/*
Measure latency of IPC using tcp sockets
Copyright (c) 2010 Erik Rigtorp <erik@rigtorp.com>
Permission is hereby granted, free of charge, to any person
obtaining a copy of this software and associated documentation
files (the "Software"), to deal in the Software without
restriction, including without limitation the rights to use,
copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the
Software is furnished to do so, subject to the following
conditions:
The above copyright notice and this permission notice shall be
included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
OTHER DEALINGS IN THE SOFTWARE.
*/
#include <stdio.h>
#include <stdlib.h>
#include <sys/socket.h>
#include <string.h>
#include <time.h>
#include <stdint.h>
#include <netdb.h>
int main(int argc, char *argv[])
{
int size;
char *buf;
int64_t count, i, delta;
struct timeval start, stop;
ssize_t len;
size_t sofar;
int yes = 1;
int ret;
struct sockaddr_storage their_addr;
socklen_t addr_size;
struct addrinfo hints;
struct addrinfo *res;
int sockfd, new_fd;
if (argc != 6) {
printf ("usage: tcp_lat <bind-to> <host> <port> <message-size> <roundtrip-count>\n");
return 1;
}
size = atoi(argv[4]);
count = atol(argv[5]);
buf = malloc(size);
if (buf == NULL) {
perror("malloc");
return 1;
}
printf("message size: %i octets\n", size);
printf("roundtrip count: %lli\n", count);
memset(&hints, 0, sizeof hints);
hints.ai_family = AF_UNSPEC; // use IPv4 or IPv6, whichever
hints.ai_socktype = SOCK_STREAM;
hints.ai_flags = AI_PASSIVE; // fill in my IP for me
if ((ret = getaddrinfo(argv[1], NULL, &hints, &res)) != 0) {
fprintf(stderr, "getaddrinfo: %s\n", gai_strerror(ret));
return 1;
}
if ((sockfd = socket(res->ai_family, res->ai_socktype, res->ai_protocol)) == -1) {
perror("socket");
exit(1);
}
if (bind(sockfd, res->ai_addr, res->ai_addrlen) == -1) {
perror("bind");
exit(1);
}
if ((ret = getaddrinfo(argv[2], argv[3], &hints, &res)) != 0) {
fprintf(stderr, "getaddrinfo: %s\n", gai_strerror(ret));
return 1;
}
if (connect(sockfd, res->ai_addr, res->ai_addrlen) == -1) {
perror("connect");
exit(1);
}
gettimeofday(&start);
for (i = 0; i < count; i++) {
if (write(sockfd, buf, size) != size) {
perror("write");
return 1;
}
for (sofar = 0; sofar < size; ) {
len = read(sockfd, buf, size - sofar);
if (len == -1) {
perror("read");
return 1;
}
sofar += len;
}
}
gettimeofday(&stop);
delta = ((stop.tv_sec - start.tv_sec) * (int64_t) 1e6 +
stop.tv_usec - start.tv_usec);
printf("average latency: %lli us\n", delta / (count * 2));
return 0;
}
