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Issue with Running MPI program on Intel devcloud

Garvita
Beginner
2,526 Views

I am running MPI sample program on intel devcloud cluster. It is running fine when executing on single node but facing trouble to use multi node cluster environment. Please suggest.

 

Number of processes is specified as 4 while running program with mpirun, expected rank information (rank 0,1,2, and 3) is coming on single node but on multinode only 2 processes are executed and also the rank information is incorrect.

 

- Execution on Single compute Node: 

u171596@s001-n004:~/OneAPI_Project/intel_ci/mpiTest$ mpiicpc -cxx=dpcpp -fsycl mpiTest.cpp -o hello_mpi_dpcpp

 

u171596@s001-n004:~/OneAPI_Project/intel_ci/mpiTest$ cat mpiTest.cpp
#include <mpi.h>
#include<iostream>
#include<sched.h>
using namespace std;
int main(int argc, char** argv){
MPI_Init(NULL, NULL);
int rank;
int world;
MPI_Comm_rank(MPI_COMM_WORLD, &rank);
MPI_Comm_size(MPI_COMM_WORLD, &world);
cout<<"Core "<<sched_getcpu()<<endl;
cout<<"Hello rank: "<<rank<< " world: "<<world<<"\n";
MPI_Finalize();
}

 

 

u171596@s001-n004:~/OneAPI_Project/intel_ci/mpiTest$ mpirun -n 4 ./hello_mpi_dpcpp
Hello world from host s001-n004 core 21 (rank 3)!
Hello world from host s001-n004 core 6 (rank 0)!
Hello world from host s001-n004 core 11 (rank 1)!
Hello world from host s001-n004 core 19 (rank 2)!

 

 

- Execution on multi Node Cluster using qsub utility:

u171596@login-2:~/OneAPI_Project/intel_ci/mpiTest$ cat distrjob2.sh
#PBS -l nodes=2:ppn=2
cd $PBS_O_WORKDIR
echo Launching the parallel job from mother superior `hostname`...
echo $PBS_NODEFILE
cat $PBS_NODEFILE
mpirun -machinefile $PBS_NODEFILE ./hello_mpi_dpcpp

 

u171596@login-2:~/OneAPI_Project/intel_ci/mpiTest$ qsub -l nodes=2:gpu:ppn=2 -d . distrjob2.sh


2107279.v-qsvr-1.aidevcloud

u171596@login-2:~/OneAPI_Project/intel_ci/mpiTest$ cat distrjob2.sh.o2107279

########################################################################
#      Date:           Tue 27 Dec 2022 08:19:26 PM PST
#    Job ID:           2107279.v-qsvr-1.aidevcloud
#      User:           u171596
# Resources:           cput=75:00:00,neednodes=2:gpu:ppn=2,nodes=2:gpu:ppn=2,walltime=06:00:00
########################################################################

Launching the parallel job from mother superior s019-n015...
/var/spool/torque/aux//2107279.v-qsvr-1.aidevcloud
s019-n015
s019-n015
s019-n016
s019-n016

..........................

:: oneAPI environment initialized ::
 
Hello world from host s019-n016 core 7 (rank 0)!
Hello world from host s019-n016 core 0 (rank 0)!

 

Error file : $ cat distrjob2.sh.e2107279

./hello_mpi_dpcpp: error while loading shared libraries: libsycl.so.6: cannot open shared object file: No such file or directory
--------------------------------------------------------------------------
Primary job terminated normally, but 1 process returned
a non-zero exit code. Per user-direction, the job has been aborted.
--------------------------------------------------------------------------
./hello_mpi_dpcpp: error while loading shared libraries: libsycl.so.6: cannot open shared object file: No such file or directory
--------------------------------------------------------------------------
mpirun detected that one or more processes exited with non-zero status, thus causing
the job to be terminated. The first process to do so was:

Process name: [[2486,1],1]
Exit code: 127

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11 Replies
VarshaS_Intel
Moderator
2,498 Views

Hi,

 

Thanks for posting in Intel Communities and thanks for providing the details.

