<!--

$Header: /cvsroot/pgsql/doc/src/sgml/runtime.sgml,v 1.184 2003/06/11 22:13:21 momjian Exp $

$Header: /cvsroot/pgsql/doc/src/sgml/runtime.sgml,v 1.185 2003/06/12 15:31:02 momjian Exp $

-->

<Chapter Id="runtime">

<filename>/usr/src/linux/include/asm-<replaceable>xxx</>/shmpara

m.h</> and <filename>/usr/src/linux/include/linux/sem.h</>.

</para>

<para>

Linux has poor default memory overcommit behavior. Rather than

failing if it can not reserve enough memory, it returns success,

but later fails when the memory can't be mapped and terminates

the application. To prevent unpredictable process termination, use:

<programlisting>

sysctl -w vm.overcommit_memory=3

</programlisting>

</para>

</listitem>

</varlistentry>