#include <stdio.h>
+#include <math.h>
#include <string.h>
#include <stdlib.h>
#include <getopt.h>
#include <pthread.h>
#include <sys/socket.h>
#include <netinet/in.h>
+#include <sys/epoll.h>
+#include <sys/ioctl.h>
+#include <errno.h>
unsigned short port = 2007;
+unsigned update_frequency = 1048576;
struct in_addr *destinations = NULL;
unsigned num_destinations = 0;
unsigned num_sources = 0;
unsigned room_sources = 0;
+unsigned num_senders = 128;
+unsigned num_sockets_per_sender = 16;
+unsigned num_receivers = 128;
+unsigned do_listen = 1;
+
+// quite arbitrary, should probably be a bit higher than num_sockets_per_sender
+unsigned epoll_room_in_receiver = 128;
+
+unsigned long long total_bytes_received = 0;
+pthread_mutex_t receive_mutex = PTHREAD_MUTEX_INITIALIZER;
+
+unsigned long long total_bytes_sent = 0;
+pthread_mutex_t send_mutex = PTHREAD_MUTEX_INITIALIZER;
+
const static struct option longopts[] = {
- { "source-file", required_argument, NULL, 's' },
- { "destination-file", required_argument, NULL, 'd' },
+ { "source-list", required_argument, NULL, 's' },
+ { "destination-list", required_argument, NULL, 'd' },
+ { "num-senders", required_argument, NULL, 'n' },
+ { "num-sockets-per-sender", required_argument, NULL, 'N' },
+ { "num-receivers", required_argument, NULL, 'r' },
{ "port", required_argument, NULL, 'p' },
+ { "sender-only", no_argument, NULL, 'o' },
{ NULL, 0, NULL, 0 }
};
+// generates from [0,1>
+double gen_uniform_random()
+{
+ return rand() / (RAND_MAX+1.0);
+}
+
+double gen_pareto_random(double min, double k)
+{
+ double u = gen_uniform_random();
+ return min * pow(u, -1.0 / k);
+}
+
void read_ip_list(char *filename, struct in_addr **addr_list, unsigned *num, unsigned *room)
{
char buf[256];
int option_index = 0;
for ( ;; ) {
- int c = getopt_long(argc, argv, "s:d:p:", longopts, &option_index);
+ int c = getopt_long(argc, argv, "s:d:n:N:r:p:o", longopts, &option_index);
switch (c) {
case 's':
read_ip_list(optarg, &sources, &num_sources, &room_sources);
case 'd':
read_ip_list(optarg, &destinations, &num_destinations, &room_destinations);
break;
+ case 'n':
+ num_senders = atoi(optarg);
+ break;
+ case 'r':
+ num_receivers = atoi(optarg);
+ break;
+ case 'N':
+ num_sockets_per_sender = atoi(optarg);
+ break;
case 'p':
port = atoi(optarg);
break;
+ case 'o':
+ do_listen = 0;
+ break;
case -1:
return; // end of argument list
default:
}
}
-void *receiver_worker(void *arg)
+struct sender {
+ int fd;
+ unsigned long long bytes_left;
+};
+
+void generate_new_sender(int ep_fd, struct sender *s)
{
- int sock = (int)arg;
+ int sock, one = 1;
+ unsigned src_num, dst_num;
+ unsigned long long num_bytes;
+ struct sockaddr_in sin;
+ struct epoll_event ev;
+
+ sock = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP);
+ if (sock == -1) {
+ perror("socket()");
+ exit(1);
+ }
+
+ // find the right parameters
+ src_num = (unsigned)(num_sources * gen_uniform_random());
+ dst_num = (unsigned)(num_destinations * gen_uniform_random());
+ num_bytes = (unsigned)gen_pareto_random(1048576.0, 1.0);
+
+ // FIXME: bind to the right source
+
+ if (ioctl(sock, FIONBIO, &one) == -1) {
+ perror("FIONBIO");
+ exit(1);
+ }
+
+ sin.sin_family = AF_INET;
+ sin.sin_port = htons(port);
+ sin.sin_addr = destinations[dst_num];
+
+ // non-blocking connect (will be detected by epoll later)
+ if (connect(sock, (struct sockaddr *)&sin, sizeof(sin)) == -1 && errno != EINPROGRESS) {
+ perror("connect()");
+ exit(1);
+ }
+
+ // stick it in the epoll set (FIXME: make edge-triggered?)
