I didn't realize who I was replying to! But yes in rust. I have messed with mutable statics with a mutex and maybeuinit mostly for exporting stuff as a cdylib that has mutable state, and found I lose some of what I love about rust. So I heap allocate once and do borrows for each stage in my pipeline (SDR stuff). Sometimes a stage copies to cuda device mem, or back, or doesn't and just carries a device pointer through behind an abstraction. Is there a good reason to avoid preallocation on the heap?