Skip site navigation (1) Skip section navigation (2)

Re: 7.3b2 initdb fails with semaphore error (solved)

From: Mark Stosberg <mark(at)summersault(dot)com>
To: pgsql-bugs(at)postgresql(dot)org
Subject: Re: 7.3b2 initdb fails with semaphore error (solved)
Date: 2002-10-02 19:17:03
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-bugs
On Tue, 1 Oct 2002, Tom Lane wrote:

> Mark Stosberg <mark(at)summersault(dot)com> writes:
> > I think the bug here is that this message advertises that I can change
> > the "max_connections" parameter to address this, but there does not
> > appear to be a way to do this.  The max_connections option is located
> > on my system at /usr/local/share/postgresql/postgresql.conf.sample
> > (prior to initdb)
> Hmm ... actually, I don't think the max_connections parameter is used
> during standalone operation.  It looks like the code uses a hardwired
> value of "16".  We could reduce that (there's probably no good reason
> why it's not "1"), but I suspect your SEMMAX parameter is so small
> it will fail anyway :-(
> Would you try changing "16" to "1" in InitCommunication() in
> src/backend/utils/init/postinit.c, and see if that helps on your
> setup?


I tried this change, and was able to successfully "initdb" after that,
and then run "psql" after that. I'm running this installation on a home
machine for light use, so I may not need 16 backends anyway.

If you're correct that there is no need to have more than 1 backend
during "initdb", then perhaps this could be turned into a patch. My
simple patch is below:



--- postinit.c.orig     Wed Oct  2 12:56:13 2002
+++ postinit.c  Wed Oct  2 12:56:42 2002
@@ -176,7 +176,7 @@
                 * postmaster.  Create private "shmem" and semaphores.  Setting
                 * MaxBackends = 16 is arbitrary.
-               CreateSharedMemoryAndSemaphores(true, 16, 0);
+               CreateSharedMemoryAndSemaphores(true, 1, 0);

In response to

pgsql-bugs by date

Next:From: Nic FerrierDate: 2002-10-02 22:26:46
Subject: 7.3B2 initdb fails
Previous:From: pgsql-bugsDate: 2002-10-02 02:18:24
Subject: Bug #793: ODBC driver does not compile on Sun Solaris

Privacy Policy | About PostgreSQL
Copyright © 1996-2017 The PostgreSQL Global Development Group