Re: shmget fails on OS X with proper settings - Mailing list pgsql-general

sysctl -a reveals the following:
kern.sysv.shmmax: 12582912
kern.sysv.shmmin : 1
kern.sysv.shmmni: 32
kern.sysv.shmseg: 8
kern.sysv.shmall: 1024
kern.sysv.semmni: 87381
kern.sysv.semmns: 87381
kern.sysv.semmnu: 87381
kern.sysv.semmsl: 87381
kern.sysv.semume: 10

I am using the sysctl.conf file in /etc to set these values at boot
time, but in that file I only have the following entries:

kern.sysv.shmmax=12582912
kern.sysv.shmmin=1
kern.sysv.shmmni=32
kern.sysv.shmseg=8
kern.sysv.shmall=1024

When booting up in unix mode to view the output from all the startup
processes, I do notice that it looks like the sysctl values are read
and set twice, not sure if this would affect anything.

I checked the process listing for any other postmaster processes that
could have been left running, but nothing it showing up.  I'm using a
LaunchAgent to start postmaster, so it shouldn't be starting on its
own anyway.

On 5/7/07, Prashant Ranjalkar < prashant.ranjalkar@gmail.com> wrote:
> Hello,
>
> The previously running postmaster process might not closed properly and
> released the kernel's memory.
> Check for any process running on the server if it exists then kill the
> process.here due to unrelease of kernel's memory and while booting the
> process is not releasing shared memory hence leading to problems.
>
> regards
> Prashant Ranjalkar
> EnterpriseDB
>
>
>
>
>
>
> On 5/7/07, Christopher S Martin < martin.christopher.s@gmail.com> wrote:
> >
> > Martin:
> >
> > They didn't take any memory out of the machine.  AS for memory cache
> > parameters, I'm don't know about that.  How would I go checking for
> > that type of thing?
> >
> > Thanks,
> > Chris
> >
> > On 5/6/07, Martin Gainty <mgainty@hotmail.com > wrote:
> > > if you're getting memory errors then a guess would be did they take out
> any
> > > memory out of your machine or perhaps did they change your memory cache
> > > parameters???
> > > Martin
> > > This email message and any files transmitted with it contain
> confidential
> > > information intended only for the person(s) to whom this email message
> is
> > > addressed.  If you have received this email message in error, please
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> > > the sender immediately by telephone or email and destroy the original
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> > >
> > > ----- Original Message -----
> > > From: "Christopher S Martin" < martin.christopher.s@gmail.com >
> > > To: <pgsql-general@postgresql.org>
> > > Sent: Sunday, May 06, 2007 3:07 PM
> > > Subject: [GENERAL] shmget fails on OS X with proper settings
> > >
> > >
> > > > Hi to the list, its my first post.
> > > >
> > > > I was previous running postgres 8.2.1 on my OS X 10.4.9 laptop with no
> > > > problems.
> > > > After I sent it to apple care, I found that I can no longer start the
> > > > postmaster daemon.   When I try, I receive the standard shmget failed
> > > > error message:
> > > >
> > > > FATAL:  could not create shared memory segment: Cannot allocate memory
> > > > DETAIL:  Failed system call was shmget(key=5432001, size=4112384,
> 03600).
> > > > HINT:  This error usually means that PostgreSQL's request for a shared
> > > > memory segment exceeded available memory or swap space. To reduce the
> > > > request size (currently 4112384 bytes), reduce PostgreSQL's
> > > > shared_buffers parameter (currently 300) and/or its max_connections
> > > > parameter (currently 30).
> > > >
> > > > I get this error with either the settings recommended on the kernel
> > > > resources page:
> > > >
> > > > kern.sysv.shmmax=4194304
> > > > kern.sysv.shmmin=1
> > > > kern.sysv.shmmni=32
> > > > kern.sysv.shmseg=8
> > > > kern.sysv.shmall=1024
> > > >
> > > > And I also get it when i set kern.sysv.shmmax=12582912
> > > >
> > > > After making all these changed rebooting doesn't fix anything.
> > > >
> > > > Has anyone ran into this problem, or has any idea as to why this would
> > > > start to fail so suddenly?
> > > >
> > > > Thanks,
> > > > Chris
> > > >
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