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doc: mention more changes needed to use huge pages

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Report by Laurence Parry
This commit is contained in:
Bruce Momjian 2014-10-13 17:23:36 -04:00
parent fe65280fea
commit ebd33f27ab
1 changed files with 7 additions and 0 deletions
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doc/src/sgml/runtime.sgml
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@ -1360,6 +1360,13 @@ $ <userinput>sysctl -w vm.nr_hugepages=3170</userinput>
this setting through reboots.
</para>
<para>
It is also necessary to give the database server operating system
user permission to use huge pages by setting
<varname>vm.hugetlb_shm_group</> via <application>sysctl</>, and
permission to lock memory with <command>ulimit -l</>.
</para>
<para>
The default behavior for huge pages in
<productname>PostgreSQL</productname> is to use them when possible and