|
[Sponsors] |
Using several nodes in a simulation (OpenFOAM) |
|
LinkBack | Thread Tools | Search this Thread | Display Modes |
December 2, 2019, 04:35 |
Using several nodes in a simulation (OpenFOAM)
|
#1 |
New Member
Join Date: Aug 2019
Posts: 19
Rep Power: 7 |
Dear all,
I'm quite new in using OpenFOAM in a cluster, using only one node is a breeze... the problem starts when I need to use more than one node... I'm using the command 'mpirun --host node1,node2 -np 48 rhoSimpleFoam -parallel' and I get the following info/error There are not enough slots available in the system to satisfy the 48 slots that were requested by the application: rhoSimpleFoam Either request fewer slots for your application, or make more slots available for use. A "slot" is the Open MPI term for an allocatable unit where we can launch a process. The number of slots available are defined by the environment in which Open MPI processes are run: 1. Hostfile, via "slots=N" clauses (N defaults to number of processor cores if not provided) 2. The --host command line parameter, via a ":N" suffix on the hostname (N defaults to 1 if not provided) 3. Resource manager (e.g., SLURM, PBS/Torque, LSF, etc.) 4. If none of a hostfile, the --host command line parameter, or an RM is present, Open MPI defaults to the number of processor cores In all the above cases, if you want Open MPI to default to the number of hardware threads instead of the number of processor cores, use the --use-hwthread-cpus option. Alternatively, you can use the --oversubscribe option to ignore the number of available slots when deciding the number of processes to launch. I'm doing something wrong, please help... OpenFOAM - v1906 |
|
February 19, 2020, 13:52 |
|
#2 |
Senior Member
alberto
Join Date: Apr 2016
Location: Mexico
Posts: 119
Rep Power: 10 |
Did you find what was going wrong?
I am trying to simulate in a cluster but I dont have idea how to start |
|
February 19, 2020, 17:44 |
|
#3 |
Senior Member
Herpes Free Engineer
Join Date: Sep 2019
Location: The Home Under The Ground with the Lost Boys
Posts: 931
Rep Power: 13 |
This had nothing to with OF.
I strongly suggest not to rush running big cases in a supercomputer to avoid wasting money (of taxpayers). Learn 5w1h of the cluster, follow the tutorials, start with the simplest case, and build up from there.
__________________
The OpenFOAM community is the biggest contributor to OpenFOAM: User guide/Wiki-1/Wiki-2/Code guide/Code Wiki/Journal Nilsson/Guerrero/Holzinger/Holzmann/Nagy/Santos/Nozaki/Jasak/Primer Governance Bugs/Features: OpenFOAM (ESI-OpenCFD-Trademark) Bugs/Features: FOAM-Extend (Wikki-FSB) Bugs: OpenFOAM.org How to create a MWE New: Forkable OpenFOAM mirror |
|
February 20, 2020, 03:29 |
|
#4 |
Senior Member
Yann
Join Date: Apr 2012
Location: France
Posts: 1,171
Rep Power: 27 |
Hello Didu,
As HPE said, your problem is not related to OpenFOAM but to openmpi. It would be useful to know which openmpi version you are using. I think you just need to specify how many processes you want to run on each node. Try using this syntax: Code:
mpirun --host node1:24,node2:24 -np 48 rhoSimpleFoam -parallel Cheers, Yann |
|
Tags |
mpirun, nodes, openfoam |
Thread Tools | Search this Thread |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
OpenFOAM course for beginners | Jibran | OpenFOAM Announcements from Other Sources | 2 | November 4, 2019 08:51 |
Optimizing OpenFOAM simulation | megs | OpenFOAM Running, Solving & CFD | 5 | September 3, 2019 03:50 |
OpenFoam 4.1: interDyMFoam LES Simulation for hydro turbine in river | pi__sec | OpenFOAM Running, Solving & CFD | 13 | July 19, 2017 04:08 |
OpenFOAM Training Jan-Jul 2017, Virtual, London, Houston, Berlin | CFDFoundation | OpenFOAM Announcements from Other Sources | 0 | January 4, 2017 06:15 |
Which turbulence model is applicable for Plain diffuser flow simulation in openFOAM? | mukut | OpenFOAM Running, Solving & CFD | 4 | January 30, 2015 08:06 |