Should I call `vkMapMemory` each time I write to a buffer?

问题

Are there any benefits to using a single vkMapMemory, a memsets for each write, and a single vkUnmapMemory as opposed to using a vkMapMemory, memset, and vkUnmapMemory for each write to a buffer?

回答1:

Yes, it is beneficial to map only once. vkMapMemory likely needs to do some system calls, so it is not free.

Authoritative quote, e.g. https://developer.samsung.com/game/usage#buffermanagement:

Frequent Map/Unmap calls should be avoided.

来源：https://stackoverflow.com/questions/59118275/should-i-call-vkmapmemory-each-time-i-write-to-a-buffer