He’s concerned with page faults because his workload involves disk access. The admonitions about cache locality matter more when your workload fits in RAM. Als

He’s concerned with page faults because his workload involves disk access. The admonitions about cache locality matter more when your workload fits in RAM. Also, he’s not using swap as such, he’s using memory-mapped IO. If you have to hit the disk, you have to hit the disk, might as well try to do it in an OS-aware fashion.