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Old   June 14, 2015, 03:38
Default parallel Simulation fail
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daniel
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Hello

I am currently trying to run a parallel simulation on 2 quadcore nodes.
Both have OF installed on them both are available on network (one is dhcp server).
I set up the case on the main node with decomposePar for 8 cpu's.
I then run

mpirun -hostfile Machines -np 8 icoFoam -parallel

it then asks me for the second node password and then it runs (sort of) terminal puts out the following:

/*---------------------------------------------------------------------------*\
| ========= | |
| \\ / F ield | OpenFOAM: The Open Source CFD Toolbox |
| \\ / O peration | Version: 2.4.0 |
| \\ / A nd | Web: www.OpenFOAM.org |
| \\/ M anipulation | |
\*---------------------------------------------------------------------------*/
Build : 2.4.0-dcea1e13ff76
Exec : icoFoam -parallel
Date : Jun 14 2015
Time : 06:48:14
Host : "Node1"
PID : 5762


Thats all I get all 8 CPU's are on 100% and stay that way it never ends even if i set up a simulation that should only take a few seconds. Any one got any ideas why or how to fix this ?
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Old   June 14, 2015, 06:40
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Update

I just attempted the simulation again while monitoring both nodes.
when i start the simulation both nodes have 4 instances of icoFoam running each core at 100%.
But again it just does this indefinitely, even for a really small simulation
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Old   June 26, 2015, 15:25
Default Update 2
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daniel
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Well i maneged to solve the previous error , the problem was the ssh key.

Now i have found a new error when i run the same case, the openmpi seems to initialise and opens 4 instances of icoFoam on each node but the it crashes and gives out the following error

/*---------------------------------------------------------------------------*\
| ========= | |
| \\ / F ield | OpenFOAM: The Open Source CFD Toolbox |
| \\ / O peration | Version: 2.4.0 |
| \\ / A nd | Web: www.OpenFOAM.org |
| \\/ M anipulation | |
\*---------------------------------------------------------------------------*/
Build : 2.4.0-dcea1e13ff76
Exec : icoFoam -parallel
Date : Jun 26 2015
Time : 18:44:41
Host : "Master"
PID : 9870
Case : /home/pi/Desktop/cavity
nProcs : 8
Slaves :
7
(
"Master.9871"
"Master.9872"
"Master.9873"
"Slave1.8215"
"Slave1.8216"
"Slave1.8217"
"Slave1.8218"
)

Pstream initialized with:
floatTransfer : 0
nProcsSimpleSum : 0
commsType : nonBlocking
polling iterations : 0
sigFpe : Enabling floating point exception trapping (FOAM_SIGFPE).
fileModificationChecking : Monitoring run-time modified files using timeStampMaster
allowSystemOperations : Allowing user-supplied system call operations

// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
Create time

Create mesh for time = 0
[4]
[4]
[4] --> FOAM FATAL ERROR:
[4] Cannot find file "points" in directory "polyMesh" in times 0 down to constant
[4]
[4] From function Time::findInstance(const fileName&, const word&, const IOobject::readOption, const word&)[6]
[6]
[6] --> FOAM FATAL ERROR:
[6] Cannot find file "points" in directory "polyMesh" in times 0 down to constant
[6]
[6] From function Time::findInstance(const fileName&, const word&, const IOobject::readOption, const word&)
[6] in file db/Time/findInstance.C at line 203.
[6]
FOAM parallel run exiting
[6]
--------------------------------------------------------------------------
MPI_ABORT was invoked on rank 7 in communicator MPI_COMM_WORLD
with errorcode 1.

NOTE: invoking MPI_ABORT causes Open MPI to kill all MPI processes.
You may or may not see output from other processes, depending on
exactly when Open MPI kills them.
--------------------------------------------------------------------------
[7]
[7]
[7] --> FOAM FATAL ERROR:
[7] Cannot find file "points" in directory "polyMesh" in times 0 down to constant
[7]
[7] From function Time::findInstance(const fileName&, const word&, const IOobject::readOption, const word&)
[7] in file db/Time/findInstance.C at line 203.
[7]
FOAM parallel run exiting
[7]

[4] in file db/Time/findInstance.C at line 203.
[4]
FOAM parallel run exiting
[4]
[5]
[5]
[5] --> FOAM FATAL ERROR:
[5] Cannot find file "points" in directory "polyMesh" in times 0 down to constant
[5]
[5] From function Time::findInstance(const fileName&, const word&, const IOobject::readOption, const word&)
[5] in file db/Time/findInstance.C at line 203.

[5]
FOAM parallel run exiting
[5]
--------------------------------------------------------------------------
mpirun has exited due to process rank 4 with PID 8215 on
node 192.168.0.51 exiting without calling "finalize". This may
have caused other processes in the application to be
terminated by signals sent by mpirun (as reported here).
--------------------------------------------------------------------------
[Master:09866] 3 more processes have sent help message help-mpi-api.txt / mpi-abort
[Master:09866] Set MCA parameter "orte_base_help_aggregate" to 0 to see all help / error messages



Any one encountered this error before or knows how to fix it ?
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Old   December 16, 2015, 17:11
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nasir musa yakubu
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I have the same issue as posted on this thread:

http://www.cfd-online.com/Forums/ope...tml#post577812

i hope someone has a solutions to this problem

thanks

nas
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Old   December 17, 2015, 05:34
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Quote:
Originally Posted by esujby View Post
I have the same issue as posted on this thread:

http://www.cfd-online.com/Forums/ope...tml#post577812

i hope someone has a solutions to this problem

thanks

nas
I have solved this issue, in my case i did not have a file sharing system set up so the nodes could not access the case directory.
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Old   December 17, 2015, 09:11
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nasir musa yakubu
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Hello Daniel, thanks for your prompt reply, however i am a salome newbie, please what do you mean by a file sharing system? u didn't use the path of the case directory when exporting the mesh?

thanks
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Old   December 17, 2015, 10:00
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Quote:
Originally Posted by esujby View Post
Hello Daniel, thanks for your prompt reply, however i am a salome newbie, please what do you mean by a file sharing system? u didn't use the path of the case directory when exporting the mesh?

thanks
I think we are talking about two different issues here are you running the simulation on one machine ? , if so i dont have an answer for you I am not familiar with salome.
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