Creating multiple command pools per thread in Vulkan

Question

I am trying to set up a multi-threaded renderer with Vulkan and I have a question about command pools.

Here https://on-demand.gputechconf.com/siggraph/2016/video/sig1625-tristan-lorach-vulkan-nvidia-essentials.mp4 at 13 minutes, they talk about how you should make 1 command pool per FRAME and cycle them in a ring buffer.

Why allocate 3 command pools per thread(one for each frame in a 3-frame ring buffer) instead of having just one command pool per thread and having 3 command buffers from it?

Answer 1

I think the premise here is that vkResetCommandPool is better than resetting individual command buffers. Which also requires VK_COMMAND_POOL_CREATE_RESET_COMMAND_BUFFER_BIT flag, whose existence is a little hint by the Specification itself that the ability to reset individual cmdbuffers may not be for free.

Actually the speaker says so if you do not just read slides but get the full presentation.