#include <stdio.h>
+#include <math.h>
#include <string.h>
#include <stdlib.h>
#include <getopt.h>
unsigned num_sources = 0;
unsigned room_sources = 0;
+unsigned num_senders = 128;
+unsigned do_listen = 1;
+
const static struct option longopts[] = {
{ "source-list", required_argument, NULL, 's' },
{ "destination-list", required_argument, NULL, 'd' },
+ { "num-senders", required_argument, NULL, 'n' },
{ "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: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 'p':
port = atoi(optarg);
break;
+ case 'o':
+ do_listen = 0;
+ break;
case -1:
return; // end of argument list
default:
}
}
+void *sender_worker(void *arg)
+{
+ unsigned i;
+ int sock;
+ char buf[65536];
+
+ for (i = 0; i < 65536; ++i)
+ buf[i] = rand() & 0xff;
+
+ for (i = 0; i < 1000; ++i) {
+ unsigned src_num = (unsigned)(num_sources * gen_uniform_random());
+ unsigned dst_num = (unsigned)(num_destinations * gen_uniform_random());
+ unsigned num_bytes = (unsigned)gen_pareto_random(1048576.0, 1.0);
+ struct sockaddr_in sin;
+
+ sock = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP);
+ if (sock == -1) {
+ perror("socket()");
+ exit(1);
+ }
+
+ // FIXME: bind to the right source
+
+ sin.sin_family = AF_INET;
+ sin.sin_port = htons(port);
+ sin.sin_addr = destinations[dst_num];
+
+ fprintf(stderr, "connecting %u\n", i);
+
+ if (connect(sock, (struct sockaddr *)&sin, sizeof(sin)) == -1) {
+ perror("connect()");
+ exit(1);
+ }
+
+ fprintf(stderr, "connected\n");
+
+ while (num_bytes > 0) {
+ unsigned bytes_to_send = num_bytes;
+ unsigned ret;
+
+ if (bytes_to_send > 65536) {
+ bytes_to_send = 65536;
+ }
+
+ ret = send(sock, buf, bytes_to_send, MSG_NOSIGNAL);
+ if (ret == -1) {
+ perror("send()");
+ exit(1);
+ }
+
+ num_bytes -= ret;
+ }
+ fprintf(stderr, "sent\n");
+
+ close(sock);
+ }
+
+ pthread_exit(0);
+}
+
void *receiver_worker(void *arg)
{
int sock = (int)arg;
char buf[65536];
- printf("Received worker for socket %u\n", sock);
-
for ( ;; ) {
int ret = read(sock, buf, 65536);
if (ret == 0)
// FIXME: update stats here
}
-
- printf("Socket %u done\n", sock);
if (close(sock) == -1) {
perror("close()");
int main(int argc, char **argv)
{
int server_sock;
+ unsigned i;
+ pthread_attr_t attr;
parse_options(argc, argv);
fprintf(stderr, "Missing or empty source or destination host list. Aborting.\n");
}
- server_sock = get_server_socket(port);
+ 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);
+ }
+
+ 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);
+ }
- // FIXME: fire off sender workers here
+ // 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);
+ }
+ }
/*
* Listen for incoming connections, spawning off one receiver
* thread for each (which will just gobble up the data until
* we're done).
*/
+ if (!do_listen) {
+ sleep(3600);
+ exit(0);
+ }
+
for ( ;; ) {
struct sockaddr_in addr;
socklen_t addr_len = sizeof(addr);
pthread_t thread;
- pthread_attr_t attr;
int sock = accept(server_sock, (struct sockaddr *)&addr, &addr_len);
if (sock == -1) {
exit(1);
}
- // 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_create(&thread, &attr, receiver_worker, (void *)sock) != 0) {
perror("pthread_create()");
exit(1);
projects / jam / blobdiff