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Re: Mathematica 8 remote parallel kernels

  • To: mathgroup at smc.vnet.net
  • Subject: [mg120611] Re: Mathematica 8 remote parallel kernels
  • From: Iván Pulido Sanchez <ijpulido.s at gmail.com>
  • Date: Sun, 31 Jul 2011 07:24:45 -0400 (EDT)
  • Delivered-to: l-mathgroup@mail-archive0.wolfram.com
  • References: <j0truv$d50$1@smc.vnet.net>

On Sat, Jul 30, 2011 at 5:00 AM, Oleksandr Rasputinov <
oleksandr_rasputinov at hmamail.com> wrote:

> Perhaps you are exceeding your quota of kernel licences? (Particularly
> likely on a shared server where others may or may not also be using some
> of the available licences at any given time.) Another possibility, if you
> are trying to launch a large number of parallel kernels, is that you are
> running into some kind of limitation on the number of concurrent TCP/IP
> connections.
>
> Other than that, it is likely platform-dependent, but you do not mention
> what platform you are using. Correctly setting up Windows
> client-to-Windows server parallel kernel operation is slightly more
> difficult than for the other platforms, for example.
>
>
Thanks for the ideas. And you are right I should've mentioned the OS it's
running on. It's Linux (Debian Squeeze to be exact).

I don't think it's a license issue since I can run on each node 4
Mathematica Kernels without problem, the problem is making them process in
parallel (meaning parallel remote kernels).

This used to work just fine with mathematica7 (Over 20 kernels without
problem, now I can't get more than 10 in the best case) no idea what could
have changed with mathematica8.

I've tried manually running the kernels with the ssh command that is shown
in the Parallel Kernel Configuration dialog without success (Link names
problems and such). If you could help me with this it would be very much
appreciated since this could lead to solve the problem.

Thanks again for your response.



> On Fri, 29 Jul 2011 09:45:19 +0100, Iv=E1n Pulido Sanchez
> <ijpulido.s at gmail.com> wrote:
>
> > Hello,
> >
> > When I try to configure remote kernels in Mathematica via
> > Evaluation>Parallel Kernel Configuration ... then I go to "Remote
> > Kernels"
> > and add hosts, after that I try to Launch the remote kernels and only =
>
> > some
> > of them get launched (the number of them varies),and finally I get a msg
> > like the following.
> >
> > KernelObject::rdead: Subkernel connected through remote[nodo2] appears
> > dead.
> >>> LinkConnect::linkc: Unable to connect to
> >>> LinkObject[36154 at 192.168.1.104,
> > 49648 at 192.168.1.104,38,12]. >> General::stop: Further output of
> > LinkConnect::linkc will be suppressed during this calculation. >>
> >
> > Any ideas how to get this working?
> >
> > Take into account it sometimes does load some of the remote kernels but
> > never all of them. Thanks in advance I hope you can help me with this.
>



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