QNX/UNIX: Анатомия параллелизма

 // динамически готовим код команды devctl():

 unsigned int DCTL = (blk << 16) + DCMD_SRR;

 cout << " . . . . . waiting ^C . . . . . " << flush;

 // устанавливается реакция на пользовательский ^C

 signal(SIGINT, trap);

 uint64_t num = 0;

 uint8_t *bufin = new uint8_t[blk], *bufou = new uint8_t[blk];

 uint64_t tim = ClockCycles();

 // в зависимости от выбранного механизма передаем с его помощью данные

 if (lowlvl)

  while (true) {

   if (MsgSend(coid, bufou, blk, bufin, blk) == -1)

    exit("exchange data with channel");

   num++;

   if (!conti) break;

  }

 else {

  while (true) {

   if (devctl(fd, DCTL, bufou, blk, NULL) != EOK)

    exit("DEVCTL error");

   num++;

   if (!conti) break;

  }

 }

 tim = ClockCycles() - tim;

 cout << '\r' << (lowlvl ? "message exchange:" : "manager exchange:") <<

  " number = " << num << "; stream = "

  << (double)num * blk / ((double)tim / (double)cps) / 1E6 * 8 <<

  " Mbit/sec" << endl;

 ConnectDetach(coid);

 close(fd);

 delete [] bufin;

 delete [] bufou;

 return EXIT_SUCCESS;

}

В результате мы получаем оценки максимальной плотности потока обмена, достижимые в выбранных (при помощи ключей) условиях на данном процессоре:

# clr -b1

SRR repeater: vers. 1.03

server path: /dev/srr, block size = 1 bytes

CPU speed [c.p.s.]: client = 534639500, server = 534639500

message exchange: number = 906400; stream = 1.54088 Mbit/sec

# clr -b1 -d

SRR repeater: vers. 1.03

server path: /dev/srr, block size = 1

bytes CPU speed [c.p.s.]: client = 534639500, server = 534639500

manager exchange, number = 335725; stream = 0.617311 Mbit/sec

# clr -b10

SRR repeater: vers. 1.03

server path: /dev/srr, block size = 10 bytes

CPU speed [c.p.s.]: client = 534639500, server = 534639500

message exchange: number = 1119211; stream = 15.0758 Mbit/sec

# clr -bl0 -d

SRR repeater: vers. 1.03

server path: /dev/srr, block size = 10 bytes

CPU speed [c.p.s.]: client = 534639500, server = 534639500

manager exchange: number = 316948; stream = 6.1421 Mbit/sec

# clr -b100

SRR repeater: vers. 1.03

server path: /dev/srr, block size = 100 bytes

CPU speed [c.p.s.]: client = 534639500, server = 534639500

message exchange: number = 729460; stream = 122.617 Mbit/sec

# clr -b100 -d

SRR repeater: vers. 1.03

server path: /dev/srr, block size = 100 bytes

CPU speed [c.p.s.]: client = 534639500, server = 534639500

manager exchange: number = 318435, stream = 57.3215 Mbit/sec

# clr -b1000

SRR repeater: vers. 1.03

server path: /dev/srr, block size = 1000 bytes

CPU speed [с.p.s.]: client = 534639500, server = 534639500

message exchange: number = 823535; stream = 1054.65 Mbit/sec

# clr -b1000 -d

SRR repeater: vers. 1.03

server path: /dev/srr, block size = 1000 bytes