ation that the server
        should use.  Possible values are <code class="literal">posix</code> (for POSIX shared
        memory allocated using <code class="literal">shm_open</code>), <code class="literal">sysv</code>
        (for System V shared memory allocated via <code class="literal">shmget</code>),
        <code class="literal">windows</code> (for Windows shared memory),
        and <code class="literal">mmap</code> (to simulate shared memory using
        memory-mapped files stored in the data dir