> Hi Mike, all,
>
> So why is it advisable to run in lazy mode?
>
> Well, you will simply use less swap space, as it will only be allocated
> when really needed.
>
> So, it is interesting to use lazy swap when you currently have
> swap-trouble (less than 10% free, tc...), or when you are planning a SAP
> upgrade. Remember that those nutcases at SAP ask for 20Gb of swap when
> installing a 4.6B! Does anyone actually configure that much?
>
> Ciao,
>
> J.
>
> -----Original Message-----
> From: Michael Whittaker (QDT) [SMTP:Michael.Whittaker_at_edt.ericsson.se]
> Sent: Friday, August 11, 2000 13:23
> To: 'Van de Perre Jochen (Cronos)'
> Subject: RE: SUMMARY: Lazy swap
>
> Hi
>
> I might have missed something but why is it advisable to run in lazy mode
> if there is no perfirmance gain and it suffers from the problems you have
> described.
>
> We run oracle/sap here some I'm quite interested.
>
> regards - Mike
>
> -----Original Message-----
> From: Van de Perre Jochen (Cronos)
> [mailto:Jochen.VanDePerre_at_UCB-Group.com]
> Sent: Friday, August 11, 2000 1:16 PM
> To: DEC managers (E-mail)
> Subject: SUMMARY: Lazy swap
>
>
> Thanks to:
>
> Dagmar Galama
> Ann Buck
> Jim Belonis
>
> -It IS advisable to use lazy swap.
> -No problems specifically related to Oracle or SAP.
> -No performance gain.
> -One downside to lazy swap:
>
> It allows a dead lock situation where a process needs page/swap space and
> there isn't any. The system will prevent the dead lock from occuring by
> killing processes until there is sufficient page/swap space. It seems to
> prefer idle processes, but in extreme cases will take whatever it can
> find.
> It ignores little. This will likely cause very mysterious symptoms which
> will
> be hard to diagnose. E.g. you try to run a big oracle job, and a few
> minutes
> or hours later cron dies or inetd dies, or nfs dies, or a completely
> unrelated oracle job dies.
>
> Ciao,
>
> J.
>
>
>
>
Received on Fri Aug 11 2000 - 11:35:05 NZST
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