本文主要是介绍AF_UNIX和127.0.0.1(AF_INET)回环地址写数据速度对比(二)，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！
之前写了篇博客：AF_UNIX和127.0.0.1(AF_INET)回环地址写数据速度对比
然后利用的是发送端读取大文件，接收方接收并保存为文件的方式进行测试，结果发现，AF_UNIX并未比127.0.0.1(AF_INET)回环地址优秀，若单次发送的字节数少时，回环地址反而更快。
由于测试时发送的是1.15G大小的文件，比较快就发送结束了，而且读文件，写文件是个比较费时的操作，本人考虑到读写文件费时的影响，决定发送端自己构造字符串，接收方只统计接收到的字符个数，并不写文件。然后发送端发送100秒，对比下100秒之内，AF_UNIX和回还地址接收到的字节个数。
AF_UNIX服务端代码(unixsocketserver2.c)
#include <stdlib.h>
#include <stdio.h>
#include <stddef.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <errno.h>
#include <string.h>
#include <unistd.h>
#include <ctype.h> #define MAXLINE 80 char *socket_path = "/tmp/server.socket"; #define RECV_LEN 1000000int main(void)
{ fd_set readmask, exceptmask;struct timeval tv;int maxfd = FD_SETSIZE;int nready = 0;char buf[RECV_LEN + 1];int readbyte, writebyte;struct sockaddr_un serun, cliun; socklen_t cliun_len; int listenfd, connfd, size; if ((listenfd = socket(AF_UNIX, SOCK_STREAM, 0)) < 0) { perror("socket error"); exit(1); } long long allrecvbyte = 0;memset(&serun, 0, sizeof(serun)); serun.sun_family = AF_UNIX; strcpy(serun.sun_path, socket_path); size = offsetof(struct sockaddr_un, sun_path) + strlen(serun.sun_path); unlink(socket_path); if (bind(listenfd, (struct sockaddr *)&serun, size) < 0) { perror("bind error"); exit(1); } printf("UNIX domain socket bound\n"); if (listen(listenfd, 20) < 0) { perror("listen error"); exit(1); } printf("Accepting connections ...\n"); cliun_len = sizeof(cliun); if ((connfd = accept(listenfd, (struct sockaddr *)&cliun, &cliun_len)) < 0){ perror("accept error"); goto end; }time_t now, endtime;now = time(NULL);while(1){FD_ZERO(&readmask);FD_ZERO(&exceptmask);FD_SET(connfd, &readmask);FD_SET(connfd, &exceptmask);tv.tv_sec = 3;tv.tv_usec = 0;nready = select(maxfd, &readmask, NULL, &exceptmask, &tv);if(nready < 0){goto end;}if(nready == 0){printf("nready == 0\n");continue;}if(FD_ISSET(connfd, &readmask)){readbyte = recv(connfd, buf, RECV_LEN, 0);if(readbyte < 0){perror("readbyte < 0");goto end;}if(readbyte == 0){perror("readbyte == 0");goto end;}if(readbyte > 0){allrecvbyte += readbyte;}}if(FD_ISSET(connfd, &exceptmask)){printf("select, exceptmask\n");goto end;}}
end:endtime = time(NULL);printf("costs %d seconds, allrecvbyte is %lld\n", endtime - now, allrecvbyte);close(connfd);close(listenfd); return 0;
}AF_UNIX客户端代码(unixsocketclient2.c)
#include <stdlib.h>
#include <stdio.h>
#include <stddef.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <errno.h>
#include <string.h>
#include <unistd.h> #define SEND_LEN 1000000char *client_path = "/tmp/client.socket";
char *server_path = "/tmp/server.socket"; int main() { struct sockaddr_un cliun, serun; int len; int sockfd, n; int i = 0;if ((sockfd = socket(AF_UNIX, SOCK_STREAM, 0)) < 0){ perror("client socket error"); exit(1); } // 一般显式调用bind函数，以便服务器区分不同客户端 memset(&cliun, 0, sizeof(cliun)); cliun.sun_family = AF_UNIX; strcpy(cliun.sun_path, client_path); len = offsetof(struct sockaddr_un, sun_path) + strlen(cliun.sun_path); unlink(cliun.sun_path); if (bind(sockfd, (struct sockaddr *)&cliun, len) < 0) { perror("bind error"); exit(1); } memset(&serun, 0, sizeof(serun)); serun.sun_family = AF_UNIX; strcpy(serun.sun_path, server_path); len = offsetof(struct sockaddr_un, sun_path) + strlen(serun.sun_path); if (connect(sockfd, (struct sockaddr *)&serun, len) < 0){ perror("connect error"); exit(1); } int sendbyte = 0;int alreadysendbyte = 0;long long allsendbyte = 0;char buf[SEND_LEN + 1];time_t begin = time(NULL);time_t now = time(NULL);int continueSeconds = 0;while(continueSeconds < 100){alreadysendbyte = 0;for(i = 0; i < SEND_LEN; i++){buf[i] = i + 1;}n = SEND_LEN;sendbyte = send(sockfd, buf, n, 0);if(sendbyte == -1){perror("send error");goto end;}alreadysendbyte += sendbyte;while(alreadysendbyte < n){sendbyte = send(sockfd, buf + alreadysendbyte, n - alreadysendbyte, 0);if(sendbyte == -1){perror("send error");goto end;}alreadysendbyte += sendbyte;}allsendbyte += n;now = time(NULL);continueSeconds = now - begin;}
