// читаем его параметры
if (read(fd, &data, sizeof(result)) == -1)
exit('parameter block read');
cout << ', server = ' << data.cps << endl;
// определяем дескриптор сетевого узла
int32_t node = netmgr_strtond(PATH, NULL);
if (node == -1 && fd > 0 && errno == ENOENT)
node = ND_LOCAL_NODE;
// по адресным данным, полученным ранее по read(), создаем
// канал для прямого обмена сообщениями с тем же процессом
int coid = ConnectAttach(node, data.pid, data.chid, _NTO_SIDE_CHANNEL, 0);
if (coid < 0) exit('connect to message channel');
// 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 << '
' << (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
CPU speed [c.p.s.]: client = 534639500, server = 534639500
manager exchange: number = 367712; stream = 493.455 Mbit/sec
# clr -b10000
SRR repeater: vers. 1 03
server path: /dev/srr, block size = 10000 bytes
CPU speed [c.p.s.]: client = 534639500, server = 534639500
message exchange number = 196479, stream = 2861.27 Mbit/sec
# clr -b10000 -d
SRR repeater: vers. 1.03
server path: /dev/srr, block size = 10000 bytes
CPU speed [c.p.s.]: client = 534639500, server = 534639500
