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<TITLE>RE: [mpich-discuss] mpiexec kills the remote login shell</TITLE>
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<P><FONT SIZE=2> Hi,<BR>
Does smpd abort when you run your MPI job ?<BR>
<BR>
Regards,<BR>
Jayesh<BR>
<BR>
-----Original Message-----<BR>
From: Yu-Cheng Chou [<A HREF="mailto:cycchou@ucdavis.edu">mailto:cycchou@ucdavis.edu</A>]<BR>
Sent: Wednesday, February 04, 2009 1:56 PM<BR>
To: Jayesh Krishna<BR>
Cc: mpich-discuss@mcs.anl.gov<BR>
Subject: Re: [mpich-discuss] mpiexec kills the remote login shell<BR>
<BR>
Hi<BR>
<BR>
I can cross-compile the program and then simply run the executable on Korebot with no errors.<BR>
<BR>
<BR>
> Hi,<BR>
> Can you try running (without mpiexec) a simple C program with<BR>
> exit(-1) on Korebot ?<BR>
><BR>
> ========================================<BR>
> #include <stdlib.h><BR>
> int main(int argc, char *argv[])<BR>
> {<BR>
> exit(-1);<BR>
> }<BR>
> ========================================<BR>
><BR>
> Regards,<BR>
> Jayesh<BR>
> ________________________________<BR>
> From: mpich-discuss-bounces@mcs.anl.gov<BR>
> [<A HREF="mailto:mpich-discuss-bounces@mcs.anl.gov">mailto:mpich-discuss-bounces@mcs.anl.gov</A>] On Behalf Of Jayesh Krishna<BR>
> Sent: Wednesday, February 04, 2009 1:04 PM<BR>
> To: 'Yu-Cheng Chou'<BR>
> Cc: mpich-discuss@mcs.anl.gov<BR>
> Subject: Re: [mpich-discuss] mpiexec kills the remote login shell<BR>
><BR>
> Hi,<BR>
> Can you also attach the corresponding smpd debug output ?<BR>
><BR>
> Regards,<BR>
> Jayesh<BR>
><BR>
> -----Original Message-----<BR>
> From: Yu-Cheng Chou [<A HREF="mailto:cycchou@ucdavis.edu">mailto:cycchou@ucdavis.edu</A>]<BR>
> Sent: Wednesday, February 04, 2009 1:02 PM<BR>
> To: Jayesh Krishna<BR>
> Cc: mpich-discuss@mcs.anl.gov<BR>
> Subject: Re: [mpich-discuss] mpiexec kills the remote login shell<BR>
><BR>
> Hi,<BR>
><BR>
> Firstly, the previously attached mpiexec verbose output is a wrong one.<BR>
> I've attached the correct one to this email.<BR>
><BR>
> Secondly, I want to point out that as long as mpiexec is initiated<BR>
> from Korebot to run a program, no matter it's a MPI or non-MPI<BR>
> program, no matter the program can be found or not, as soon as mpiexec<BR>
> is finished, the ssh connection to Korebot will be gone.<BR>
><BR>
> Thank you<BR>
><BR>
><BR>
>> Hi,<BR>
>> The mpiexec output shows the following error when running hellow,<BR>
>> ==================<BR>
>><BR>
>> Unable to exec 'hello' on korebot<BR>
>><BR>
>> Error 2 - No such file or directory<BR>
>><BR>
>> ==================<BR>
>><BR>
>> Please provide the debug output of smpd (smpd -d 2>&1 | tee<BR>
>> smpd.out) along with mpiexec (mpiexec -verbose -n 2 ./hellow 2>&1 |<BR>
>> tee mpiexec.out).<BR>
>><BR>
>> # Can you run simple C programs (without using mpiexec) on Korbet ?<BR>
>> # Is the ssh connection aborted when you run non-MPI programs<BR>
>> (mpiexec -n 2<BR>
>> hostname) ?<BR>
>> # Can you send us your ".smpd" config file ?<BR>
>> # Did you modify the MPICH2 code to run on Korbet (Please send us<BR>
>> your configure command & any env settings set to configure/make MPICH2)?<BR>
>><BR>
>> Regards,<BR>
>> Jayesh<BR>
>><BR>
>> ________________________________<BR>
>> From: mpich-discuss-bounces@mcs.anl.gov<BR>
>> [<A HREF="mailto:mpich-discuss-bounces@mcs.anl.gov">mailto:mpich-discuss-bounces@mcs.anl.gov</A>] On Behalf Of Jayesh<BR>
>> Krishna<BR>
>> Sent: Wednesday, February 04, 2009 8:41 AM<BR>
>> To: 'Yu-Cheng Chou'<BR>
>> Cc: mpich-discuss@mcs.anl.gov<BR>
>> Subject: Re: [mpich-discuss] mpiexec kills the remote login shell<BR>
>><BR>
>> Hi,<BR>
>> I will take a look at the debug logs and get back to you.<BR>
>> Meanwhile, can you run simple C programs without using mpiexec on Korbet ?<BR>
>> MPICH2 currently does not support heterogeneous systems (So you<BR>
