什么是百万并发？
指的是服务器接收百万个连接或数据会在同一时刻接收到，也就是同时能看到
百万个连接或数据。
在了解服务器百万并发的同时，我们先来看看我们的百万并发服务器的结构图。
主体是以reactor为核心，链表方式存储事件以及事件对应的属性
服务端
#include <stdio.h> #include <stdlib.h> #include <string.h> #include <sys/socket.h> #include <sys/epoll.h> #include <arpa/inet.h> #include <sys/types.h> #include <sys/stat.h> #include <fcntl.h> #include <unistd.h> #include <errno.h> #include <sys/time.h> #include <sys/sendfile.h> #define BUFFER_LENGTH 1024 #define MAX_EPOLL_EVENTS 1024 #define RESOURCE_LENGTH 1024 #define SERVER_PORT 8888 #define PORT_COUNT 1 typedef int NCALLBACK(int ,int, void*); #define HTTP_METHOD_GET 0 #define HTTP_METHOD_POST 1 struct ntyevent { int fd; int events; void *arg; int (*callback)(int fd, int events, void *arg); int status; char buffer[BUFFER_LENGTH]; char wbuffer[BUFFER_LENGTH]; int length; int wlength; //long last_active; // http reqeust int method; char resource[RESOURCE_LENGTH]; }; struct eventblock { struct eventblock *next; struct ntyevent *events; }; struct ntyreactor { int epfd; int blkcnt; struct eventblock *evblks; }; int recv_cb(int fd, int events, void *arg); int send_cb(int fd, int events, void *arg); struct ntyevent *ntyreactor_idx(struct ntyreactor *reactor, int sockfd); void nty_event_set(struct ntyevent *ev, int fd, NCALLBACK callback, void *arg) { ev->fd = fd; ev->callback = callback; ev->events = 0; ev->arg = arg; //ev->last_active = time(NULL); return ; } int nty_event_add(int epfd, int events, struct ntyevent *ev) { struct epoll_event ep_ev = {0, {0}}; ep_ev.data.ptr = ev; ep_ev.events = ev->events = events; int op; if (ev->status == 1) { op = EPOLL_CTL_MOD; } else { op = EPOLL_CTL_ADD; ev->status = 1; } if (epoll_ctl(epfd, op, ev->fd, &ep_ev) < 0) { printf("event add failed [fd=%d], events[%d]\n", ev->fd, events); return -1; } return 0; } int nty_event_del(int epfd, struct ntyevent *ev) { struct epoll_event ep_ev = {0, {0}}; if (ev->status != 1) { return -1; } ep_ev.data.ptr = ev; ev->status = 0; epoll_ctl(epfd, EPOLL_CTL_DEL, ev->fd, &ep_ev); return 0; } // request // location /0voice/king/index.html HTTP/1.1 // int readline(char* allbuf,int idx,char* linebuf) { int len = strlen(allbuf); for (;idx < len; ++idx) { if(allbuf[idx]=='\r' && allbuf[idx+1]=='\n') return idx+2; else *(linebuf++) = allbuf[idx]; } return -1; } int nty_http_request(struct ntyevent *ev) { char linebuffer[1024] = {0}; int idx = readline(ev->buffer, 0, linebuffer); if (strstr(linebuffer, "GET")) { ev->method = HTTP_METHOD_GET; // int i = 0; while(linebuffer[sizeof("GET ") + i] != ' ') i ++; linebuffer[sizeof("GET ") + i] = '\0'; sprintf(ev->resource, "%s/%s", HTTP_WEB_ROOT, linebuffer+sizeof("GET ")); //printf("resource: %s\n", ev->resource); // } else if (strstr(linebuffer, "POST")) { ev->method = HTTP_METHOD_POST; } } int nty_http_response_get_method(struct ntyevent *ev) { //int filed = open() #if 0 int len = sprintf(ev->wbuffer, "HTTP/1.1 200 OK\r\n" "Accept-Ranges: bytes\r\n" "Content-Length: 78\r\n" "Content-Type: