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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