+ ev.events = EPOLLOUT | EPOLLHUP | EPOLLERR;
+ ev.data.ptr = s;
+
+ s->fd = sock;
+ s->bytes_left = num_bytes;
+
+ if (epoll_ctl(ep_fd, EPOLL_CTL_ADD, sock, &ev) == -1) {
+ perror("EPOLL_CTL_ADD");
+ exit(1);
+ }
+}
+
+void *sender_worker(void *arg)
+{
+ unsigned i;
char buf[65536];
+ unsigned long long bytes_sent = 0;
+ int ep_fd;
+ struct epoll_event *events;
+
+ ep_fd = epoll_create(num_sockets_per_sender);
+ if (ep_fd == -1) {
+ perror("epoll_create");
+ exit(1);
+ }
+
+ // malloc, since there might not be enough room on the stack
+ events = (struct epoll_event *)malloc(sizeof(struct epoll_event) * num_sockets_per_sender);
+ if (events == NULL) {
+ perror("malloc");
+ exit(1);
+ }
- printf("Received worker for socket %u\n", sock);
+ // fill the buffer with random junk
+ for (i = 0; i < 65536; ++i)
+ buf[i] = rand() & 0xff;
+
+ // allocate all the senders
+ for (i = 0; i < num_sockets_per_sender; ++i) {
+ struct sender *s = (struct sender *)malloc(sizeof(struct sender));
+ if (s == NULL) {
+ perror("malloc()");
+ exit(1);
+ }
+
+ generate_new_sender(ep_fd, s);
+ }
for ( ;; ) {
- int ret = read(sock, buf, 65536);
- if (ret == 0)
- break;
+ int num_active = epoll_wait(ep_fd, events, num_sockets_per_sender, -1);
+ if (num_active == -1) {
+ if (errno == EINTR)
+ continue;
+ perror("epoll_wait");
+ exit(1);
+ }
+
+ for (i = 0; i < num_active; ++i) {
+ struct sender *s = (struct sender *)events[i].data.ptr;
+ unsigned long long bytes_to_send = s->bytes_left;
+ unsigned ret;
- // FIXME: update stats here
+ if (bytes_to_send > 65536) {
+ bytes_to_send = 65536;
+ }
+
+ ret = send(s->fd, buf, bytes_to_send, MSG_NOSIGNAL);
+ if (ret == -1) {
+ if (errno == EAGAIN || errno == EINTR)
+ continue;
+
+ perror("send()");
+ exit(1);
+ }
+
+ s->bytes_left -= ret;
+ bytes_sent += ret;
+
+ // update the central counter after every 1MB (8ms
+ // at gigabit speeds, should be enough) of sent data
+ if (bytes_sent > update_frequency) {
+ pthread_mutex_lock(&send_mutex);
+ total_bytes_sent += bytes_sent;
+ pthread_mutex_unlock(&send_mutex);
+
+ bytes_sent = 0;
+ }
+
+ if (s->bytes_left == 0) {
+ if (epoll_ctl(ep_fd, EPOLL_CTL_DEL, s->fd, NULL) == -1) {
+ perror("EPOLL_CTL_DEL");
+ exit(1);
+ }
+ close(s->fd);
+ generate_new_sender(ep_fd, s);
+ }
+ }
}
- printf("Socket %u done\n", sock);
+ pthread_mutex_lock(&send_mutex);
+ total_bytes_sent += bytes_sent;
+ pthread_mutex_unlock(&send_mutex);
+
+ free(events);
+ close(ep_fd);
+
+ pthread_exit(0);
+}
+
+void *receiver_worker(void *arg)
+{
