at recent releases of OS X ignore attempts to set
        <TT
CLASS="VARNAME"
>SHMMAX</TT
> to a value that isn't an exact multiple of 4096.
       </P
><P
>        <TT
CLASS="VARNAME"
>SHMALL</TT
> is measured in 4 kB pages on this platform.
       </P
><P
>        In older OS X versions, you will need to reboot to have changes in the
        shared memory parameters take effect.  As of 10.5 it is possible to
        change all but <TT
CLASS="VARNAME"
>SHMMNI</TT
> on the fly, using
        <SPAN
CLASS="AP