On Wed, 20 Apr 2011, Gwenhael Le Moine wrote:
> 2011/4/20 Hieu D. Bui <[email protected]>:
> >
> > In my use case, I would like to ensure that all the open documents have
> > been synced to disk before I drop the cache (which reduces the memory
> > used size, therefore it fastens the hibernation process). Sometimes,
> > hibernation doesn't work properly too, for example, it can't freeze
> > the filesystems and/or processes.
> >
> > D. Hieu
>
> Interesting idea. I wasn't sure if hibernating would effectively save
> disk-caches and a quick say it does and suggest to do what you want to
> do.
>
Dear folks,
Suspend-to-disk (aka hibernation) doesn't call sync() before
performing. I've got several page-fault situations and data
corruption when doing improperly hibernating (i.e. plugging on/off
some peripheral devices, especially USB flash disk).
>
> But I think there's a trade-off to that technique: when the computers
> wake up it won't have any disk cache and will spend some time to
> rebuild it, so for some time after wake-up the computer might be less
> responsive.
>
That's not necessary true, depending on the techniques your operating
system uses. Hibernation does almost exactly the same as
suspend-to-ram, except for the destination to store data.
>
> Personally I've stopped hubernating years ago, suspend-to-ram is
> nearly instant and has never failed me (and my wife is constantly
> stealing my laptop because hers take ages to get out of hibernation :P
> )
>
> Gwenhael
>
Suspend-to-ram still consumes energy, man. Hibernation is for greener
planet ;-).
Cheers,
Yang
--
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