Re: Pre-allocation of shared memory ...

Tom Lane wrote:
> [snip]
> The
> setting now called "paranoid overcommit" is IMHO the *only* acceptable
> one for any sort of server system. With anything else, you risk having
> critical userspace daemons killed through no fault of their own.

Wow. Thanks for the info. I found the documentation you are referring
to in Documentation/vm/overcommit-accounting (on a stock RH9 machine).

It seems that the overcommit policy is set via the sysctl
`vm.overcommit_memory'. So...

[root(at)bilbo src]# sysctl -a | grep -i overcommit
vm.overcommit_memory = 0

...the default seems to be "Heuristic overcommit handling". It seems
that what we want is "vm.overcommit_memory = 3" for paranoid overcommit.

Thanks for getting to the bottom of this Tom. It *is* insane that the
default isn't "paranoid overcommit".

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Jon Lapham <lapham(at)extracta(dot)com(dot)br> Rio de Janeiro, Brasil
Work: Extracta Moléculas Naturais SA http://www.extracta.com.br/
Web: http://www.jandr.org/
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