It depends on the latency. If it's a couple hundred milliseconds you can use
Arc, or Orc with user-triggered garbage collecting.If you go below say 50ms,
system memory allocations might take longer than the deadline of your processing
routine, so you will want avoid them. You can go stack-only (probably easiest
and safest if your data is mostly numeric) and use gc\:none, or write your own
simplistic memory allocator that will return pointers from a large chunk of
pre-allocated memory. You can probably get to about 1ms latency if required if
you tune your interrupts a little.