cwdm 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

slices and threads occupy memory resources. In addition, each time a socket connection is established, a new thread is created at the same time to communicate with the socket separately (in a blocking manner). This approach has fast response times and is easy to control. It is very effective when the number of connections is low, but if a thread is generated for each connection, it is undoubtedly a waste of system resources, and if the number of connections is high, there will be insufficient r

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 (Java NIO): Synchronous non-blocking, the server implementation mode is a request for a thread, that is, the connection request sent by the client is registered to the multiplexer, and the multiplexer polls to the connection with an I/O request

blocked until read-write is completed).③ non-blocking: ATM queued withdrawals, you can call while waiting. 1.Java support for bio, NIO, AIO:①java 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.②java NIO: Sync