Windows と Linux 間の通信に関するデモを書いています。
性能はギガビットネットワーク環境下でわずか40MB/s。
パフォーマンスをアップグレードする方法はありますか？そして、なぜこんなに遅いのかわかりません。
クライアントとしての Windows のコード
#include "stdafx.h"
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#include <winsock2.h>
#include <ws2tcpip.h>
#include <stdlib.h>
#include <stdio.h>
// Need to link with Ws2_32.lib, Mswsock.lib, and Advapi32.lib
#pragma comment (lib, "Ws2_32.lib")
#pragma comment (lib, "Mswsock.lib")
#pragma comment (lib, "AdvApi32.lib")
#define DEFAULT_BUFLEN 65536
#define DEFAULT_PORT "27015"
int tcpnodelay(int sock) {
int yes=1;
return setsockopt(sock,IPPROTO_TCP,TCP_NODELAY,(char*)&yes,sizeof(int));
}
int __cdecl main(int argc, char **argv)
{
WSADATA wsaData;
SOCKET ConnectSocket = INVALID_SOCKET;
struct addrinfo *result = NULL,
*ptr = NULL,
hints;
char sendbuf[DEFAULT_BUFLEN];
char recvbuf[32];
unsigned long no;
unsigned long iResult;
unsigned long sent;
int recvbuflen = 32;
int recv_len, n;
unsigned long recv_no;
// Validate the parameters
if (argc != 2) {
printf("usage: %s server-name\n", argv[0]);
return 1;
}
// Initialize Winsock
iResult = WSAStartup(MAKEWORD(2,2), &wsaData);
if (iResult != 0) {
printf("WSAStartup failed with error: %d\n", iResult);
return 1;
}
ZeroMemory( &hints, sizeof(hints) );
hints.ai_family = AF_UNSPEC;
hints.ai_socktype = SOCK_STREAM;
hints.ai_protocol = IPPROTO_TCP;
// Resolve the server address and port
iResult = getaddrinfo(argv[1], DEFAULT_PORT, &hints, &result);
if ( iResult != 0 ) {
printf("getaddrinfo failed with error: %d\n", iResult);
WSACleanup();
return 1;
}
// Attempt to connect to an address until one succeeds
for(ptr=result; ptr != NULL ;ptr=ptr->ai_next) {
// Create a SOCKET for connecting to server
ConnectSocket = socket(ptr->ai_family, ptr->ai_socktype,
ptr->ai_protocol);
if (ConnectSocket == INVALID_SOCKET) {
printf("socket failed with error: %ld\n", WSAGetLastError());
WSACleanup();
return 1;
}
// Connect to server.
iResult = connect( ConnectSocket, ptr->ai_addr, (int)ptr->ai_addrlen);
if (iResult == SOCKET_ERROR) {
closesocket(ConnectSocket);
ConnectSocket = INVALID_SOCKET;
continue;
}
break;
}
freeaddrinfo(result);
if (ConnectSocket == INVALID_SOCKET) {
printf("Unable to connect to server!\n");
WSACleanup();
return 1;
}
if (tcpnodelay(ConnectSocket)<0) {
printf("Can't set TCP_NODELAY!\n");
}
recv_len = sizeof(no);
printf("recv_len: %d\n", recv_len);
// Send an initial buffer
memset(sendbuf, 0, DEFAULT_BUFLEN);
for (no=0; no<1024*1024; no++) {
sent = 0;
while (sent < DEFAULT_BUFLEN) {
iResult = send(ConnectSocket, sendbuf+sent, DEFAULT_BUFLEN-sent, 0);
if (iResult == SOCKET_ERROR) {
printf("send failed with error: %d\n", WSAGetLastError());
closesocket(ConnectSocket);
WSACleanup();
return 1;
}
sent += iResult;
}
n = recv(ConnectSocket, (char *)(&recv_no), recv_len, 0);
if (recv_len!=n || recv_no!=no) {
printf("recv len: %d, recv no %ld", n, recv_no);
exit(1);
}
}
printf("Bytes Sent: %ld\n", iResult);
// shutdown the connection since no more data will be sent
iResult = shutdown(ConnectSocket, SD_SEND);
if (iResult == SOCKET_ERROR) {
printf("shutdown failed with error: %d\n", WSAGetLastError());
closesocket(ConnectSocket);
WSACleanup();
return 1;
}
// cleanup
closesocket(ConnectSocket);
WSACleanup();
return 0;
}
サーバーとしてのLinuxのコード
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
int main( int argc, char *argv[] )
{
int sockfd, newsockfd, portno, clilen;
char buffer[65536];
unsigned int no;
unsigned long read_size;
struct sockaddr_in serv_addr, cli_addr;
int n;
int send_len;
/* First call to socket() function */
sockfd = socket(AF_INET, SOCK_STREAM, 0);
if (sockfd < 0)
{
perror("ERROR opening socket");
exit(1);
}
/* Initialize socket structure */
bzero((char *) &serv_addr, sizeof(serv_addr));
portno = 27015;
serv_addr.sin_family = AF_INET;
serv_addr.sin_addr.s_addr = INADDR_ANY;
serv_addr.sin_port = htons(portno);
/* Now bind the host address using bind() call.*/
if (bind(sockfd, (struct sockaddr *) &serv_addr,
sizeof(serv_addr)) < 0)
{
perror("ERROR on binding");
exit(1);
}
/* Now start listening for the clients, here process will
* go in sleep mode and will wait for the incoming connection
*/
listen(sockfd,5);
clilen = sizeof(cli_addr);
/* Accept actual connection from the client */
newsockfd = accept(sockfd, (struct sockaddr *)&cli_addr,
&clilen);
if (newsockfd < 0)
{
perror("ERROR on accept");
exit(1);
}
send_len = sizeof(no);
printf("send_len: %d\n", send_len);
/* If connection is established then start communicating */
bzero(buffer,65536);
for (no=0; no<1024*1024; no++) {
read_size = 0;
while (read_size < 65536) {
n = read( newsockfd,buffer+read_size,65536-read_size );
if (n < 0)
{
perror("ERROR reading from socket");
exit(1);
}
read_size += n;
}
n = write(newsockfd, &no, send_len);
if (n < send_len) {
printf("send len: %d\n", n);
exit(1);
}
}
printf("the message size: %d\n", n);
/* Write a response to the client */
n = write(newsockfd,"I got your message",18);
if (n < 0)
{
perror("ERROR writing to socket");
exit(1);
}
close(newsockfd);
return 0;
}