| From: | Radosław Smogura <rsmogura(at)softperience(dot)eu> |
|---|---|
| To: | Florian Pflug <fgp(at)phlo(dot)org> |
| Cc: | PG Hackers <pgsql-hackers(at)postgresql(dot)org>, "Markus Wanner" <markus(at)bluegap(dot)ch> |
| Subject: | Re: POSIX question |
| Date: | 2011-06-20 15:30:31 |
| Message-ID: | 201106201730.31648.rsmogura@softperience.eu |
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| Thread: | |
| Lists: | pgsql-hackers |
Florian Pflug <fgp(at)phlo(dot)org> Monday 20 of June 2011 17:07:55
> On Jun20, 2011, at 17:05 , Radosław Smogura wrote:
> > I'm sure at 99%. When I ware "playing" with mmap I preallocated,
> > probably, about 100GB of memory.
>
> You need to set vm.overcommit_memory to "2" to see the difference. Did
> you do that?
>
> You can do that either with "echo 2 > /proc/sys/vm/overcommit_memory"
> or by editing /etc/sysctl.conf and issuing "sysctl -p".
>
> best regards,
> Florian Pflug
I've just created 127TB mapping in Linux - maximum allowed by VM. Trying
overcommit with 0,1,2.
Regards,
Radek
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