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Properly document semphore requirements by accounting for worker

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processes.

Backpatch to 9.1 and 9.0.

Submitted by Anton Yuzhaninov, confirmed by Robert Haas
This commit is contained in:
Bruce Momjian 2011-09-06 11:08:32 -04:00
parent 5c8676ea71
commit d764835bbc
1 changed files with 3 additions and 3 deletions
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6
doc/src/sgml/runtime.sgml
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@ -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