end:printf("allsendbyte is %lld\n", allsendbyte);close(sockfd);return 0;
}回环地址服务端代码(loopaddrserver2.c)
#include <sys/socket.h>
#include <arpa/inet.h>
#include <string.h>
#include <stdio.h>
#include <stdlib.h>#define RECV_LEN 1000000int main(){fd_set readmask, exceptmask;struct timeval tv;int maxfd = FD_SETSIZE;int nready = 0;char buf[RECV_LEN + 1];int readbyte, writebyte;int serv_sock=socket(AF_INET,SOCK_STREAM,0);long long allrecvbyte = 0;struct sockaddr_in serv_addr;memset(&serv_addr,0,sizeof(serv_addr));serv_addr.sin_family=AF_INET;serv_addr.sin_addr.s_addr=htonl(INADDR_ANY);serv_addr.sin_port=htons(9990);bind(serv_sock,(struct sockaddr*)&serv_addr,sizeof(serv_addr));listen(serv_sock,5);struct sockaddr_in clnt_addr;socklen_t clnt_addr_size=sizeof(clnt_addr);int clnt_sock=accept(serv_sock,(struct sockaddr*)&clnt_addr,&clnt_addr_size);time_t now, endtime;now = time(NULL);while(1){FD_ZERO(&readmask);FD_ZERO(&exceptmask);FD_SET(clnt_sock, &readmask);FD_SET(clnt_sock, &exceptmask);tv.tv_sec = 3;tv.tv_usec = 0;nready = select(maxfd, &readmask, NULL, &exceptmask, &tv);if(nready < 0){goto end;}if(nready == 0){printf("nready == 0\n");continue;}if(FD_ISSET(clnt_sock, &readmask)){readbyte = recv(clnt_sock, buf, RECV_LEN, 0);if(readbyte < 0){perror("readbyte < 0");goto end;}if(readbyte == 0){perror("readbyte == 0");goto end;}if(readbyte > 0){allrecvbyte += readbyte;}}if(FD_ISSET(clnt_sock, &exceptmask)){printf("select, exceptmask\n");goto end;}}
end: endtime = time(NULL);printf("costs %d seconds, allrecvbyte is %lld\n", endtime - now, allrecvbyte);close(clnt_sock);close(serv_sock);return 0;
}回环地址客户端代码(loopaddrclient2.c)
#include<sys/socket.h>
#include<arpa/inet.h>
#include<stdio.h>
#include<string.h>
#include <errno.h>
#include <stdlib.h>#define SEND_LEN 1000000int main(){int sock=socket(AF_INET,SOCK_STREAM,0); int n = 0;int i = 0;struct sockaddr_in serv_addr;memset(&serv_addr,0,sizeof(serv_addr));serv_addr.sin_family=AF_INET;serv_addr.sin_addr.s_addr=inet_addr("127.0.0.1");serv_addr.sin_port=htons(9990);if(connect(sock,(struct sockaddr*)&serv_addr,sizeof(serv_addr)) < 0){perror("connect failed");goto end;}int sendbyte = 0;int alreadysendbyte = 0;long long allsendbyte = 0;char buf[SEND_LEN + 1];time_t begin = time(NULL);time_t now = time(NULL);int continueSeconds = 0;while(continueSeconds < 100){alreadysendbyte = 0;for(i = 0; i < SEND_LEN; i++){buf[i] = i + 1;}n = SEND_LEN;sendbyte = send(sock, buf, n, 0);if(sendbyte == -1){perror("send error");goto end;}alreadysendbyte += sendbyte;while(alreadysendbyte < n){sendbyte = send(sock, buf + alreadysendbyte, n - alreadysendbyte, 0);if(sendbyte == -1){perror("send error");goto end;}alreadysendbyte += sendbyte;}allsendbyte += n;now = time(NULL);continueSeconds = now - begin;}
end:printf("allsendbyte is %lld\n", allsendbyte);close(sock);return 0;
}测试结果：
单次send字节数为10000时，AF_UNIX接收字节数为30240650000，127.0.0.1(AF_INET)接收字节数为36394910000。
单次send字节数为100000时，AF_UNIX接收字节数为40230300000，127.0.0.1(AF_INET)接收字节数为38364400000。
单次send字节数为1000000时，AF_UNIX接收字节数为41368000000，127.0.0.1(AF_INET)接收字节数为42221000000。
可见，AF_UNIX比回环地址并无明显优势
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