On Tue, Oct 14, 2008 at 6:36 AM, kcrisman <[EMAIL PROTECTED]> wrote:
>
>>
>> kcrisman,
>>
>> This was discussed recently. Several people said that if you start
>> several Sage notebooks on the same machine or virtual machine, but
>> different ports, things can scale up. It's having too many people on
>> the same sage notebook that seems to be the problem. We aren't sure
>> what the bottleneck is; someone needs to do some profiling to find out
>> where it is.
>
> I am aware of the thread you are referring to; I am referring to
> something different, at least I believe so!
>
>> How much memory do you allocate to the virtual server? Are you sure
>> that all the memory is being used up?
>>
>
> My sysadmin says probably 512 MB.
That is not enough. Could you allocate, say... 4GB instead?
> Yes, swap space is completely full
> and main memory is very close to full. The machine does not halt -
> you can usually still log in. His point of view is that the current
> issue is not networking-related, but rather that the various notebooks
> opening up are creating so many processes that the system is
> overtaxed.
He is probably right.
>
> What I am wondering is if anyone knows how quickly a) multiple logins
> to a notebook might do that or b) interact processes might do that (do
> the objects get cached, for instance?) or c) people forgetting to log
> out and perhaps leaving a notebook running might do that
c) could easily. Did you set the timeout parameter for the server?
timeout -- (default: 0) seconds until idle worksheet sessions
automatically timeout, i.e., the corresponding
Sage session terminates. 0 means 'never timeout'.
Also, you can limit memory usage for individual projects.
> or d)
> something else I can't think of might do that. Sysadmin knows about
> VMs but not so much about internals of Sage, so he isn't sure if it's
> simply people logging in and then not logging out while the notebook
> is still active, or if it could be something else.
>
> I understand that to some extent there is a lot of uncertainty as to
> how efficiently the notebook works, but I know so little about how it
> works (and about interact) that I'm asking the stupid questions, in
> case one of them turns out to have part of the answer.
They are not dumb, and it is very interesting thinking about a
concrete example of the notebook being used in a constrained environment.
William
--
William Stein
Associate Professor of Mathematics
University of Washington
http://wstein.org
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