Re: Why shared_buffers max is 8GB?

Thanks Martin,
However this is a database dedicated server and nothing much else is running on it. Also, I never saw this happening with 9.2 – but I can’t vouch for the size of files that I was uploading.

From: Martin French
Sent: Wednesday, March 26, 2014 1:32 PM
To: Markella Skempri
Cc: desmodemone ; ik(at)postgresql-consulting(dot)com ; Alexey Vasiliev ; pgsql-performance(at)postgresql(dot)org ; pgsql-performance-owner(at)postgresql(dot)org
Subject: Re: [PERFORM] Why shared_buffers max is 8GB?

> I wanted to follow up from this question. I’m running on 9.3.4
> My DB server has 32GB ram so I have assigned 8GB
> shared_buffer_memory. It is quite a big db but with not much
> traffic. When there is traffic, it’s usually big.
>
> Lately, the kernel has been killing the postmaster for having
> assigned too much shared memory. Latest crash was when loading a 500MB file.
>
> Should I reduce the shared buffers in order for this to be more robust?
>
> Thanks
> Markella

It may be that other memory settings are contributing towards this (work_mem, maintenance_work_mem, max_connections etc).

I would suggest that the OOM killer is working as intended and something is not quite right within the config.

You may want to review the memory consumption at peak times taking into consideration anything else running on the machine.
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