+ int server_sock = (int)arg;
+ char buf[65536];
+ unsigned long long bytes_received = 0;
+ int ep_fd, i;
+ struct epoll_event ev, *events;
+
+ ep_fd = epoll_create(num_sockets_per_sender);
+ if (ep_fd == -1) {
+ perror("epoll_create");
+ exit(1);
+ }
+
+ // malloc, since there might not be enough room on the stack
+ events = (struct epoll_event *)malloc(sizeof(struct epoll_event) * epoll_room_in_receiver);
+ if (events == NULL) {
+ perror("malloc");
+ exit(1);
+ }
- if (close(sock) == -1) {
- perror("close()");
+ // stick the receiver socket in the epoll set
+ ev.events = EPOLLIN;
+ ev.data.fd = server_sock;
+
+ if (epoll_ctl(ep_fd, EPOLL_CTL_ADD, server_sock, &ev) == -1) {
+ perror("EPOLL_CTL_ADD");
exit(1);
}
+ for ( ;; ) {
+ int num_active = epoll_wait(ep_fd, events, epoll_room_in_receiver, -1);
+ if (num_active == -1) {
+ if (errno == EINTR)
+ continue;
+ perror("epoll_wait");
+ exit(1);
+ }
+
+ for (i = 0; i < num_active; ++i) {
+ int sock = events[i].data.fd;
+ int ret;
+ if (sock == server_sock) {
+ struct sockaddr_in addr;
+ int sock;
+ socklen_t addr_len = sizeof(addr);
+
+ sock = accept(server_sock, (struct sockaddr *)&addr, &addr_len);
+ if (sock == -1) {
+ if (errno == EAGAIN || errno == EINTR) {
+ // another thread snatched it, ignore
+ continue;
+ } else {
+ perror("accept()");
+ exit(1);
+ }
+ }
+
+ // add it to the epoll set
+ ev.events = EPOLLIN | EPOLLHUP | EPOLLERR;
+ ev.data.fd = sock;
+
+ if (epoll_ctl(ep_fd, EPOLL_CTL_ADD, sock, &ev) == -1) {
+ perror("EPOLL_CTL_ADD");
+ exit(1);
+ }
+ continue;
+ }
+
+ ret = read(sock, buf, 65536);
+ if (ret == 0) {
+ if (epoll_ctl(ep_fd, EPOLL_CTL_DEL, sock, NULL) == -1) {
+ perror("EPOLL_CTL_DEL");
+ exit(1);
+ }
+ close(sock);
+ continue;
+ }
+
+ bytes_received += ret;
+
+ // update the central counter after every 1MB (8ms
+ // at gigabit speeds, should be enough) of received data
+ if (bytes_received > update_frequency) {
+ pthread_mutex_lock(&receive_mutex);
+ total_bytes_received += bytes_received;
+ pthread_mutex_unlock(&receive_mutex);
+
+ bytes_received = 0;
+ }
+ }
+ }
+
+ pthread_mutex_lock(&receive_mutex);
+ total_bytes_received += bytes_received;
+ pthread_mutex_unlock(&receive_mutex);
+
pthread_exit(0);
}
+// We're keeping this separate receiver dispatcher around because we might eventually
+// want to move away from the model where each receiver worker does the accept(). Thus,
+// it makes sense to keep this dispatcher around, even though all it does at the moment
+// is spawn off a few new threads and then die itself.
