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Which IPC mechanism should be use between processes to get the best performance


The most efficient mechanism is the direct-communication, see the next questions.

Otherwise, MOSIX is not different from Linux: depending on the particular needs of the process, whatever approach (other than shared-memory) that is best in Linux is best on MOSIX. It could be pipes, SYSV-messages, UNIX-sockets, TCP-sockets and files.

Obviously files can be slow when they usually require writing on a physically-moving surface and/or networking. On the other hand, Linux has very good caching mechanisms for local files.