[mvapich-discuss] [rsh] <defunct> ????

[Michael Li]

See my answers below.

Sayantan Sur wrote:
> Hello,
> 
> Thanks for contacting the group about this issue.
> 
> 
>>I have a 8-node cluster, when I start my application, I saw
>>many processes "[rsh] <defunct>", is this normal or I did
>>something wrong ?
> 
> 
> Can you please tell us if your application proceeds to completion?
yes.

> Normally, mpirun_rsh uses `ssh' to exec jobs, unless specifically told
> to use rsh (by using the -rsh flag). Do these "defunct" processes linger
> around or do they dissapear when the job finishes?  As far as I know,
I believe that "defunct" processes disappear when the job finishes.
My application normally takes long time, I did not pay much attention
to the "defunct" processes. When I kill my application, the "defunct"
processes disappear.

> there shouldn't be any "defunct" processes left behind. 
> 
> Do you see this behavior when using "ssh" too?
I always use rsh. The reason is that performance concern.
This raises another question : in general, should use rsh or ssh?
 From performance point of view, I believe that should use rsh.

I always manually change mpirun.vapi as follows:

  # org    $Show $MPIRUN_HOME/mpirun_rsh $via_args $progname $cmdLineArgs
     $Show $MPIRUN_HOME/mpirun_rsh -rsh $via_args $progname $cmdLineArgs

Can you explain why you choose ssh as default ?

> 
> 
>>I am using mvapich-0.9.5-119 and Mellanox IB Gold Distribution (IBGD) 
>>v1.7.0 for Linux.
> 
> 
> There is a much later version of IBGD (v1.8.1) which has several
> bugfixes. Does this problem happen with that version too?
I have not upgraded to 1.8.1 or 1.8.2 yet, because I am afraid of that
it may cause other unknown issues.

> 
> Thanks,
> Sayantan.
> 
> 

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