+void *receiver_dispatcher(void *arg)
+{
+ int server_sock = (int)arg;
+ int i;
+ pthread_attr_t attr;
+ pthread_t thread;
+
+ // FIXME: these do not really set errno
+ if (pthread_attr_init(&attr) != 0) {
+ perror("pthread_attr_init()");
+ exit(1);
+ }
+
+ if (pthread_attr_setstacksize(&attr, PTHREAD_STACK_MIN + 65536 + 0x4000) != 0) {
+ perror("pthread_attr_setstacksize");
+ exit(1);
+ }
+
+ if (pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED) != 0) {
+ perror("pthread_attr_setdetachstate");
+ exit(1);
+ }
+
+ for (i = 0; i < num_receivers; ++i) {
+ if (pthread_create(&thread, &attr, receiver_worker, (void *)server_sock) != 0) {
+ perror("pthread_create()");
+ exit(1);
+ }
+ }
+
+ return NULL;
+}
+
int get_server_socket(unsigned short port)
{
int server_sock;
int main(int argc, char **argv)
{
int server_sock;
+ unsigned i;
+ pthread_attr_t attr;
parse_options(argc, argv);
- server_sock = get_server_socket(port);
- // FIXME: fire off sender workers here
+ if (destinations == NULL || sources == NULL) {
+ fprintf(stderr, "Missing or empty source or destination host list. Aborting.\n");
+ exit(1);
+ }
- /*
- * Listen for incoming connections, spawning off one receiver
- * thread for each (which will just gobble up the data until
- * we're done).
- */
- for ( ;; ) {
- struct sockaddr_in addr;
- socklen_t addr_len = sizeof(addr);
- pthread_t thread;
- pthread_attr_t attr;
+ if (do_listen) {
+ server_sock = get_server_socket(port);
+ }
+
+ printf("Sending data on port %u from %u sources to %u destinations.\n\n",
+ port, num_sources, num_destinations);
+
+ // FIXME: these do not really set errno
+ if (pthread_attr_init(&attr) != 0) {
+ perror("pthread_attr_init()");
+ exit(1);
+ }
- int sock = accept(server_sock, (struct sockaddr *)&addr, &addr_len);
- if (sock == -1) {
- perror("accept()");
- exit(1);
- }
+ if (pthread_attr_setstacksize(&attr, PTHREAD_STACK_MIN + 65536 + 0x4000) != 0) {
+ perror("pthread_attr_setstacksize");
+ exit(1);
+ }
- // FIXME: these do not really set errno
- if (pthread_attr_init(&attr) != 0) {
- perror("pthread_attr_init()");
+ if (pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED) != 0) {
+ perror("pthread_attr_setdetachstate");
+ exit(1);
+ }
+
+ // Fire off the master receiver.
+ if (do_listen) {
+ pthread_t thread;
+ if (pthread_create(&thread, &attr, receiver_dispatcher, (void *)server_sock) != 0) {
+ perror("pthread_create()");
exit(1);
}
+ }
- if (pthread_attr_setstacksize(&attr, PTHREAD_STACK_MIN + 65536 + 0x4000) != 0) {
- perror("pthread_attr_setstacksize");
- exit(1);
- }
+ printf("Waiting five seconds before starting senders...\n");
+ sleep(5);
- if (pthread_create(&thread, &attr, receiver_worker, (void *)sock) != 0) {
+ // Fire off sender workers.
+ for (i = 0; i < num_senders; ++i) {
+ pthread_t thread;
+
+ if (pthread_create(&thread, &attr, sender_worker, NULL) != 0) {
perror("pthread_create()");
exit(1);
}
}
+ // Just stay around collecting statistics until we're done.
+ for ( ;; ) {
+ unsigned long long sent, received;
+ static unsigned long long last_sent = 0, last_received = 0;
+ double recv_rate, send_rate;
+
+ pthread_mutex_lock(&send_mutex);
+ sent = total_bytes_sent;
+ pthread_mutex_unlock(&send_mutex);
+
+ pthread_mutex_lock(&receive_mutex);
+ received = total_bytes_received;
+ pthread_mutex_unlock(&receive_mutex);
+
+ send_rate = (sent - last_sent) * 8.0 / 1048576.0;
+ recv_rate = (received - last_received) * 8.0 / 1048576.0;
+
+ printf("%12llu %12llu %5.0f Mbit/sec %5.0f Mbit/sec\n", sent, received,
+ send_rate, recv_rate);
+
+ last_sent = sent;
+ last_received = received;
+
+ sleep(1);
+ }
+
exit(0);
}
projects / jam / blobdiff