X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=jam.c;h=0141e5ba45398df0f8cac42559eca84e85b166ae;hb=bc98f29eed4e03c5dc9b78bf4978ec7d490a5521;hp=581d51c91200a69696aabe8d39e9519b19c250ca;hpb=b1ce9404c6aaf3105377489bfc8d0bf27ad67b3b;p=jam diff --git a/jam.c b/jam.c index 581d51c..0141e5b 100644 --- a/jam.c +++ b/jam.c @@ -13,6 +13,7 @@ #include unsigned short port = 2007; +unsigned update_frequency = 1048576; struct in_addr *destinations = NULL; unsigned num_destinations = 0; @@ -24,7 +25,11 @@ 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; @@ -148,21 +153,14 @@ struct sender { unsigned long long bytes_left; }; -void generate_new_sender(int ep_fd) +void generate_new_sender(int ep_fd, struct sender *s) { int sock, one = 1; unsigned src_num, dst_num; unsigned long long num_bytes; struct sockaddr_in sin; struct epoll_event ev; - struct sender *s; - s = (struct sender *)malloc(sizeof(struct sender)); - if (s == NULL) { - perror("malloc()"); - exit(1); - } - sock = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP); if (sock == -1) { perror("socket()"); @@ -230,8 +228,15 @@ void *sender_worker(void *arg) buf[i] = rand() & 0xff; // allocate all the senders - for (i = 0; i < num_sockets_per_sender; ++i) - generate_new_sender(ep_fd); + 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 num_active = epoll_wait(ep_fd, events, num_sockets_per_sender, -1); @@ -263,7 +268,7 @@ void *sender_worker(void *arg) // update the central counter after every 1MB (8ms // at gigabit speeds, should be enough) of sent data - if (bytes_sent > 1048576) { + if (bytes_sent > update_frequency) { pthread_mutex_lock(&send_mutex); total_bytes_sent += bytes_sent; pthread_mutex_unlock(&send_mutex); @@ -273,13 +278,11 @@ void *sender_worker(void *arg) if (s->bytes_left == 0) { if (epoll_ctl(ep_fd, EPOLL_CTL_DEL, s->fd, NULL) == -1) { - perror("EPOLL_CTL_ADD"); + perror("EPOLL_CTL_DEL"); exit(1); } close(s->fd); - - free(s); - generate_new_sender(ep_fd); + generate_new_sender(ep_fd, s); } } } @@ -296,44 +299,112 @@ void *sender_worker(void *arg) void *receiver_worker(void *arg) { - int sock = (int)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); + } + + // 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 ret = read(sock, buf, 65536); - if (ret == 0) - break; + int num_active = epoll_wait(ep_fd, events, epoll_room_in_receiver, -1); + if (num_active == -1) { + 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) { + // another thread snatched it, ignore + continue; + } else { + perror("accept()"); + exit(1); + } + } - bytes_received += ret; + // 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; + } - // update the central counter after every 1MB (8ms - // at gigabit speeds, should be enough) of received data - if (bytes_received > 1048576) { - pthread_mutex_lock(&receive_mutex); - total_bytes_received += bytes_received; - pthread_mutex_unlock(&receive_mutex); + bytes_received += ret; - bytes_received = 0; + // 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; + } } } - if (close(sock) == -1) { - perror("close()"); - exit(1); - } - 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) { @@ -351,23 +422,8 @@ void *receiver_dispatcher(void *arg) 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; - - int sock = accept(server_sock, (struct sockaddr *)&addr, &addr_len); - if (sock == -1) { - perror("accept()"); - exit(1); - } - - if (pthread_create(&thread, &attr, receiver_worker, (void *)sock) != 0) { + for (i = 0; i < num_receivers; ++i) { + if (pthread_create(&thread, &attr, receiver_worker, (void *)server_sock) != 0) { perror("pthread_create()"); exit(1); }