Re: Persistance and boot scripts (was: Re: L4-HURD , POSIX, UNIX)

[Marcus Brinkmann]

At Mon, 07 Nov 2005 11:25:53 -0500,
"Jonathan S. Shapiro" <address@hidden> wrote:
> 
> On Mon, 2005-11-07 at 15:02 +0100, Marcus Brinkmann wrote:
> > I definitely agree that there is a range of options between
> > persistence and non-persistence.  Well, in fact there is exactly one
> > third option, and that is orthogonal persistence, but of course you
> > can vary the extent on which the persistence attribute applies.
> 
> Just to make sure that we are having the same conversation, I am aware
> of only three foundational persistence mechanisms:
> 
>   1. Non-persistence
>   2. Per-process persistence, which can be aggregated into sessions by
>      persisting multiple processes as a group.
>   3. Machine-wide persistence
> 
> Is there a fourth mechanism that I am missing?
> 
> The performance of per-process persistence is bad, and the complexity is
> very high.

What I meant with the "third option" is your number 2.  The "varying
degree" would be the number of processes you checkpoint.

So, I think we agree.
 
Thanks,
Marcus