From: Mark Kirkwood <markir@coretech.co.nz>
To: pgsql-docs@postgresql.org
Subject: Instructions for FreeBSD ipc config showing age
Date: Tue, 01 Feb 2005 10:55:51 +1300
Message-ID: <41FEA967.8000906@coretech.co.nz> (raw)
A recent mailing on the -perf list highlighted that the docs concerning
ipc configuration are a bit out for date for FreeBSD.
The attached patch separates out FreeBSD from Open/NetBSD, and shows how
to change settings via sysctl w/o a kernel rebuild. Any thoughts?
BTW I suspect that both Open and NetBSD are in need of an update too,
however I don't have any installations of such to experiment on.
regards
Mark
Attachments:runtime.sgml.diff (text/plain, 3.6K) download--- runtime.sgml.orig Sat Jan 29 18:30:50 2005+++ runtime.sgml Mon Jan 31 22:30:35 2005@@ -4350,10 +4350,8 @@
<varlistentry>
- <term><systemitem class="osname">FreeBSD</></term>
<term><systemitem class="osname">NetBSD</></term>
<term><systemitem class="osname">OpenBSD</></term>
- <indexterm><primary>FreeBSD</><secondary>IPC configuration</></>
<indexterm><primary>NetBSD</><secondary>IPC configuration</></>
<indexterm><primary>OpenBSD</><secondary>IPC configuration</></>
<listitem>
@@ -4364,25 +4362,66 @@
the option <varname>SHMMAXPGS</> (in pages). The following
shows an example of how to set the various parameters:
<programlisting>
-options SYSVSHM-options SHMMAXPGS=4096-options SHMSEG=256+option SYSVSHM+option SHMMAXPGS=4096+option SHMSEG=256-options SYSVSEM-options SEMMNI=256-options SEMMNS=512-options SEMMNU=256-options SEMMAP=256+option SYSVSEM+option SEMMNI=256+option SEMMNS=512+option SEMMNU=256+option SEMMAP=256
</programlisting>
- (On <systemitem class="osname">NetBSD</> and <systemitem- class="osname">OpenBSD</> the key word is actually- <literal>option</literal> singular.)
</para>
<para>
You might also want to configure your kernel to lock shared
memory into RAM and prevent it from being paged out to swap.
Use the <command>sysctl</> setting
<literal>kern.ipc.shm_use_phys</>.
+ </para>+ </listitem>+ </varlistentry>+++ <varlistentry>+ <term><systemitem class="osname">FreeBSD</></term>+ <indexterm><primary>FreeBSD</><secondary>IPC configuration</></>+ <listitem>+ <para>+ The default settings are only suitable for small installations + (default <varname>SHMMAX</varname> is 32 MB). Changes can be made via+ the <command>sysctl</command> or <command>loader</command> interfaces.+ Firstly the ones that are settable using <command>sysctl</command>:+<screen>+<prompt>$</prompt> <userinput>systcl -w kern.ipc.shmall=32768</userinput>+<prompt>$</prompt> <userinput>systcl -w kern.ipc.shmmax=134217728</userinput>+<prompt>$</prompt> <userinput>systcl -w kern.ipc.semmap=256</userinput>+</screen>+ These to be saved between reboots in <filename>/etc/sysctl.conf.+ </para>+ <para>+ The remaining sempahore settings are read only as far as + <command>sysctl</command> is concerned, but can be changed before boot + using the <command>loader</command> prompt:+<screen>+<prompt>(loader)</prompt> <userinput>set kern.ipc.semmni=256</userinput>+<prompt>(loader)</prompt> <userinput>set kern.ipc.semmns=512</userinput>+<prompt>(loader)</prompt> <userinput>set kern.ipc.semmnu=256</userinput>+</screen>+ Similarly these can be saved between reboots in + <filename>/boot/loader.conf</filename>.+ </para>+ <para>+ You might also want to configure your kernel to lock shared+ memory into RAM and prevent it from being paged out to swap.+ Use the <command>sysctl</> setting+ <literal>kern.ipc.shm_use_phys</>.+ </para>+ <para>+ Versions before 4.0 will require a kernel rebuild, see the+ <systemitem class="osname">NetBSD</> and <systemitem+ class="osname">OpenBSD</> instructions above, however the key word is + <literal>options</literal> (plural) in this case.
</para>
</listitem>
</varlistentry>
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To: pgsql-docs@postgresql.org
Cc: markir@coretech.co.nz
Subject: Re: Instructions for FreeBSD ipc config showing age
In-Reply-To: <41FEA967.8000906@coretech.co.nz>
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