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<Chapter Id="runtime">

consistently across different systems; <xref

linkend="sysvipc-parameters"> gives an overview. The methods to

set them, however, vary; suggestions for some platforms are given

below. Beaware thatyou will probably have to reboot your

below. Bewarned thatit is often necessary to reboot your

machine at least, possibly even recompile the kernel, to change these

settings.

</para>

You could put these commands into a script run at boot-time.

</para>

<para>

Alternatively, you can use

<citerefentry><refentrytitle>sysctl</refentrytitle>

<manvolnum>8</manvolnum></citerefentry>, if available, to

control these parameters. Look for a file called

<filename>/etc/sysctl.conf</filename> and add lines like the

following to it:

<programlisting>

kernel.shmall = 134217728

kernel.shmmax = 134217728

</programlisting>

This file is usually processed at boot time, but

<application>sysctl</application> can also be called

explicitly later.

</para>

<para>

Other parameters are sufficiently sized for any application.

If you want to see for yourself look into