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+$Header: /cvsroot/pgsql/doc/src/sgml/runtime.sgml,v 1.52 2001/02/16 16:10:06 momjian Exp $
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<Chapter Id="runtime">
<para>
By default, only 4 MB of shared memory is supported. Keep in
mind that shared memory is not pageable; it is locked in RAM.
- To increase the number of buffers supported by the
- postmaster, increase <varname>SHMMAXPGS</> by 1024 for every
- additional 4 MB of shared memory:
+ To increase the number of buffers supported by the postmaseter, add the
+ following to your kernel config file. A <varname>SHMALL</> value of 1024
+ represents 4MB of shared memory. Increase it accordingly:
<programlisting>
-/sys/sys/shm.h:69:#define SHMMAXPGS 1024 /* max hardware pages... */
+options "SHMALL=4096"
+options "SHMMAX=\(SHMALL*PAGE_SIZE\)"
</programlisting>
- The default setting of 1024 provides a maximum of 4 MB of shared
- memory.
</para>
</formalpara>
the bpatch value, plus add 1 for every additional 4 MB of
shared memory you desire.
<programlisting>
-/sys/i386/i386/i386_param.c:28:#define SYSPTSIZE 0 /* dynamically... */
+options "SYSPTSIZE=13"
</programlisting>
<varname>sysptsize</> can not be changed by sysctl on the fly.
</para>