京东网站建设费用,wordpress主题访问慢,大同网络公司,关键词是指什么从别的博主那copy过来#xff1a; 1 io_uring是Linux内核的一个新型I/O事件通知机制#xff0c;具有以下特点#xff1a; 高性能#xff1a;相比传统的select/poll/epoll等I/O多路复用机制#xff0c;io_uring采用了更高效的ring buffer实现方式#xff0c;可以在处理大量…从别的博主那copy过来 1 io_uring是Linux内核的一个新型I/O事件通知机制具有以下特点 高性能相比传统的select/poll/epoll等I/O多路复用机制io_uring采用了更高效的ring buffer实现方式可以在处理大量并发I/O请求时提供更高的吞吐量和低延迟。 异步io_uring支持异步I/O操作并且可以通过用户空间和内核空间之间的共享内存映射来避免数据拷贝从而减少了CPU的开销。 事件批处理io_uring可以将多个I/O操作合并成一个请求进行处理从而降低了系统调用的次数和上下文切换的开销。 灵活性io_uring提供了非常灵活的接口和配置选项可以根据应用程序的需要进行优化和调整。同时它还支持多线程操作和信号驱动I/O等功能。 2 安装 确认系统内核是5.10以后的版本还需安装liburing(依赖于内核的三个新的系统调用 io_uring_setup io_uring_register io_uring_enter 安装liburing库它对内核三个新的系统进行了封装 git clone https://github.com/axboe/liburing.git cd liburing/ ./configure make make install 由于github上不去 找了一个国内的源 git clone https://gitee.com/anolis/liburing.git make install 可以看到 将 liburing.h 和静态库 动态库copy到了 系统目录 写一个测试程序 #include stdio.h
#include string.h
#include unistd.h#include sys/socket.h
#include netinet/in.h
#include errno.h#include liburing.h#define ENTRIES_LENGTH 1024enum {EVENT_ACCEPT 0,EVENT_READ,EVENT_WRITE
};typedef struct _conninfo {int connfd;int event;
} conninfo;// sizeof(conninfo) 8// 0, 1, 2
// 3, 4, 5void set_send_event(struct io_uring *ring, int sockfd, void *buf, size_t len, int flags) {struct io_uring_sqe *sqe io_uring_get_sqe(ring);io_uring_prep_send(sqe, sockfd, buf, len, flags);conninfo info_send {.connfd sockfd,.event EVENT_WRITE,};memcpy(sqe-user_data, info_send, sizeof(info_send));}void set_recv_event(struct io_uring *ring, int sockfd, void *buf, size_t len, int flags) {struct io_uring_sqe *sqe io_uring_get_sqe(ring);io_uring_prep_recv(sqe, sockfd, buf, len, flags);conninfo info_recv {.connfd sockfd,.event EVENT_READ,};memcpy(sqe-user_data, info_recv, sizeof(info_recv));}void set_accept_event(struct io_uring *ring, int sockfd, struct sockaddr *addr,socklen_t *addrlen, int flags) {struct io_uring_sqe *sqe io_uring_get_sqe(ring);io_uring_prep_accept(sqe, sockfd, addr, addrlen, flags);conninfo info_accept {.connfd sockfd,.event EVENT_ACCEPT,};memcpy(sqe-user_data, info_accept, sizeof(info_accept));}int main() {int sockfd socket(AF_INET, SOCK_STREAM, 0); // iostruct sockaddr_in servaddr;memset(servaddr, 0, sizeof(struct sockaddr_in)); // 192.168.2.123servaddr.sin_family AF_INET;servaddr.sin_addr.s_addr htonl(INADDR_ANY); // 0.0.0.0servaddr.sin_port htons(9999);if (-1 bind(sockfd, (struct sockaddr*)servaddr, sizeof(struct sockaddr))) {printf(bind failed: %s, strerror(errno));return -1;}listen(sockfd, 10);
//liburingstruct io_uring_params params;memset(params, 0, sizeof(params));struct io_uring ring;io_uring_queue_init_params(ENTRIES_LENGTH, ring, params);struct io_uring_sqe *sqe io_uring_get_sqe(ring);struct sockaddr_in clientaddr;socklen_t clilen sizeof(struct sockaddr);set_accept_event(ring, sockfd, (struct sockaddr*)clientaddr, clilen, 0);char buffer[1024] {0};while (1) {io_uring_submit(ring);struct io_uring_cqe *cqe;io_uring_wait_cqe(ring, cqe);struct io_uring_cqe *cqes[10];int cqecount io_uring_peek_batch_cqe(ring, cqes, 10);//printf(cqecount -- %d\n, cqecount);int i 0;for (i 0;i cqecount;i ) {cqe cqes[i];conninfo ci;memcpy(ci, cqe-user_data, sizeof(ci));if (ci.event EVENT_ACCEPT) { // recv/sendif (cqe-res 0) continue;int connfd cqe-res;//printf(accept -- %d\n, connfd);set_accept_event(ring, ci.connfd, (struct sockaddr*)clientaddr, clilen, 0);set_recv_event(ring, connfd, buffer, 1024, 0);} else if (ci.event EVENT_READ) {if (cqe-res 0) continue;if (cqe-res 0) {close(ci.connfd);} else {printf(recv -- %s, %d\n, buffer, cqe-res);//set_recv_event(ring, ci.connfd, buffer, 1024, 0);set_send_event(ring, ci.connfd, buffer, cqe-res, 0);}} else if (ci.event EVENT_WRITE) { ////printf(write complete\n);set_recv_event(ring, ci.connfd, buffer, 1024, 0);} }io_uring_cq_advance(ring, cqecount);}getchar();}编译程序
gcc -o ioring ioring.cpp -luring -static之后程序起来之后 用网络调试助手 发送测试文字 先做个记录
