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(The following comes from the web and its own summary, thanks again for the insights provided by the great gods on the Web)Before exploring Select poll Epoll We first need to know what is called multiplexing:Come down and explore why multiplexing is used:first, let's look at the complete process of a client request server. First, the request comes in to establish a connection, then receive the data, receive the data, and then send the data.Specific to

operation and does not need to wait, but immediately gets a result. When the user process determines that the result is an error, it knows that the data is not ready, so it can send the read operation again. Once the data in the kernel is ready and again receives the system call of the user process, it immediately copies the data to the user's memory and then returns. Therefore, nonblocking IO is characterized by the user process needs to constantly proactively ask kernel data well no. I/O mult

From: http://www.cnblogs.com/aga-j/archive/2011/08/26/2153943.html Introduction to select, poll, and epoll Select In essence, select performs the next step by setting or checking the data structure that stores the FD flag. The disadvantage is:1. The number of FD monitored by a single process is limited.2. Maintain a Data Structure to store a large amount of fd data, which will cause high replication overhead when the user space and kernel

pointer.int poll (struct POLLFD * fds,nfds_t nfds,int Timeout)struct POLLFD{int FD;Short events;Short revents;};The POLLFD structure contains the event to be monitored and the event that occurred, no longer using the Select "parameter-value" delivery method. WhilePOLLFD does not have a maximum number of limits (but the performance is also degraded when the number is too large). As with the Select function, the poll returnsBack, you need to poll the POLLFD to get the ready descriptor.From the ab

In Linux network programming, it is a long time to use Select to do event triggering. In the new Linux kernel, there is a mechanism to replace it, which is epoll. The biggest advantage over Select,epoll is that it does not reduce efficiency as the number of listening FD increases. Because in the select implementation in the kernel, it is handled by polling, the more the number of polled FD, the more natural

Document directory PPC TPC Select Poll Epoll Epoll Introduction Epoll is introduced in the linux 2.6 kernel. It replaces the previous select/poll model and can fully support large-scale concurrent network programs in linux.Comparison between Epoll and other concurrent network programs in linux PPC A typical Ap

In Linux network programming, select is used for event triggering for a long time. In the new Linux kernel, there is a mechanism to replace it, that is, epoll. Compared with select, epoll does not reduce the efficiency as the number of FD listeners increases. In the select implementation in the kernel, it uses polling for processing. The larger the number of FD polling, the more time it takes. In addition,

What isEpollWhat is Epoll? According to the man manual, it is an improved poll for handling large batches of handles . Of course, this is not the 2.6 kernel, it is introduced in the 2.5.44 kernel (Epoll (4) is a new API introduced in Linux kernel 2.5.44), it has almost all the advantages of the previous said, A multi-channel I/O readiness notification method that is considered to be the best performance und

Best references: 1. Master from the Internet. 2. MAN 7 epoll 3. http://bbs.chinaunix.net/thread-1740209-1-1.html 4. http://hi.baidu.com/firobd/blog/item/dcb4f251530d341d0cf3e3ee.html 5. http://www.cnblogs.com/dubingsky/archive/2009/07/22/1528695.html 6. http://bbs.chinaunix.net/thread-1740209-2-1.html 7. http://www.cppblog.com/converse/archive/2008/04/29/48482.html Article 1: Overview In short, epoll is an

1. Where is epoll sacred? Epoll is currently a hot candidate for developing large-scale concurrent network programs in Linux. epoll is officially introduced in the linux2.6 kernel, similar to select, in fact bothI/O Multiplexing TechnologyAnd there is nothing mysterious. In fact, there is always no way to design concurrent network programs in Linux, such as the t

NIO of JDK 6.0 and JDK 5.0 Update 9 supports epoll (Linux only). This greatly improves the performance of concurrent idle connections, which is required by many network server applications. The method for enabling is as follows: -Djava.nio.channels.spi.SelectorProvider=sun.nio.ch.EPollSelectorProvider For example, if Tomcat running in Linux uses NiO connector, enabling epoll will help improve performance

http://blog.csdn.net/simba888888/article/details/9075719 Introduction of Epoll Series functions #include int epoll_create (int size);int epoll_create1 (int flags);int epoll_ctl (int epfd, int op, int fd, struct epoll_event *event);int epoll_wait (int epfd, struct epoll_event *events, int maxevents, int timeout); * Epoll_create (2) creates a Epoll instance and returns a file descriptor referring to that i

immediately gets a result. When the user process determines that the result is an error, it knows that the data is not ready, so it can send the read operation again. Once the data in the kernel is ready and again receives the system call of the user process, it immediately copies the data to the user's memory and then returns. Therefore, nonblocking IO is characterized by the user process needs to constantly proactively ask kernel data well no. I/O multiplexing (IO multiplexing) IO multiplexin

©min technology sharing –54min.com (RSS feed) | Original link: http://54min.com/post/using-epoll-method-create-non-blocking-socket.html Epoll method to implement non-blocking socket event-based method and Epoll Epoll is the Event-based method for implementing asynchronous Io/non-blocking IO. After the Linux kernel 2.

for the event notification. /Dev/epoll The device named/dev/epoll appears in linux2.4 as a patch. It provides functions similar to/dev/poll and uses MMAP to improve performance. Kqueue FreeBSD implements kqueue and supports horizontal and edge triggering. The performance is very similar to epoll mentioned below. Epoll