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help / color / mirror / Atom feedFrom: Tom Lane <[email protected]>
To: Magnus Hagander <[email protected]>
Cc: Julien Rouhaud <[email protected]>
Cc: Don Seiler <[email protected]>
Cc: pgsql-admin <[email protected]>
Subject: Re: Estimating HugePages Requirements?
Date: Wed, 09 Jun 2021 15:15:37 -0400
Message-ID: <[email protected]> (raw)
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Magnus Hagander <[email protected]> writes:
> I wonder how hard it would be to for example expose that through a
> commandline switch or tool.
Just try to start the server and see if it complains.
For instance, with shared_buffers=10000000 I get
2021-06-09 15:08:56.821 EDT [1428121] FATAL: could not map anonymous shared memory: Cannot allocate memory
2021-06-09 15:08:56.821 EDT [1428121] HINT: This error usually means that PostgreSQL's request for a shared memory segment exceeded available memory, swap space, or huge pages. To reduce the request size (currently 83720568832 bytes), reduce PostgreSQL's shared memory usage, perhaps by reducing shared_buffers or max_connections.
Of course, if it *does* start, you can do the other thing.
Admittedly, we could make that easier somehow; but if it took
25 years for somebody to ask for this, I'm not sure it's
worth creating a feature to make it a shade easier.
regards, tom lane
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