But the insidious thing is they'll be inlined all over the place and may not show up on callgrind. The atomic operations will contribute to cache lock contentio

But the insidious thing is they'll be inlined all over the place and may not show up on callgrind. The atomic operations will contribute to cache lock contention inside the processor. Of course it all depends on often you perform operations on the shared_ptrs. Use them only as handles to large components and keep them out of inner loops and you'll be fine.