git.ozlabs.org Git - ccan/blob - ccan/io/benchmarks/run-different-speed.c

   1 /* Simulate a server with connections of different speeds.  We count
   2  * how many connections complete in 10 seconds. */
   3 #include <ccan/io/io.h>
   4 #include <ccan/time/time.h>
   5 #include <ccan/err/err.h>
   6 #include <sys/types.h>
   7 #include <sys/socket.h>
   8 #include <sys/un.h>
   9 #include <stdlib.h>
  10 #include <unistd.h>
  11 #include <fcntl.h>
  12 #include <errno.h>
  13 #include <stdio.h>
  14 #include <signal.h>
  15
  16 #define REQUEST_SIZE 1024
  17 #define REPLY_SIZE 10240
  18 #define NUM_CONNS 500 /* per child */
  19 #define NUM_CHILDREN 2
  20
  21 static unsigned int completed;
  22
  23 struct client {
  24         char request_buffer[REQUEST_SIZE];
  25         char reply_buffer[REPLY_SIZE];
  26 };
  27
  28 static struct io_op *write_reply(struct io_conn *conn, struct client *client);
  29 static struct io_op *read_request(struct io_conn *conn, struct client *client)
  30 {
  31         return io_read(client->request_buffer, REQUEST_SIZE,
  32                        io_next(conn, write_reply, client));
  33 }
  34
  35 /* once we're done, loop again. */
  36 static struct io_op *write_complete(struct io_conn *conn, struct client *client)
  37 {
  38         completed++;
  39         return read_request(conn, client);
  40 }
  41
  42 static struct io_op *write_reply(struct io_conn *conn, struct client *client)
  43 {
  44         return io_write(client->reply_buffer, REPLY_SIZE,
  45                         io_next(conn, write_complete, client));
  46 }
  47
  48 /* This runs in the child. */
  49 static void create_clients(struct sockaddr_un *addr, int waitfd)
  50 {
  51         struct client data;
  52         int i, sock[NUM_CONNS], speed[NUM_CONNS], done[NUM_CONNS], count = 0;
  53
  54         for (i = 0; i < NUM_CONNS; i++) {
  55                 /* Set speed. */
  56                 speed[i] = (1 << (random() % 10));
  57                 sock[i] = socket(AF_UNIX, SOCK_STREAM, 0);
  58                 if (sock[i] < 0)
  59                         err(1, "creating socket");
  60                 if (connect(sock[i], (void *)addr, sizeof(*addr)) != 0)
  61                         err(1, "connecting socket");
  62                 /* Make nonblocking. */
  63                 fcntl(sock[i], F_SETFD, fcntl(sock[i], F_GETFD)|O_NONBLOCK);
  64                 done[i] = 0;
  65         }
  66
  67         read(waitfd, &i, 1);
  68
  69         for (;;) {
  70                 for (i = 0; i < NUM_CONNS; i++) {
  71                         int ret, bytes = speed[i];
  72                         if (done[i] < REQUEST_SIZE) {
  73                                 if (REQUEST_SIZE - done[i] < bytes)
  74                                         bytes = REQUEST_SIZE - done[i];
  75                                 ret = write(sock[i], data.request_buffer,
  76                                             bytes);
  77                                 if (ret > 0)
  78                                         done[i] += ret;
  79                                 else if (ret < 0 && errno != EAGAIN)
  80                                         goto fail;
  81                         } else {
  82                                 if (REQUEST_SIZE + REPLY_SIZE - done[i] < bytes)
  83                                         bytes = REQUEST_SIZE + REPLY_SIZE
  84                                                 - done[i];
  85                                 ret = read(sock[i], data.reply_buffer,
  86                                             bytes);
  87                                 if (ret > 0) {
  88                                         done[i] += ret;
  89                                         if (done[i] == REQUEST_SIZE + REPLY_SIZE) {
  90                                                 count++;
  91                                                 done[i] = 0;
  92                                         }
  93                                 } else if (ret < 0 && errno != EAGAIN)
  94                                         goto fail;
  95                         }
  96                 }
  97         }
  98 fail:
  99         printf("Child did %u\n", count);
 100         exit(0);
 101 }
 102
 103 static int timeout[2];
 104 static void sigalarm(int sig)
 105 {
 106         write(timeout[1], "1", 1);
 107 }
 108
 109 static struct io_op *do_timeout(struct io_conn *conn, char *buf)
 110 {
 111         return io_break(conn, NULL);
 112 }
 113
 114 static struct io_op *do_timeout_read(struct io_conn *conn, char *buf)
 115 {
 116         return io_read(buf, 1, io_next(conn, do_timeout, buf));
 117 }
 118
 119 int main(int argc, char *argv[])
 120 {
 121         struct client client;
 122         unsigned int i, j;
 123         struct sockaddr_un addr;
 124         struct timespec start, end;
 125         int fd, wake[2];
 126         char buf;
 127
 128         addr.sun_family = AF_UNIX;
 129         sprintf(addr.sun_path, "/tmp/run-different-speed.sock.%u", getpid());
 130
 131         if (pipe(wake) != 0 || pipe(timeout) != 0)
 132                 err(1, "Creating pipes");
 133
 134         fd = socket(AF_UNIX, SOCK_STREAM, 0);
 135         if (fd < 0)
 136                 err(1, "Creating socket");
 137
 138         if (bind(fd, (void *)&addr, sizeof(addr)) != 0)
 139                 err(1, "Binding to %s", addr.sun_path);
 140
 141         if (listen(fd, NUM_CONNS) != 0)
 142                 err(1, "Listening on %s", addr.sun_path);
 143
 144         for (i = 0; i < NUM_CHILDREN; i++) {
 145                 switch (fork()) {
 146                 case -1:
 147                         err(1, "forking");
 148                 case 0:
 149                         close(wake[1]);
 150                         create_clients(&addr, wake[0]);
 151                         break;
 152                 }
 153                 for (j = 0; j < NUM_CONNS; j++) {
 154                         int ret = accept(fd, NULL, 0);
 155                         if (ret < 0)
 156                                 err(1, "Accepting fd");
 157                         /* For efficiency, we share client structure */
 158                         io_new_conn(ret, read_request, NULL, &client);
 159                 }
 160         }
 161
 162         io_new_conn(timeout[0], do_timeout_read, NULL, &buf);
 163
 164         close(wake[0]);
 165         for (i = 0; i < NUM_CHILDREN; i++)
 166                 write(wake[1], "1", 1);
 167
 168         signal(SIGALRM, sigalarm);
 169         alarm(10);
 170         start = time_now();
 171         io_loop();
 172         end = time_now();
 173         close(fd);
 174
 175         printf("%u connections complete (%u ns per conn)\n",
 176                completed,
 177                (int)time_to_nsec(time_divide(time_sub(end, start), completed)));
 178         return 0;
 179 }