From: Bruce Momjian <bruce@momjian.us>
Date: Mon, 13 Oct 2014 21:23:36 +0000 (-0400)
Subject: doc:  mention more changes needed to use huge pages
X-Git-Tag: REL9_5_ALPHA1~1362
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=ebd33f27ab023ef0e72ba162f2974ec49d96e8e3;p=postgresql

doc:  mention more changes needed to use huge pages

Report by Laurence Parry
---

diff --git a/doc/src/sgml/runtime.sgml b/doc/src/sgml/runtime.sgml
index 639b288e06..026850a1cf 100644
--- a/doc/src/sgml/runtime.sgml
+++ b/doc/src/sgml/runtime.sgml
@@ -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