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running PitzDaily parallel

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Old   September 24, 2021, 07:42
Default running PitzDaily parallel
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qutadah
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Hi everyone i am running pitzDaily tutorial on my universities Workstation and i am using scotch method with 4 processors. I have decomposed the mesh and have the folders for the processors, however when i run the simulation following error occurs...


I am using OpenFoam 6 version....


here are my cpu specs running lscpu command


rababqjt@ws18:/storage/rababqjt/tutorials/incompressible/simpleFoam/pitzDaily/system> lscpu
Architecture: x86_64
CPU op-mode(s): 32-bit, 64-bit
Byte Order: Little Endian
Address sizes: 39 bits physical, 48 bits virtual
CPU(s): 8
On-line CPU(s) list: 0-7
Thread(s) per core: 2
Core(s) per socket: 4
Socket(s): 1
NUMA node(s): 1
Vendor ID: GenuineIntel
CPU family: 6
Model: 60
Model name: Intel(R) Xeon(R) CPU E3-1271 v3 @ 3.60GHz
Stepping: 3
CPU MHz: 3592.177
CPU max MHz: 4000.0000
CPU min MHz: 800.0000
BogoMIPS: 7183.95
Virtualization: VT-x
L1d cache: 32K
L1i cache: 32K
L2 cache: 256K
L3 cache: 8192K
NUMA node0 CPU(s): 0-7



Can anyone help me?


Terminal:

"""

rababqjt@ws18:/storage/rababqjt/tutorials/incompressible/simpleFoam/pitzDaily> simpleFoam -parallel
--------------------------------------------------------------------------
[[24535,1],0]: A high-performance Open MPI point-to-point messaging module
was unable to find any relevant network interfaces:

Module: OpenFabrics (openib)
Host: ws18

Another transport will be used instead, although this may result in
lower performance.

NOTE: You can disable this warning by setting the MCA parameter
btl_base_warn_component_unused to 0.
--------------------------------------------------------------------------


--> FOAM FATAL ERROR:
bool IPstream::init(int& argc, char**& argv) : attempt to run parallel on 1 processor

From function static bool Foam::UPstream::init(int&, char**&, bool)
in file UPstream.C at line 112.

FOAM aborting

#0 Foam::error:rintStack(Foam::Ostream&) at ??:?
#1 Foam::error::abort() at ??:?
#2 Foam::UPstream::init(int&, char**&, bool) at ??:?
#3 Foam::argList::argList(int&, char**&, bool, bool, bool) at ??:?
#4 ? at ??:?
#5 __libc_start_main in "/lib64/libc.so.6"
#6 ? at /home/abuild/rpmbuild/BUILD/glibc-2.27/csu/../sysdeps/x86_64/start.S:122
[ws18:14780] *** Process received signal ***
[ws18:14780] Signal: Aborted (6)
[ws18:14780] Signal code: (-6)
[ws18:14780] [ 0] /lib64/libc.so.6(+0x394a0)[0x7f2d620c54a0]
[ws18:14780] [ 1] /lib64/libc.so.6(gsignal+0x110)[0x7f2d620c5420]
[ws18:14780] [ 2] /lib64/libc.so.6(abort+0x151)[0x7f2d620c6a01]
[ws18:14780] [ 3] /opt/net/OpenFOAM/OpenFOAM-6/platforms/linux64GccDPInt32Opt/lib/libOpenFOAM.so(_ZN4Foam5error5abortEv+0x116)[0x7f2d6328d326]
[ws18:14780] [ 4] /opt/net/OpenFOAM/OpenFOAM-6/platforms/linux64GccDPInt32Opt/lib/openmpi-system/libPstream.so(_ZN4Foam8UPstream4initERiRPPcb+0x3cc )[0x7f2d61e8221c]
[ws18:14780] [ 5] /opt/net/OpenFOAM/OpenFOAM-6/platforms/linux64GccDPInt32Opt/lib/libOpenFOAM.so(_ZN4Foam7argListC1ERiRPPcbbb+0x7e7)[0x7f2d632b3927]
[ws18:14780] [ 6] simpleFoam[0x4261e4]
[ws18:14780] [ 7] /lib64/libc.so.6(__libc_start_main+0xea)[0x7f2d620b034a]
[ws18:14780] [ 8] simpleFoam[0x429c2a]
[ws18:14780] *** End of error message ***
Aborted (core dumped)

"""


Thanks!
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Old   September 25, 2021, 20:21
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Erick D. Martinez
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With OpenFOAM you have to run the solver using mpirun

In your case with 4 processors using simpleFoam it would be:

mpirun -np 4 simpleFoam -parallel

Test that out!
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Old   September 27, 2021, 05:43
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Quote:
Originally Posted by erickmartinez View Post
With OpenFOAM you have to run the solver using mpirun

In your case with 4 processors using simpleFoam it would be:

mpirun -np 4 simpleFoam -parallel

Test that out!
Why would i need an mpi? Or the better question „when do i need an mpi“ i ran alot of parallel simulations without mpi on my laptop. This is the universities workstation (pc).. thanks!
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Old   September 27, 2021, 05:47
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OpenFOAM in parallel works using OpenMPI. I have used the mpirun to run parallel jobs for all my simulations in the past years. Unless anybody else has any other idea, but as far as I know you always start parallel jobs with mpirun
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Old   September 27, 2021, 06:30
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i believe I had made a mistake thinking when i decompose and just run simple command it will just solve it parallely without any extra command !


Thanks alot it works now!
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