text/html\r\n" "Date: Sat, 06 Aug 2022 13:16:46 GMT\r\n\r\n" "<html><head><title>0voice.king</title></head><body><h1>King</h1><body/></html>"); ev->wlength = len; #else int len; int filefd = open(ev->resource, O_RDONLY); if (filefd == -1) { len = sprintf(ev->wbuffer, "HTTP/1.1 200 OK\r\n" "Accept-Ranges: bytes\r\n" "Content-Length: 78\r\n" "Content-Type: text/html\r\n" "Date: Sat, 06 Aug 2022 13:16:46 GMT\r\n\r\n" "<html><head><title>0voice.king</title></head><body><h1>King</h1><body/></html>"); ev->wlength = len; } else { struct stat stat_buf; fstat(filefd, &stat_buf); close(filefd); #if 1 len = sprintf(ev->wbuffer, "HTTP/1.1 200 OK\r\n" "Accept-Ranges: bytes\r\n" "Content-Length: %ld\r\n" "Content-Type: text/html\r\n" "Date: Sat, 06 Aug 2022 13:16:46 GMT\r\n\r\n", stat_buf.st_size); #else len = sprintf(ev->wbuffer, "HTTP/1.1 200 OK\r\n" "Accept-Ranges: bytes\r\n" "Content-Length: %ld\r\n" "Content-Type: image/png\r\n" "Date: Sat, 06 Aug 2022 13:16:46 GMT\r\n\r\n", stat_buf.st_size); #endif ev->wlength = len; } #endif return len; } int nty_http_response(struct ntyevent *ev) { // ev->method, ev->resouces if (ev->method == HTTP_METHOD_GET) { return nty_http_response_get_method(ev); } else if (ev->method == HTTP_METHOD_POST) { } } // connection // sock_item --> fd, rbuffer, wbuffer, clientaddr int recv_cb(int fd, int events, void *arg) { struct ntyreactor *reactor = (struct ntyreactor*)arg; struct ntyevent *ev = ntyreactor_idx(reactor, fd); if (ev == NULL) return -1; // int len = recv(fd, ev->buffer, BUFFER_LENGTH, 0); nty_event_del(reactor->epfd, ev); if (len > 0) { ev->length = len; ev->buffer[len] = '\0'; //printf("recv [%d]:%s\n", fd, ev->buffer); nty_http_request(ev); // parser http hdr nty_event_set(ev, fd, send_cb, reactor); nty_event_add(reactor->epfd, EPOLLOUT, ev); } else if (len == 0) { nty_event_del(reactor->epfd, ev); //printf("recv_cb --> disconnect\n"); close(ev->fd); } else { if (errno == EAGAIN && errno == EWOULDBLOCK) { // } else if (errno == ECONNRESET){ nty_event_del(reactor->epfd, ev); close(ev->fd); } //printf("recv[fd=%d] error[%d]:%s\n", fd, errno, strerror(errno)); } return len; } int send_cb(int fd, int events, void *arg) { struct ntyreactor *reactor = (struct ntyreactor*)arg; struct ntyevent *ev = ntyreactor_idx(reactor, fd); if (ev == NULL) return -1; nty_http_response(ev); //encode int len = send(fd, ev->wbuffer, ev->wlength, 0); if (len > 0) { //printf("resource: %s\n", ev->resource); int filefd = open(ev->resource, O_RDONLY); //if (filefd < 0) return -1; struct stat stat_buf; fstat(filefd, &stat_buf); int flag = fcntl(fd, F_GETFL, 0); flag &= ~O_NONBLOCK; fcntl(fd, F_SETFL, flag); int ret = sendfile(fd, filefd, NULL, stat_buf.st_size); if (ret == -1) { printf("sendfile: errno: %d\n", errno); } flag |= O_NONBLOCK; fcntl(fd, F_SETFL, flag); close(filefd); send(fd, "\r\n", 2, 0); nty_event_del(reactor->epfd, ev); nty_event_set(ev, fd, recv_cb, reactor); nty_event_add(reactor->epfd, EPOLLIN, ev); } else { nty_event_del(reactor->epfd, ev); close(ev->fd); //printf("send[fd=%d] error %s\n", fd, strerror(errno)); } return len; } int curfds = 0; #define TIME_SUB_MS(tv1, tv2) ((tv1.tv_sec - tv2.tv_sec) * 1000 + (tv1.tv_usec - tv2.tv_usec) / 1000) struct timeval tv_begin; int accept_cb(int fd, int events, void *arg) { struct ntyreactor *reactor = (struct ntyreactor*)arg; if (reactor == NULL) return -1; struct sockaddr_in client_addr; socklen_t len = sizeof(client_addr); int clientfd; if ((clientfd = accept(fd, (struct sockaddr*)&client_addr, &len)) == -1) { if (errno != EAGAIN && errno != EINTR) { } printf("accept: %s\n", strerror(errno)); return -1; } int flag = 0; if ((flag = fcntl(clientfd, F_SETFL, O_NONBLOCK)) < 0) { printf("%s: fcntl nonblocking failed, %d\n", __func__, MAX_EPOLL_EVENTS); return -1; } struct ntyevent *event = ntyreactor_idx(reactor, clientfd); if (event == NULL) return -1; nty_event_set(event, clientfd, recv_cb, reactor); nty_event_add(reactor->epfd, EPOLLIN, event); if (curfds++ % 1000 == 999) { struct timeval tv_cur; memcpy(&tv_cur, &tv_begin, sizeof(struct timeval)); gettimeofday(&tv_begin, NULL); int time_used = TIME_SUB_MS(tv_begin, tv_cur); printf("connections: %d, sockfd:%d, time_used:%d\n", curfds, clientfd, time_used); } //printf("new connect [%s:%d], pos[%d]\n", // inet_ntoa(client_addr.sin_addr), ntohs(client_addr.sin_port), clientfd); return 0; } int init_sock(short port) { int fd = socket(AF_INET, SOCK_STREAM, 0); fcntl(fd, F_SETFL, O_NONBLOCK); struct sockaddr_in server_addr; memset(&server_addr, 0, sizeof(server_addr)); server_addr.sin_family = AF_INET; server_addr.sin_addr.s_addr = htonl(INADDR_ANY); server_addr.sin_port = htons(port); if (bind(fd, (struct sockaddr*)&addr, sizeof(struct sockaddr_in)) < 0) { perror("bind"); return 2; } if (listen(fd, 20) < 0) { printf("listen failed : %s\n", strerror(errno)); return -1; } printf("listen server port : %d\n", port); gettimeofday(&tv_begin, NULL); return fd; } int ntyreactor_alloc(struct ntyreactor *reactor) { if (reactor == NULL) return -1; if (reactor->evblks == NULL) return -1; struct eventblock *blk = reactor->evblks; while (blk->next != NULL) { blk = blk->next; } struct ntyevent* evs = (struct ntyevent*)malloc((MAX_EPOLL_EVENTS) * sizeof(struct ntyevent)); if (evs == NULL) { printf("ntyreactor_alloc ntyevent failed\n"); return -2; } memset(evs, 0, (MAX_EPOLL_EVENTS) * sizeof(struct ntyevent)); struct eventblock *block = malloc(sizeof(struct eventblock)); if (block == NULL) { printf("ntyreactor_alloc eventblock failed\n"); return -3; } block->events = evs; block->next = NULL; blk->next = block; reactor->blkcnt ++; return 0; } struct ntyevent *ntyreactor_idx(struct ntyreactor *reactor, int sockfd) { if (reactor == NULL) return NULL; if (reactor->evblks == NULL) return NULL; int blkidx = sockfd / MAX_EPOLL_EVENTS; while (blkidx >= reactor->blkcnt) { ntyreactor_alloc(reactor); } int i = 0; struct eventblock *blk = reactor->evblks; while (i++ != blkidx && blk != NULL) { blk = blk->next; } return &blk->events[sockfd % MAX_EPOLL_EVENTS]; } int ntyreactor_init(struct ntyreactor *reactor) { if (reactor == NULL) return -1; memset(reactor, 0, sizeof(struct ntyreactor)); reactor->epfd = epoll_create(1); if (reactor->epfd <= 0) { printf("create epfd in %s err %s\n", __func__, strerror(errno)); return -2; } struct ntyevent* evs = (struct ntyevent*)malloc((MAX_EPOLL_EVENTS) * sizeof(struct ntyevent)); if (evs == NULL) { printf("create epfd in %s err %s\n", __func__, strerror(errno)); close(reactor->epfd); return -3; } memset(evs, 0, (MAX_EPOLL_EVENTS) * sizeof(struct ntyevent)); struct eventblock *block = malloc(sizeof(struct eventblock)); if (block == NULL) { free(evs); close(reactor->epfd); return -3; } block->events = evs; block->next = NULL; reactor->evblks = block; reactor->blkcnt = 1; return 0; } int ntyreactor_destory(struct ntyreactor *reactor) { close(reactor->epfd); struct eventblock *blk = reactor->evblks; struct eventblock *blk_next; while (blk != NULL) { blk_next = blk->next; free(blk->events); free(blk); blk = blk_next; } return 0; } int ntyreactor_addlistener(struct ntyreactor *reactor, int sockfd, NCALLBACK *acceptor) { if (reactor == NULL) return -1; if (reactor->evblks == NULL) return -1; struct ntyevent *event = ntyreactor_idx(reactor, sockfd); if (event == NULL) return -1; nty_event_set(event, sockfd, acceptor, reactor); nty_event_add(reactor->epfd, EPOLLIN, event); return 0; } int ntyreactor_run(struct ntyreactor *reactor) { if (reactor == NULL) return -1; if (reactor->epfd < 0) return -1; if (reactor->evblks == NULL) return -1; struct epoll_event events[MAX_EPOLL_EVENTS+1]; int checkpos = 0, i; while (1) { int nready = epoll_wait(reactor->epfd, events, MAX_EPOLL_EVENTS, 1000); if (nready < 0) { printf("epoll_wait error, exit\n"); continue; } for (i = 0;i < nready;i ++) { struct ntyevent *ev = (struct ntyevent*)events[i].data.ptr; if ((events[i].events & EPOLLIN) && (ev->events & EPOLLIN)) { ev->callback(ev->fd, events[i].events, ev->arg); } if ((events[i].events & EPOLLOUT) && (ev->events & EPOLLOUT)) { ev->callback(ev->fd, events[i].events, ev->arg); } } } } int main(int argc, char *argv[]) { struct ntyreactor *reactor = (struct ntyreactor*)malloc(sizeof(struct ntyreactor)); ntyreactor_init(reactor); unsigned short port = SERVER_PORT; if (argc == 2) { port = atoi(argv[1]); } int i = 0; int sockfds[PORT_COUNT] = {0}; for (i = 0;i < PORT_COUNT;i ++) { sockfds[i] = init_sock(port+i); ntyreactor_addlistener(reactor, sockfds[i], accept_cb); } ntyreactor_run(reactor); ntyreactor_destory(reactor); for (i = 0;i < PORT_COUNT;i ++) { close(sockfds[i]); } free(reactor); return 0; }
客户端(向服务器一直发请求)
