William Stein a écrit :
> Hi,
>
> Nearly two weeks ago I had the notebook stabilized and all known new
> bugs fixed (after separating it off from sage as a separate program
> and rewriting the expect stuff). But I realized that it would be a
> total nightmare to introduce yet another sobj ("sage object") storage
> format, which would make refactoring code extremely painful, and just
> have to be changed again. So, I created an "abstract storage layer"
> and implemented an storage system for *everything* in the Sage
> notebook which doesn't use any special Sage-related pickles. Some
> data is stored as pickled basic Python objects that can be read from
> any version of Python with or without Sage installed, but that is it.
> Rewriting the notebook to use an abstract storage layer is the sort
> of thing that at first seems like it will take a day, but then takes
> more than a week. Anyway, I did it. However, it's hard to imagine
> that I didn't introduce numerous new bugs in the process, though I do
> not know of any bugs at all.
>
>
Hi,
Good... I have two questions, one about this new notebook, and one about
the current notebook.
1) If we have an abstract storage layer, this should mean that we could
possibly store everything somewhere else, for example in a database on
an other virtual or physical machine. Yes? No? Then would this database
be shareable among different instances of Sage running on different
machines? I mean by this: the same user could connect on different sage
servers and find/create/manipulate the same objects (worksheets)?
2) With the current notebook. I tried the following experience: I have 2
machines (actually 3). On these machines there are unix users sage1,
sage2, ..., sage3...,sagen, with the same uid and same gid on both
machines. The home directories are shared by nfs. On machine 1, n/2
instances of sage run belonging to sage1,....sage_n/2, and on machine 2
there run instances of sage belonging to sage{n/2+1},.... sagen.
A hash of the user name associates the individual users with one unix
account and only one. Now suppose I want to stop machine 2. I launch
instances of sage belonging to sage{n/2+1},.... sagen on machine 1. I
recall that the home directory is the same for user sageX on machine 1
and 2. *BUT* now when I connect has user sagen on machine 1 (sagen
usually runs on machine 2), I cannot see the worksheets created on
machine 1. Can you explain me this?
Yours, very sincerely
t.d.
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