>> won't be able to run your MPI job across ARM & other architectures).<BR>
>><BR>
>> Regards,<BR>
>> Jayesh<BR>
>><BR>
>> -----Original Message-----<BR>
>> From: Yu-Cheng Chou [<A HREF="mailto:cycchou@ucdavis.edu">mailto:cycchou@ucdavis.edu</A>]<BR>
>> Sent: Tuesday, February 03, 2009 7:52 PM<BR>
>> To: Jayesh Krishna<BR>
>> Cc: mpich-discuss@mcs.anl.gov<BR>
>> Subject: Re: [mpich-discuss] mpiexec kills the remote login shell<BR>
>><BR>
>>> # Can you run non-MPI programs using mpiexec (mpiexec -n 2 hostname) ?<BR>
>> Yes.<BR>
>><BR>
>>> # Can you compile and run the hello world program<BR>
>>> (examples/hellow.c) provided with MPICH2 (mpiexec -n 2 ./hellow)?<BR>
>> Yes.<BR>
>><BR>
>>> # How did you start smpd (the command used to start smpd) ? How did<BR>
>>> you run your MPI job (the command used to run your job)?<BR>
>> I have a ".smpd" file containing one line of information, which is<BR>
>> "phrase=123".<BR>
>> Thus, I started smpd using "smpd -s".<BR>
>> Then I used "mpiexec -n 1 hellow" to run hellow on Korebot.<BR>
>><BR>
>>> # How did you find that mpiexec kills the sshd process (We typically<BR>
>>> ssh to unix machines and run mpiexec without any problems) ?<BR>
>> I logged in Korebot with two terminals.<BR>
>> >From #1 terminal, I checked all the processes running on Korebot.<BR>
>> >From #2 terminal, I started smpd and run hellow using the commands<BR>
>> mentioned above.<BR>
>> After hellow was finished, the connection to Korebot via #2 terminal<BR>
>> was closed.<BR>
>> >From #1 terminal, I knew that the sshd process associated with #2<BR>
>> >terminal<BR>
>> was gone.<BR>
>><BR>
>>> Can you run smpd/mpiexec in debug mode and provide us with the<BR>
>>> outputs (smpd -d / mpiexec -n 2 -verbose hostname) ?<BR>
>> The first attached text file is the output from running hellow in<BR>
>> mpiexec's verbose mode.<BR>
>><BR>
>><BR>
>> There is another issue.<BR>
>> This time, I used two machines. One is Korebot as mentioned above,<BR>
>> and the other is a laptop running Ubuntu Linux OS.<BR>
>> I started smpd with the same ".smpd" file and command as mentioned<BR>
>> above both on Korebot and the lap top.<BR>
>> There is a machine file called "hostfile" on Korebot. The file<BR>
>> contains the following information about the name of the two machines.<BR>
>><BR>
>> korebot<BR>
>> shrimp<BR>
>><BR>
>> Then from Korebot, I ran cpi using the following command.<BR>
>><BR>
>> mpiexec -machinefile ./hostfile -verbose -n 2 cpi<BR>
>><BR>
>><BR>
>> But the value of pi is a huge number. I think it is related to<BR>
>> "double type variables" being transferred between processes running<BR>
>> on an ARM-based Linux and a general Linux machines.<BR>
>><BR>
>> The second attached text file is the output from running cpi in<BR>
>> mpiexec's verbose mode.<BR>
>><BR>
>><BR>
>>><BR>
>>> I am cross-compiling mpich2-1.0.8 with smpd for Khepera III mobile robot.<BR>
>>><BR>
>>> This mobile robot has a Korebot board which is an ARM-based computer<BR>
>>> with a Linux operating system.<BR>
>>><BR>
>>> The cross-compilation was fine.<BR>
>>><BR>
>>> Firstly, I logged in to Korebot through ssh.<BR>
>>> Secondly, I started smpd.<BR>
>>> Thirdly, I ran mpiexec to execute an MPI program (cpi) that comes<BR>
>>> with the package.<BR>
>>><BR>
>>> The result was correct, but when mpiexec was finished, the ssh<BR>
>>> connection to the Korebot was closed.<BR>
>>> I found that mpiexec kills the sshd process through which I was<BR>
>>> remotely connected to Korebot.<BR>
>>><BR>
>>> I've been looking for the cause, but still have not found any clues.<BR>
>>><BR>
>>> Could you give me any ideas to solve this problem?<BR>
>>><BR>
>>> Thank you,<BR>
>>><BR>
>>> Yu-Cheng<BR>
>>><BR>
>><BR>
><BR>
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