Increasing the number of semaphores on FreeBSD 4.1 
Author Message
 Increasing the number of semaphores on FreeBSD 4.1

Quote:

> > Hi -
> >       I recently tried to start postmaster (7.0.2) with -B 128 -N 64 and
> > got the "semget failed" error.  Looking in the faq[1] it says I need to
> > increase the amount allowed in the kernel.  It tells me what I need to do,
> > but my question is what values should I set them to?  Is there any way to
> > figure it out based on load, etc?  Also, are there detrimental effects to
> > setting them too high?

> What OS are you using?

FreeBSD 4.1

Quote:
> > [1] http://www.***.com/

> If it's FreeBSD we've documented the tunables here:
> http://www.***.com/

> The docs will probably also help if you're using BSD/os.

> Also you don't want to "go nuts" with raising these values, they
> can cause the kernel to allocate too much memory for these structures
> and cause problems booting or running your system.

Yeah, that's what I've seen... I guess I was wondering if there were any
guidelines to raising them..  I mean should I up the defaults by 10?  Or
up them by a percentage (to keep the relationship), etc...

??



Tue, 29 Apr 2003 12:34:23 GMT
 Increasing the number of semaphores on FreeBSD 4.1

Quote:
Philip Hallstrom writes:
>    I recently tried to start postmaster (7.0.2) with -B 128 -N 64 and
> got the "semget failed" error.  Looking in the faq[1] it says I need to
> increase the amount allowed in the kernel.  It tells me what I need to do,
> but my question is what values should I set them to?  Is there any way to
> figure it out based on load, etc?  Also, are there detrimental effects to
> setting them too high?

This may help:

http://www.postgresql.org/devel-corner/docs/admin/kernel-resources.htm

--



Wed, 30 Apr 2003 00:04:51 GMT
 
 [ 2 post ] 

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