have look at shm-typed-lru and shm-lru-cache

[rleddy]

I threw these together last year. I am hoping to have them in use this summer.

npm shm-lru-cache
npm shm-lru-cache

It would be nice if someone tested them out or raised some issues. These are C++ based and use shared memory. (Maybe they only really work on Linux.) Basically, the shared memory is a slab with predetermined size and element sizes. In other code, I have something that ages things out into secondary slabs on backup machines (slower, etc.)

I am starting put things into TypeScript and Rust as well. I may go over these again with TypeScript and see if the C++ can expand any. (But, time is beckoning on other things to do at the moment.)