 

We have followed all the steps mentioned by you. But, we are able to get the expected results without any errors. For more details, please find the below screenshots(single and multi-node):

VarshaS_Intel_0-1672330278203.png

VarshaS_Intel_1-1672330301561.png

 

And also, could you please try re-running once again on multi-node by following these steps:

 

1) Could you please try changing the below line in the file distrjob2.sh(in order to check whether it is only on a particular node):

 

replace 
#PBS -l nodes=2:ppn=2 
it with 
#PBS -l nodes=s019-n004+s019-n007:ppn=2

 

2) Next, run this command:

qsub distrjob2.sh

 

3) Then, the files will be generated. Do provide us with the results of both the error and output files. We have tried it with the nodes(s019-n015
s019-n016) but we are able to get the correct results.

 

Please do let us know if you are still facing the same error.

 

Thanks & Regards,

Varsha

 

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Garvita
Beginner
2,465 Views

Thank you for your reply.

I am still facing the same issue.  Updated distrijob2.sh error and output files are pasted below.

----------------------------------------------------------------------------------------------------------

u171596@s001-n007:~/OneAPI_Project/intel_ci/mpiTest$ cat distrjob2.sh
#PBS -l nodes=s019-n004+s019-n007:ppn=2
cd $PBS_O_WORKDIR
echo Launching the parallel job from mother superior `hostname`...
echo $PBS_NODEFILE
cat $PBS_NODEFILE
mpirun -machinefile $PBS_NODEFILE ./hello_mpi_dpcpp

-------------------------------------------------------------------------------------------------------------
u171596@login-2:~$ cat OneAPI_Project/intel_ci/mpiTest/distrjob2.sh.o2112895

########################################################################
#      Date:           Mon 02 Jan 2023 11:02:45 PM PST
#    Job ID:           2112895.v-qsvr-1.aidevcloud
#      User:           u171596
# Resources:           cput=75:00:00,neednodes=s019-n004+s019-n007:ppn=2,nodes=s019-n004+s019-n007:ppn=2,walltime=06:00:00
########################################################################

Launching the parallel job from mother superior s019-n004...
/var/spool/torque/aux//2112895.v-qsvr-1.aidevcloud
s019-n004
s019-n007
s019-n007
 
:: initializing oneAPI environment ...
   bash: BASH_VERSION = 5.0.17(1)-release
   args: Using "$@" for setvars.sh arguments:
:: advisor -- latest
:: ccl -- latest
:: clck -- latest
:: compiler -- latest
:: dal -- latest
:: debugger -- latest
:: dev-utilities -- latest
:: dnnl -- latest
:: dpcpp-ct -- latest
:: dpl -- latest
:: embree -- latest
:: inspector -- latest
:: intelpython -- latest
:: ipp -- latest
:: ippcp -- latest
:: ipp -- latest
:: ispc -- latest
:: itac -- latest
:: mkl -- latest
:: modelzoo -- latest
:: modin -- latest
:: mpi -- latest
:: neural-compressor -- latest
:: oidn -- latest
:: openvkl -- latest
:: ospray -- latest
:: ospray_studio -- latest
:: pytorch -- latest
:: rkcommon -- latest
:: rkutil -- latest
:: tbb -- latest
:: tensorflow -- latest
:: vpl -- latest
:: vtune -- latest
:: oneAPI environment initialized ::
 
Core 0
Hello rank: 0 world: 1
Core 3
Hello rank: 0 world: 1

########################################################################
# End of output for job 2112895.v-qsvr-1.aidevcloud
# Date: Mon 02 Jan 2023 11:02:50 PM PST

########################################################################

 

---------------------------------------------------------------------------------------------------------------

