Re: Problems tuning shared_buffers value

Tom Lane wrote:
> Bill Moran  writes:
> 
>>curious about some things, so I set shared_buffers to 16 (which the
>>config file claims is the lowest allowable value)  The result was
>>that Postgre refused to start.  I upped it to 32 and the result
>>was the same.
>>I looked in both /var/log/messages and in /usr/local/pgsql/logfile
>>and found nothing about _why_ it wouldn't start,
> 
> 
> There's something broken about your logging setup then, because the
> postmaster will most definitely tell you why it's not starting:
> 
> $ postmaster -B 16
> postmaster: The number of buffers (-B) must be at least twice the number of allowed connections (-N) and at least 16.
> $ postmaster -B 32
> postmaster: The number of buffers (-B) must be at least twice the number of allowed connections (-N) and at least 16.
> $
> 
> Without having looked at the code, I think that these very-early-startup
> messages may only get sent to stderr and not syslog; so take another
> look at what you're doing with the postmaster's stderr.

Ahhhh ... The startup script that the FreeBSD ports install redirects it
to /var/log/pgsql, which I hadn't noticed.
And I see the exact error messages you describe.

Thanks, Tom.

-- 
Bill Moran
Potential Technologies
http://www.potentialtech.com