From d764835bbc705f38311b5a6fe14a9aff4feb6fc3 Mon Sep 17 00:00:00 2001
From: Bruce Momjian <bruce@momjian.us>
Date: Tue, 6 Sep 2011 11:08:32 -0400
Subject: [PATCH] Properly document semphore requirements by accounting for
worker processes.
Backpatch to 9.1 and 9.0.
Submitted by Anton Yuzhaninov, confirmed by Robert Haas
---
doc/src/sgml/runtime.sgml | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/doc/src/sgml/runtime.sgml b/doc/src/sgml/runtime.sgml
index 5098aad130a..68ceff15303 100644
--- a/doc/src/sgml/runtime.sgml
+++ b/doc/src/sgml/runtime.sgml
@@ -604,13 +604,13 @@ psql: could not connect to server: No such file or directory
<row>
<entry><varname>SEMMNI</></>
<entry>Maximum number of semaphore identifiers (i.e., sets)</>
- <entry>at least <literal>ceil((max_connections + autovacuum_max_workers) / 16)</literal></>
+ <entry>at least <literal>ceil((max_connections + autovacuum_max_workers + 4) / 16)</literal></>
</row>
<row>
<entry><varname>SEMMNS</></>
<entry>Maximum number of semaphores system-wide</>
- <entry><literal>ceil((max_connections + autovacuum_max_workers) / 16) * 17</literal> plus room for other applications</>
+ <entry><literal>ceil((max_connections + autovacuum_max_workers + 4) / 16) * 17</literal> plus room for other applications</>
</row>
<row>
@@ -685,7 +685,7 @@ psql: could not connect to server: No such file or directory
linkend="sysvipc-parameters">). The parameter <varname>SEMMNI</>
determines the limit on the number of semaphore sets that can
exist on the system at one time. Hence this parameter must be at
- least <literal>ceil((max_connections + autovacuum_max_workers) / 16)</>.
+ least <literal>ceil((max_connections + autovacuum_max_workers + 4) / 16)</>.
Lowering the number
of allowed connections is a temporary workaround for failures,
which are usually confusingly worded <quote>No space
--
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