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<chapter Id="runtime">

sysctl -w kern.sysv.shmseg

sysctl -w kern.sysv.shmall

</programlisting>

In OS X 10.3, these commands have been moved to <filename>/etc/rc</>

and must be edited there. You'll need to reboot to make changes

take effect. Note that <filename>/etc/rc</> is usually

overwritten by OS X updates (such as 10.3.6 to 10.3.7) so you

should expect to have to redo your editing after each update.

In OS X 10.3 and later, these commands have been moved to

<filename>/etc/rc</> and must be edited there. Note that

<filename>/etc/rc</> is usually overwritten by OS X updates (such as

10.3.6 to 10.3.7) so you should expect to have to redo your editing

after each update. In all versions, you'll need to reboot to make

changes take effect.

</para>

<!--

It might appear that we could recommend putting sysctl settings into

/etc/sysctl.conf so that they aren't destroyed by OS version updates.

This does not work as of OS X 10.4.2, however, because /etc/rc

promptly overrides whatever SHM settings are read from sysctl.conf :-(

Perhaps someday we can recommend this ...

-->

<para>

<varname>SHMALL</> is measured in 4KB pages on this platform.

Also note that some releases of OS X will reject attempts to

set <varname>SHMMAX</> to a value that isn't an exact multiple

of 4096.

</para>

</listitem>

</varlistentry>