* For the case where multiple processes are run using the `--in-memory` EAL flag,
but no `--file-prefix` flag, or the same `--file-prefix` flag,
those processes will all share the same runtime directory.
* For the case where multiple processes are run using the `--in-memory` EAL flag,
but no `--file-prefix` flag, or the same `--file-prefix` flag,
those processes will all share the same runtime directory.