Re: wait until swapoff is *actually* finished (it returns too early)?
On Wed, Aug 21, 2024 at 02:18:44AM CEST, Greg Wooledge <greg@wooledge.org> said:
> On Tue, Aug 20, 2024 at 20:04:11 -0400, Roberto C. Sánchez wrote:
> > sync && sync && sync && swapoff
> >
> > I couldn't tell why I have sync 3 times, but I know that it's how I've
> > called swapoff since as far back as I can remember.
>
> Cargo cult. It was never useful to the best of my knowledge.
Once upon a time, the sync command would return before the actual
syscall where completed. Doing 3 times sync gave you a very high
probability that the first one indeed completed all its writes.
But it was already false in SunOS 4 (~1990)
--
Erwan David
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