网络服务器-Loopback (Internet Sockets) VS UNIX Domain Sockets

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在本机的进程间通信中,TCP和UNIX域套接字是两种比较简单方便的通信方式,TCP基本以回路地址形式表现,回路地址在本机通信上还是要比UNIX域套接字多了封包/解包/校验和/序列确认等操作

那么对于这两种方式的性能比较可以参考以下文章:

http://bhavin.directi.com/unix-domain-sockets-vs-tcp-sockets/ 
http://lists.freebsd.org/pipermail/freebsd-performance/2005-February/001143.html

同时做了一个简单的对比测试,虚拟机上(1CPU、256M内存),单进程server、client,10w次5字节echo server结果(进行多次,差不多平均结果,系统其它参数未观察):

回路地址:real    0m5.879suser    0m0.012ssys     0m2.763s UNIX域套接字:real    0m11.433suser    0m0.019ssys     0m4.641s


其实网络协议处理主要消耗CPU资源,但相对来说资源消耗还是比较低的,不过对于要求非常高的短连接网络并发处理,TIME_WAIT对于回路地址是个问题,这点UNIX域套接字非常有优势。

以下为测试代码:

1. unix域套接字server

#include <stdio.h>#include <string.h>#include <unistd.h>#include <errno.h>#include <sys/socket.h>#include <sys/un.h>#undef  offsetof#define offsetof(TYPE, MEMBER) ((size_t) &((TYPE *)0)->MEMBER)int main(int argc, char *argv[]){    int sock = 0;    int conn = 0;    socklen_t addrlen = 0;    struct sockaddr_un addr;    char buf[64] = {0};    unlink("foo.socket");    if ((sock = socket(AF_UNIX, SOCK_STREAM, 0)) < 0) {        printf("socket failed\n");        return -1;    }    addr.sun_family = AF_UNIX;    strcpy(addr.sun_path, "foo.socket");    addrlen = offsetof(struct sockaddr_un, sun_path) + strlen(addr.sun_path);    if (bind(sock, (struct sockaddr *)&addr, addrlen) < 0) {        printf("bind failed\n");        return -1;    }    printf("UNIX domain socket bound\n");    if (listen(sock, 128) < 0) {        printf("listen failed\n");        return -1;    }    while (1) {        if ((conn = accept(sock, (struct sockaddr *)NULL, NULL)) < 0) {            printf("accept connect failed\n");            continue;        }        if (readn(conn, buf, 5) < 0) {            printf("read msg failed\n");            return -1;        }        buf[5] = '\0';        //printf("readn: %s\n", buf);        if (write(conn, buf, strlen(buf)) < 0) {            printf("write msg failed\n");            return -1;        }        close(conn);    }    close(sock);    return 0;}


2. unix域套接字client

#include <stdio.h>#include <string.h>#include <unistd.h>#include <errno.h>#include <sys/socket.h>#include <sys/un.h>#undef  offsetof#define offsetof(TYPE, MEMBER) ((size_t) &((TYPE *)0)->MEMBER)int main(int argc, char *argv[]){    int i = 0;    int sock = 0;    socklen_t addrlen;    struct sockaddr_un addr;    char buf[64] = {0};    while (i++ < 100000) {        if ((sock = socket(AF_UNIX, SOCK_STREAM, 0)) < 0) {            printf("socket failed\n");            return -1;        }        addr.sun_family = AF_UNIX;        strcpy(addr.sun_path, "foo.socket");        addrlen = offsetof(struct sockaddr_un, sun_path) + strlen(addr.sun_path);        if (connect(sock, (struct sockaddr *)&addr, addrlen) < 0) {            printf("connet failed\n");            return -1;        }        if (write(sock, "helo\n", 5) < 0) {            printf("write msg failed\n");            return -1;        }        if (readn(sock, buf, 5) < 0) {            printf("read msg failed\n");            return -1;        }        buf[5] = '\0';        //printf("readn: %s", buf);        close(sock);    }    return 0;}


3. socket套接字server

#include <stdio.h>#include <string.h>#include <unistd.h>#include <errno.h>#include <sys/types.h>#include <sys/socket.h>#include <netinet/in.h>int main(int argc, char** argv){    int on = 1;    int sock = 0;    int conn = 0;    struct sockaddr_in addr;    char buf[64];    if ((sock = socket(AF_INET, SOCK_STREAM, 0)) < 0) {        printf("socket failed\n");        return -1;    }    setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));    memset(&addr, 0, sizeof(addr));    addr.sin_family = AF_INET;    addr.sin_addr.s_addr = htonl(INADDR_ANY);    addr.sin_port = htons(6666);    if (bind(sock, (struct sockaddr*)&addr, sizeof(addr)) < 0) {        printf("bind failed\n");        return -1;    }    if (listen(sock, 128) < 0) {        printf("listen failed\n");        return -1;    }    while (1) {        if ((conn = accept(sock, (struct sockaddr *)NULL, NULL)) < 0) {            printf("accept connect failed\n");            continue;        }        if (readn(conn, buf, 5) < 0) {            printf("read msg failed\n");            return -1;        }        buf[5] = '\0';        //printf("readn: %s", buf);        if (write(conn, buf, strlen(buf)) < 0) {            printf("write msg failed\n");            return -1;        }        close(conn);    }    close(sock);    return 0;}


4. socket套接字client

#include <stdio.h>#include <string.h>#include <unistd.h>#include <errno.h>#include <sys/types.h>#include <sys/socket.h>#include <netinet/in.h>#include <arpa/inet.h>int main(int argc, char *argv[]){    int i = 0;    int sock = 0;    struct sockaddr_in addr;    char buf[64] = {0};    while (i++ < 100000) {        if ((sock = socket(AF_INET, SOCK_STREAM, 0)) < 0) {            printf("socket failed\n");            return -1;        }        memset(&addr, 0, sizeof(addr));        addr.sin_family = AF_INET;        addr.sin_port = htons(6666);        addr.sin_addr.s_addr = inet_addr("127.0.0.1");        if (connect(sock, (struct sockaddr *)&addr, sizeof(addr)) < 0) {            printf("connect failed\n");            return -1;        }        if (write(sock, "helo\n", 5) < 0) {            printf("write msg failed\n");            return -1;        }        if (readn(sock, buf, 5) < 0) {            printf("read msg failed\n");            return -1;        }        buf[5] = '\0';        //printf("reand: %s", buf);        close(sock);    }    return 0;}


5. 读数据共用函数

int readn(int fd, char *buf, int buflen){    int nleft = 0;    int nread = 0;    char *ptr = NULL;    ptr = buf;    nleft = buflen;    while (nleft > 0) {        if ((nread = read(fd, ptr, nleft)) < 0) {            if (EINTR == errno) {                nread = 0;            }            else {                return -1;            }        }        else if (0 == nread) {            break;        }        nleft -= nread;        ptr += nread;    }    return buflen - nleft;}


 

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