[Beowulf] PVM on wireless...

Peter St. John peter.st.john at gmail.com
Wed Feb 6 08:34:14 PST 2008


RGB,
Are you using 3.4.5 re "improved use on Beowulf..."? I was thinking along
the lines of the script invoking PVM doing something to reboot or refresh
the network, and saw "New features in PVM 3.4.x include communication
contexts...". I'd be happy to read a perl or Cish thing if an extra pair of
eyes might notice something, but I don't know where to start.
YMHS Peter

On Feb 6, 2008 10:40 AM, Robert G. Brown <rgb at phy.duke.edu> wrote:

> Anybody on list have any idea why PVM fails to add hosts over a wireless
> link?  I've now tried this over multiple distro version and at least one
> PVM update, and it just doesn't work.  Works fine over a wire, fails on
> wireless, and as far as I know wire and wireless are both "identical"
> at the kernel interface layer so that any e.g. socket one might open is
> absolutely ecumenical about what the underlying hardware is (good old
> ISO/OSI layering, right?).
>
> And yes, I'm well aware that from a latency/bw point of view this
> arrangement isn't going to be a speed demon or scale terribly well, but
> for testing PVM from a laptop or writing code from a laptop or just
> playing with PVM itself for fun or profit from a laptop it would
> certainly be lovely if it WORKED, however poorly as far as IPCs are
> concerned.
>
> Yup, tried it one last time.  Locks it right up it does, have to kill
> pvm[d] by hand and hand-remove the lockfiles, just like I did two or
> three years ago...
>
>    rgb
>
> --
> Robert G. Brown                            Phone(cell): 1-919-280-8443
> Duke University Physics Dept, Box 90305
> Durham, N.C. 27708-0305
> Web: http://www.phy.duke.edu/~rgb
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