Does Stale Page Cache use the same memory area as First Level Page Cache?


I’m trying to figure out what settings to configure for Stale Page Caching (SPC) and First Level Page Caching (FLPC); I understand that to enable the former I first have to enable the latter.

My question is: do the two caches cache items in memory using the same or separate collections?

I’m guessing the answer is ‘separate’ but would prefer to confirm. I’m trying to estimate what numbers I should set the maxEntriesLocalHeap for SPC and maxSize for FLPC, and if they add up, I have to take this into account as it increases requirements for heap size.