bytes/write>");

16  nloop = atoi(argv[1]);

17  totalnbytes = atoi(argv[2]) * 1024 * 1024;

18  xfersize = atoi(argv[3]);

19  buf = Valloc(xfersize);

20  Touch(buf, xfersize);

21  Pipe(contpipe);

22  mq_unlink(Px_ipc_name(NAME)); /* error OK */

23  attr.mq_maxmsg = 4;

24  attr.mq_msgsize = xfersize;

25  mq = Mq_open(Px_ipc_name(NAME), O_RDWR | O_CREAT, FILE_MODE, &attr);

26  if ((childpid = Fork()) == 0) {

27   writer(contpipe[0], mq); /* child */

28   exit(0);

29  }

30  /* 4parent */

31  Start_time();

32  for (i = 0; i < nloop; i++)

33   reader(contpipe[1], mq, totalnbytes);

34  printf("bandwidth: %.3f MB/sec\n",

35  totalnbytes / Stop_time() * nloop);

36  kill(childpid, SIGTERM);

37  Mq_close(mq);

38  Mq_unlink(Px_ipc_name(NAME));

39  exit(0);

40 }