u171596@login-2:~$ cat OneAPI_Project/intel_ci/mpiTest/distrjob2.sh.e2112895
./hello_mpi_dpcpp: error while loading shared libraries: libsycl.so.6: cannot open shared object file: No such file or directory
--------------------------------------------------------------------------
Primary job  terminated normally, but 1 process returned
a non-zero exit code. Per user-direction, the job has been aborted.
--------------------------------------------------------------------------
./hello_mpi_dpcpp: error while loading shared libraries: libsycl.so.6: cannot open shared object file: No such file or directory
./hello_mpi_dpcpp: error while loading shared libraries: libsycl.so.6: cannot open shared object file: No such file or directory
./hello_mpi_dpcpp: error while loading shared libraries: libsycl.so.6: cannot open shared object file: No such file or directory
./hello_mpi_dpcpp: error while loading shared libraries: libsycl.so.6: cannot open shared object file: No such file or directory
./hello_mpi_dpcpp: error while loading shared libraries: libsycl.so.6: cannot open shared object file: No such file or directory
./hello_mpi_dpcpp: error while loading shared libraries: libsycl.so.6: cannot open shared object file: No such file or directory
./hello_mpi_dpcpp: error while loading shared libraries: libsycl.so.6: cannot open shared object file: No such file or directory
--------------------------------------------------------------------------
mpirun detected that one or more processes exited with non-zero status, thus causing
the job to be terminated. The first process to do so was:

  Process name: [[15378,1],3]
  Exit code:    127
--------------------------------------------------------------------------

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Garvita
Beginner
2,413 Views

@VarshaS_Intel Could you please help to resolve the issue.

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JaideepK_Intel
Moderator
2,402 Views

Hi,


Sorry for the delay, we are unable to reproduce your issue from our end. We informed the concern team, and we will get back to you with an update.


Thanks,

Jaideep


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JaideepK_Intel
Moderator
2,375 Views

Hi,


This is an account-specific issue, and the concerned team advised creating a new account and trying the same thing. If the issue still persists, please let us know.


Thanks,

Jaideep


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Garvita
Beginner
2,325 Views

Thank you Jaideep.

It is working with different account. 

Need one more information please. I am only able to use 2 nodes to execute the MPI program. for anything more,  it is giving "Resource Limitation" error. Is there any way I can use more than 2 nodes to execute the program?

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JaideepK_Intel
Moderator
2,310 Views

Hi,


In Devcloud, each user can access a maximum of two nodes, i.e., four processes per node.

There is no other way to access more than 2 nodes.


If this resolves your issue, make sure to accept this as a solution. This would help others with similar issue. Thank you!


Thanks,

Jaideep



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Garvita
Beginner
2,295 Views

Thank You Jaideep

I tried with 4 processes per node. It seems only 2 are permissible. Please confirm.

 

Garvita_1-1674018473077.png

 

 

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JaideepK_Intel
Moderator
2,287 Views

Hi,

 

Could you please try the above workaround suggested by @VarshaS_Intel ?

We were able to run with the above workaround.

 

Note (Work around 2):

>>In DevCloud, we can run a maximum of 2 nodes, and on each node we can run 2 processes (total of 4 processes).

Please follow the below steps:

Connect to the DevCloud via Cygwin using below command:

 

qsub -I -l nodes=<number_of_nodes>:<property>:ppn=2 -d .

 

example: qsub -I -l nodes=2:gpu:ppn=2 -d .

After logging into the compute node, we need to get the node numbers which we accessed. So run the below command.

 

echo $PBS_NODEFILE (example output looks like this: /var/spool/torque/aux//1955007.v-qsvr-1.aidevcloud)

 

We need to cat the output of $PBS_NODEFILE

example:

 

cat /var/spool/torque/aux//1955007.v-qsvr-1.aidevcloud
s001-n141
s001-n141
s001-n157
s001-n157

 

Copy the node numbers from above and paste them into the host file (I pasted the above node numbers into host.txt)

After pasting the node numbers into the host file, we can run the mpirun command. (Since I am running the mpi4py script, I gave the python command in the below command.)

 

mpirun -n 4 -hostfile host.txt ./test

 

JaideepK_Intel_0-1674048432400.png

 

If this resolves your issue, make sure to accept @VarshaS_Intel workaround as a solution. This would help others with a similar issue. Thank you!

 

Thanks,

Jaideep

 

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JaideepK_Intel
Moderator
2,159 Views

Hi,


If this resolves your issue, make sure to accept this as a solution. This would help others with similar issue. Thank you!


Regards,

Jaideep


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JaideepK_Intel
Moderator
2,109 Views

Hi,

 

We assume that your issue is resolved. If you need any additional information, please post a new question as this thread will no longer be monitored by Intel.

 

Thanks,

Jaideep

 

 

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