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Does anyone have experience with Linux aio functions (io_*, not posix aio)? It would be great if someone could provide a link to some examples (or provide some examples here). Also, what are your general observations/comments about their use?
I am working on an I/O library and someone suggested I have a look at them. They are known to perform better than POSIX aio in certain cases and I would like to have a look.
Thanks.
Update: this shows an example for the native linux io interface
(This is an example on the posix aio interface).
As to some of the commentters on the question: the aio library allows a program to issue multiple parallel request in a way where the kernel can execute them in the order which is most efficient for seeks and disk rotation — i.e. the io request may not be executed in the order which they were issues which is different from making synchronous request in a thread. In very IO intensive applications this can dramatically increase IO performance, but for most applications it will just add complexity.