On Sep 16, 9:37 pm, "William Stein" <[EMAIL PROTECTED]> wrote:
> On Tue, Sep 16, 2008 at 12:16 PM, Yann Le Du <[EMAIL PROTECTED]> wrote:
>
>
>
> > Hello,
>
> > I tried to email the person apprently responsible for dsage, Yi Qiang,
> > about this, to no avail, so I turn to the list.
>
> > I use sage, v. 3.1.1, and am trying to build an application (Monte Carlo
> > stuff) and use dsage to parallelize the code : very easy stuff, just do a
> > series of jobs, done normally in sequence on a single computer, in
> > parallel on many.
>
> Is it a bunch of computers all over on a network? Just curious what sort
> of "many computers" you have at your disposal.
>
Yes, many computers over a network, some dual and some quad cores,
with all
cores of nearly equal power.
>
> > So I fiddled around with dsage, managed to understand the basics, and I
> > find it very good, yet I have a few questions/remarks :
>
> > 1/ Why isn't there a clear, publicized, illustrated description of how to
> > use dsage ? I managed to make it work, but only after googling hard.
>
> > 2/ How can I send a job to a worker that will output intermediate values ?
> > I mean, say the job sent to a particular worker computes some value, and
> > that it takes 100 iterations, how can I output temporary values every 10
> > iterations and have the server report those intermediate values ?
>
> > 3/ I noticed that workers can connect any time, really, and receive jobs
> > even if they connect to the server only after the server started some
> > sequence of jobs, which is cool. But I also noticed that if a worker gets
> > killed, then its job gets lost. Isn't it possible for the server to check
> > if a worker is alive, every once in a while, and if not requeue its job ?
>
> > 4/ What is the function I can use to check which worker did what, and if
> > it's alive, and what job got interrupted.
>
> > 5/ What test can I apply to a dsage job to see if it's finished ? Say a
> > job outputs a list, and I want to plot it, can I say something like "If
> > there is some output, plot it, otherwise wait." ?
>
> > 6/ If you have any notes, drafts, illustrating some of dsage
> > functionalities, I'd be more than happy to check them out.
>
> > Cheers,
>
> > --
> > Yann Le Du
>
> --
> William Stein
> Associate Professor of Mathematics
> University of Washingtonhttp://wstein.org
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