Re^5: Parallel::Forkmanager and large hash, running out of memory

[pokki]

The relevant doc is here.

The tl;dr: version is: any number of processes can read at the same time. When a process wants to write to the database, the engine is notified, waits for current readers to finish, then gives exclusive access to the writer process. No one can read while a write is occurring. When the write is finished, everybody can start reading again.