Larry Troxler:

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another feature of the -rt mode is the memory locking ... it's enabled on machines, where _POSIX_MEMLOCK is defined (at least on linux it is). this will force the memory to be represented in the physical memory. (one will not be able to allocate more memory).

I thought that the memory locking was done by a seperate system call, and that setting the scheduling policy to SCHED_FIFO or SCHED_RR by itself did not lock memory. Also, you can still allocate memory after making this call. I had assumed that if you use memlockall (or however it's spelled), that any memory allocated after the call will also be locked (is this correct?)

Only if you add the MCL_FUTURE flag to the mlock/mlockall call. I presume pd does that.

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