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<chapter Id="runtime">

<para>

<systemitem class="osname">FreeBSD</> versions before 4.0 work like

<systemitem class="osname">NetBSD</> and <systemitem class="osname">

OpenBSD</> (see below), except that the configuration file uses the

keyword "options" instead of "option".

OpenBSD</> (see below).

</para>

</listitem>

</varlistentry>

to be enabled when the kernel is compiled. (They are by

default.) The maximum size of shared memory is determined by

the option <varname>SHMMAXPGS</> (in pages). The following

shows an example of how to set the various parameters:

shows an example of how to set the various parameters

(<systemitem class="osname">OpenBSD</> uses <literal>option</> instead):

<programlisting>

option SYSVSHM

option SHMMAXPGS=4096

option SHMSEG=256

option SYSVSEM

option SEMMNI=256

option SEMMNS=512

option SEMMNU=256

option SEMMAP=256

options SYSVSHM

options SHMMAXPGS=4096

options SHMSEG=256

options SYSVSEM

options SEMMNI=256

options SEMMNS=512

options SEMMNU=256

options SEMMAP=256

</programlisting>

</para>