[Beowulf] PVM on wireless...

Robert G. Brown rgb at phy.duke.edu
Thu Feb 7 13:41:57 EST 2008


On Thu, 7 Feb 2008, Bill Rankin wrote:

> I think that I managed to replicate your problem, Rob.
>
> Laptop running CentoOS5, pvm 3.4.5-7(rpm), wireless ethernet.
> Server running FC6, pvm 3.4.5-7(rpm)
>
> Ssh working fine in both directions, PVM_ROOT and PVM_RSH set accordingly.

Try it with the firewalls completely down and I'll bet it works.

However, it is REALLY strange that it works with them UP for some
combinations.  Or not so strange -- that's what was fooling me, after
all.  Perhaps the port ranges being used are varying with version or
chance.

    rgb

>
> Running "pvm" from the shell on the server and doing an "add <laptop>" at the 
> prompt.
> Prompted for password.
> PVM then hangs waiting to add remote host.
> On the remote host, we see the pvmd running with a "ps".
>
> If I do nothing: the remote pvmd eventually dies and after that the command 
> prompt on the server returns with a "1 successful" message, but a "conf" 
> command shows that no hosts were added.
>
> Here is the weird part: if after I issue the "add <laptop>" command, I then 
> go over to the laptop and run "pvm" from a shell, the connection is made and 
> the hosts are successfully added.
>
> So you may want to try this and see if you get similar behavior.
>
>
> Last datapoint: if from my laptop I attempt to add a host that has PVM 3.4.4 
> (CentOS4 rpm) installed, it starts up fine.  So I think that it's a bug in 
> 3.4.5-7.  I haven't tried it over a wired connection yet.
>
> So you may want to try dropping back to version 3.4.4 on all machines and see 
> if that helps.
>
>
> Jim Kohl at ORNL seems to have several patches to 3.4.5, and I'm wondering if 
> this issue has already been addressed.
>
>
> -bill

-- 
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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