On Wed, Aug 12, 2026 at 01:47:56PM +0000, Morten Brørup wrote: > Added a new high-performance lock-free "pile", using the Stack API. > The pile behaves roughly like a stack, but is not strictly LIFO. > > The pile is optimized for pushing/popping bulks of objects, which > it does significantly faster than the lock-free stack. > > Pushing/popping a number of objects not divisible by the compile time > configurable bulk size is handled gracefully, but not as fast as > complete bulks. > > Performance examples, stack_pile_perf_autotest vs. stack_lf_autotest: > > On a single core, pushing/popping 1 or 8 objects is similar speed. > On a single core, pushing/popping 32 objects is 2x faster. > On a single core, pushing/popping 512 objects is 10x faster. > > On four cores, pushing/popping 1, 8 or 32 objects is slightly faster. > On four cores, pushing/popping 512 objects is 4x faster. > How does it differ, or what are the benefits vs the standard stack. The LF stack I'd view as a strange edge case, since even with the standard MP/MC ring mempool driver you still have atomics on the fast-path and you will still get stalls if a thread gets context switched out in the middle of a mempool operation.
/Bruce
