protecting some processes from out-of-swap killer

[Konstantin Belousov]

On Sat, Apr 25, 2015 at 01:31:14PM +0300, Dmitry Morozovsky wrote:
> Hi there colleagues,
> 
> I have stable/10 on a rather big machine (2*8*2 e5 Xeon, 64G RAM, SAS+SSD ZFS 
> raid10+ZIL+L2ARC) acting as a PostgreSQL server. 
64G RAM is not big by modern standards, normally populated desktop can
take 32G.

> 
> To use such a big resource pool that is mostly idle, I'd deployed poudriere 
> there (using tmpfs) too.
> 
> Most times this combination works like a charm: LA could be 60+ and no visual 
> latency increase on SQL queries.
> 
> However, sometimes postgres processes got killed by 'out of swap space'.  
> I suppose the source of problem could be that VSZ size of postgres processes 
> (8-9 G) is bigger than swap congigured (4G).
> 
> Is there any way to prevent this, besides reallocating space for swap?
Read protect(1).

> 
> Quick googling does not help, at least I could not find answers relevant 
> enough.
> 
> Thanks!
> 
> 
> -- 
> Sincerely,
> D.Marck                                     [DM5020, MCK-RIPE, DM3-RIPN]
> [ FreeBSD committer:                                 marck at FreeBSD.org ]
> ------------------------------------------------------------------------
> *** Dmitry Morozovsky --- D.Marck --- Wild Woozle --- marck at rinet.ru ***
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