Process, the lack of file descriptors
If you have a Web server or other key processes assigned a file descriptor, but it needs more file descriptors, then the server or the process will be suspended or error, until the received file descriptor until the required . File descriptor is used to keep open the file and open socket track record, open the file and open socket is a Web server is a key component of its mandate is to copy the file to a network connection. By default, most of the shell there are 64 descriptors, which means that each process can be started from the shell at the same time to open 64 files and network connections. Most of the shell has a built-in ulimit command to increase the number of file descriptors.
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