#include <stdio.h> #include <string.h> #include <stdlib.h> #include <sys/types.h> #include <sys/socket.h> #include <sys/epoll.h> #include <errno.h> #include <netinet/tcp.h> #include <arpa/inet.h> #include <netdb.h> #include <fcntl.h> #define MAX_BUFFER 128 #define MAX_EPOLLSIZE (384*1024) #define MAX_PORT 100 #define TIME_SUB_MS(tv1, tv2) ((tv1.tv_sec - tv2.tv_sec) * 1000 + (tv1.tv_usec - tv2.tv_usec) / 1000) int isContinue = 0; static int ntySetNonblock(int fd) { int flags; flags = fcntl(fd, F_GETFL, 0); if (flags < 0) return flags; flags |= O_NONBLOCK; if (fcntl(fd, F_SETFL, flags) < 0) return -1; return 0; } static int ntySetReUseAddr(int fd) { int reuse = 1; return setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, (char *)&reuse, sizeof(reuse)); } int main(int argc, char **argv) { if (argc <= 2) { printf("Usage: %s ip port\n", argv[0]); exit(0); } const char *ip = argv[1]; int port = atoi(argv[2]); int connections = 0; char buffer[128] = {0}; int i = 0, index = 0; struct epoll_event events[MAX_EPOLLSIZE]; int epoll_fd = epoll_create(MAX_EPOLLSIZE); strcpy(buffer, " Data From MulClient\n"); struct sockaddr_in addr; memset(&addr, 0, sizeof(struct sockaddr_in)); addr.sin_family = AF_INET; addr.sin_addr.s_addr = inet_addr(ip); struct timeval tv_begin; gettimeofday(&tv_begin, NULL); while (1) { if (++index >= MAX_PORT) index = 0; struct epoll_event ev; int sockfd = 0; if (connections < 340000 && !isContinue) { sockfd = socket(AF_INET, SOCK_STREAM, 0); if (sockfd == -1) { perror("socket"); goto err; } //ntySetReUseAddr(sockfd); addr.sin_port = htons(port+index); if (connect(sockfd, (struct sockaddr*)&addr, sizeof(struct sockaddr_in)) < 0) { perror("connect"); goto err; } ntySetNonblock(sockfd); ntySetReUseAddr(sockfd); sprintf(buffer, "Hello Server: client --> %d\n", connections); send(sockfd, buffer, strlen(buffer), 0); ev.data.fd = sockfd; ev.events = EPOLLIN | EPOLLOUT; epoll_ctl(epoll_fd, EPOLL_CTL_ADD, sockfd, &ev); connections ++; } //connections ++; if (connections % 1000 == 999 || connections >= 340000) { struct timeval tv_cur; memcpy(&tv_cur, &tv_begin, sizeof(struct timeval)); gettimeofday(&tv_begin, NULL); int time_used = TIME_SUB_MS(tv_begin, tv_cur); printf("connections: %d, sockfd:%d, time_used:%d\n", connections, sockfd, time_used); int nfds = epoll_wait(epoll_fd, events, connections, 100); for (i = 0;i < nfds;i ++) { int clientfd = events[i].data.fd; if (events[i].events & EPOLLOUT) { sprintf(buffer, "data from %d\n", clientfd); send(sockfd, buffer, strlen(buffer), 0); } else if (events[i].events & EPOLLIN) { char rBuffer[MAX_BUFFER] = {0}; ssize_t length = recv(sockfd, rBuffer, MAX_BUFFER, 0); if (length > 0) { printf(" RecvBuffer:%s\n", rBuffer); if (!strcmp(rBuffer, "quit")) { isContinue = 0; } } else if (length == 0) { printf(" Disconnect clientfd:%d\n", clientfd); connections --; close(clientfd); } else { if (errno == EINTR) continue; printf(" Error clientfd:%d, errno:%d\n", clientfd, errno); close(clientfd); } } else { printf(" clientfd:%d, errno:%d\n", clientfd, errno); close(clientfd); } } } usleep(500); } return 0; err: printf("error : %s\n", strerror(errno)); return 0; }
实现效果跟服务器的性能和台数也有关系，我只有一台服务器并且内存很小只有1G，所以到不了百万并发，多几台服务器就可以实现百万并发了
还有一个细节就是在测试百万并发的时候，尽量减少IO操作提升百万并发效率
