m13 multiplexer

comes back. (Of course, the real world is not, but it is true in computers.) ）4 Non-blocking non-blocking state, if there is nothing to read, or not to write, read and write function immediately return, and do not wait, the bank in the withdrawal business, collect a small ticket, we can play mobile phone after the collection, or chat with others, when the wheel we, the bank's horn will be notified, this time we can go.Java support for bio, NIO, AIO:Java BIO: Synchronization and blocking, the se

been accumulated in the send queue to complete; The message that is being write or read needs to be processed; Set the scheduled task in the Nioeventloop thread scheduler, which needs to be performed or cleaned up. Let's look at the main operations and resource objects involved in Netty graceful exit:Netty 's graceful exit summed up three big steps: The state bit of the NIO thread is set to the St_shutting_down state, and no new messages are processed (the message is not a

IO operations to complete, and then notifies the application when the kernel completes the IO operation.Synchronous blocking IO (JAVA BIO):Synchronization and blocking, the server implementation mode for a connection to a thread, that is, the client has a connection request when the server needs to start a thread to process, if the connection does not do anything will cause unnecessary thread overhead, of course, can be improved through the thread pool mechanism.Synchronous non-blocking IO (Jav

all Chinese technical books translate selector into selectors, but in fact I think this kind of translation is not appropriate, the selector is only literal meaning, can not reflect the function and characteristics of selector.The key to the implementation of Java NiO described above is the multiplexing I/O technology, where the core of multiplexing is to poll the channel registered on it through selector, and when one or more channel is found to be in a ready state, An I/O operation is perform

' queue is the ' full would be refused. The default value is 100. A lot of data on the Internet shows that the maximum number of threads Linux is 1000,window will be higher than a little more than 2000. This should be based on the performance of the machine CPU and so on. The actual configuration data should be based on their own machine and load situation to try to find an optimal configuration. 3, Tomcat bio,nio,apr Three kinds of advanced connector operation mode. Tomcat supports the above

consist of wavelength multiplexer/multiplexer, wavelength-selective space switch and wavelength switch (wavelength switches). At present, Wavelength division multiplexing (WDM) system is developed, which is about 10. Recently, a kind of 1.2tb/s wavelength division switching system has been developed, it adopts the wavelength division multiplexing number of 128, the maximum terminal number is 2048, and the

of IO processing. Differentiate between asynchronous and synchronous synchronization, a reliable and orderly operation mechanism, in the synchronous operation, the subsequent tasks to wait for the current call to return; Asynchronously, other tasks do not need to wait for the current call to return, depending on the event, callback mechanism to implement the task invocation. Blocking and non-blocking Blocked, the current thread is in a blocked state and cannot perform other tasks, only if the

to receive any input, even if it is running in the foreground. REDIRECT standard output and standard error to file nohup.out . In other words, the nohup command actually separates the child process from the session it is in.Note that the nohup command does not automatically turn the process into a "background task", so you must add a symbol.Seven, screen command and Tmux commandAnother idea is to use the terminal multiplexer (Terminal

multiple status bits that can be identified by selectorBuffer (buffer):A buffer is an area of memory (an array) that is wrapped in NiO as a buffer object. Buffer provides methods to access the memory.In bio, data is stored in a stream, and in NiO, the data is stored in a buffer.In addition to the Boolean other Java seven basic types have the corresponding buffer class. Most commonly used is the BytebufferSelector (multiplexer): Responsible for pollin

any input, even if it is running in the foreground. REDIRECT standard output and standard error to file nohup.out . In other words, the nohup command actually separates the child process from the session it is in.Note that the nohup command does not automatically turn the process into a "background task", so you must add a symbol.Seven, screen command and Tmux commandAnother idea is to use the terminal multiplexer (Terminal

operating system are generally full-duplex, so full-duplex channel streams can better map the underlying operating system's APIs.There are two major types of channel: Selectablechannel: User network read/write FileChannel: For file operations The Serversocketchannel and socketchannel that are involved in the following code are subclasses of Selectablechannel.2.4. Multiplexer SelectorSelector is the basis for Java NIO programming.Sel

is that when a connection is created, it does not need to correspond to a thread, this connection will be registered on the multiplexer, so all the connections need only one thread can be done, when the multiplexer in this thread polling, found the connection on the request to open a thread to handle, That is, a request for a threading pattern.In the process of NIO, when a request comes in, open the thread

Java NiO Core Class library Multiplexer selector is based on epoll multiplexing technology implementation Compared to select, poll system calls, Epoll has the following advantages: 1. The socket descriptor (FD) that supports one process opens is unrestricted and limited to the maximum number of file handles for the operating system.The biggest flaw in select is that there is a limit to the amount of FD opened by a single process, set by Fd_setsize, an