There's nothing special about threads vs processes in Linux. mmap works the same, the challenge is to map the same file. You can share a path, pass a file descriptor via fork or unix domain socket, among other techniques.
There's nothing special about threads vs processes in Linux. mmap works the same, the challenge is to map the same file. You can share a path, pass a file descriptor via fork or unix domain socket, among other techniques.
That induces disk I/O overhead (even if it somehow doesn't impact IPC performance)
It doesnt. Processes can share memory
The file doesn’t have to be disk-backed.
Don't you need something mounted for that?
No, you can use a memfd.
And `/dev/shm/` (which postgres uses by default on most Unix platforms)