Dear Rob,

>
> > 1.  You can delete all your old snapshots to reclaim disk space (or
> > relieve quota limits in a shared environment).  I used some
> > incantation with find, xargs, and rm (carefully) which cleared them
> > out for every worksheet all at once.  Like Jason I had a few gigabytes
> > worth across about 100 worsheets from about a year's worth of use.

Yes, we had figured that was part of the issue.  Running du .sage/
sage_notebook takes forever on my G4, for instance :)

>
> > 2.  I think the performance hit comes from backing up  nb.sobj, from
> > the original in .sage/sage_notebook to a collection of backups
> > in .sage/backups   The default timing on this is very frequent IIRC.
> > My nb.sobj is about 30 MB, but my home directory is on a portable USB
> > drive that I shuttle around, so I noticed the delays due to these auto-
> > saves perhaps sooner than others might.  I'm not sure what it takes to
> > shrink this file.  I set the autosave interval to be about 20 minutes
> > and am keeping fewer backups (two instead of three) and  no longer see
> > the regular slowdowns as I work in the notebook.

I see what is going on.  The problem is not the snapshotting, but the
backups to this file.  I assumed the discussion of autosave was
referring to worksheet.txt in all these tickets, but it is this
mysterious file.  Since it wasn't that big of a file, I thought maybe
it wasn't the problem.

(Out of curiosity, does this file also have any of the permissions for
notebooks? Probably irrelevant.)

>
> I set the autosave interval on sagenb.org to once per *day*.
>

Again, I remember that discussion, but didn't realize there were two
different autosaves going on here.

> > 3.  When I quit a server that has been running the notebook, it takes
> > about 2 minutes for a clean shutdown, which I assume is the same sort
> > of action.
>
> True.
>
>

Yes, it's taking astonishingly long to quit the notebook as well.

I will relay this to sysadmin AND try some of this out on my laptop,
and hopefully that will solve it.  I hope the "tangle of tickets" gets
resolved soon, though unfortunately I am not competent to try - just
competent enough to make a well-intentioned mistake, instead!

Thanks,
- kcrisman
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