On Wed, Oct 14, 2009 at 4:55 AM, Thierry Dumont
<tdum...@math.univ-lyon1.fr> wrote:
> 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)?
There is an abstract storage layer through which all storage requests
go. It has a well defined interface. There is currently *one*
implementation of it, which requires the local filesystem. However,
it could definitely be the case that we write another implementation
that uses a client/server architecture like you describe above.
> 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?
What do you mean by "the current notebook"?
william
>
> Yours, very sincerely
>
> t.d.
>
--
William Stein
Associate Professor of Mathematics
University of Washington
http://wstein.org
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