Improved read performance with a larger hybrid buffer pool A caching architecture that can take advantage of present and future low-cost memory drives Concepts The following terms are applicable to the buffer pool extension feature. For more information, see this definition. Thus, the buffer cache is divided into 8-KB pages.
Terminating sockets[ edit ] The operating system does not release the resources allocated to a socket until the socket is closed. This is especially important if the connect call fails and will be retried.
When an application closes a socket, only the interface to the socket is destroyed. It is the kernel's responsibility to destroy the socket internally. Setting up a simple TCP server involves the following steps: Creating a TCP socket, with a call to socket. Binding the socket to the listen port, with a call to bind.
Converting a short int to network byte order can be done by calling the function htons host to network short. Preparing the socket to listen for connections making it a listening socketwith a call to listen.
Accepting incoming connections, via a call to accept. This blocks until an incoming connection is received, and then returns a socket descriptor for the accepted connection.
The initial descriptor remains a listening descriptor, and accept can be called again at any time with this socket, until it is closed. Communicating with the remote host, which can be done through send and recv or write and read.
Eventually closing each socket that was opened, once it is no longer needed, using close. The following program creates a TCP server on port number Communicating with the server by using send and recv or write and read.
Terminating the connection and cleaning up with a call to close. UDP packets may arrive out of order, multiple times, or not at all. Being connectionless means that there is no concept of a stream or permanent connection between two hosts. Such data are referred to as datagrams Datagram Sockets.
Server[ edit ] An application may set up a UDP server on port number as follows. The programs contains an infinite loop that receives UDP datagrams using recvfrom.
Caveats[ edit ] For TCP connections, the operating system may have to retransmit the data given to it with a write call. However, the user space program is free to delete the data buffer passed to write after write returns.
Other APIs, such as those supporting RDMA require that the data buffer is not released until the acknowledgement from the remote end has been received and thus make it possible to have zero memory copy operations.Resource I wrote a non-blocking TCP server for everyone (r-bridal.comv) submitted 2 years ago * by [deleted] I'm trying to make it as easy as possible to write an asynchronous TCP server that can scale to millions (yes, millions) of connections.
Here’s a complete example. This server opens TCP port , and marks the listening socket as non-blocking. The server then loops, repeatedly asking for a new connection.
I have two simple applications: A Server application that waits on a specific tcp port for a client to connect. Then listens to what he says, send back some feedback and DISCONNECT that client.
Netcat ===== /\_/\ / 0 0 \ Netcat is a simple Unix utility which reads and writes data ====v==== across network connections, using TCP or UDP protocol. This article is a technical overview of the new features and changes in Version 10, including enhancements that were delivered as part of that became generally available on June 3, Network Monitoring Platforms (NMPs) - Comparison of NMPs, ActionPacked!
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