View Issue Details
| ID | Project | Category | View Status | Date Submitted | Last Update |
|---|---|---|---|---|---|
| 0002821 | OpenFOAM | Bug | public | 2018-01-29 09:04 | 2018-02-02 17:25 |
| Reporter | lars | Assigned To | henry | ||
| Priority | high | Severity | feature | Reproducibility | always |
| Status | closed | Resolution | no change required | ||
| Platform | GNU/Linux | OS | Ubuntu | OS Version | 16.04 |
| Summary | 0002821: foamJob stops without internet connection | ||||
| Description | I realised that my simulation stops invariably when I execute a parallel descomposition of the case, I run it, and I unplug the ethernet Lan wire. After a short while (about 2 min) the running stops. NO error message, no notification. It stops as if I 'ctrl + c'. | ||||
| Steps To Reproduce | I execute: foamJob -s -p rhoCentralFoam (with 8 cores running) Then I unplug the ETHERNET LAN wire (pc loses internet connexion) After short time (2 min) simulation stops | ||||
| Additional Information | So I assume that foamJob uses, for some reason, the internet connexion, and If disconnected, It stops. I need this issue solved because I work in a place where the internet get down sometimes during the weekend, and so I get stopped my simulation trhough the weekend. | ||||
| Tags | No tags attached. | ||||
|
|
Try running with nohup |
|
|
I did it. No changes at all. It stops anyway |
|
|
Is the issue with using foamJob? Try running without foamJob and use nohup and redirect input and output. Can you reproduce the problem with other non OpenFOAM batch applications? |
|
|
I think the issue is by using mpirun In the end foamJob uses mpirun |
|
|
If Open-MPI is being used, then it's because it uses greedy connections by default and if the relevant connection is dropped, it gets utterly lost without it. There is an option for Open-MPI's 'mpirun' for restricting to only using the local memory system, if a single machine is used: mpirun ... --mca btl self ... A few more details are available on Open-MPI's FAQ pages, for example: - On TCP: https://www.open-mpi.org/faq/?category=tcp - On Shared Memory: https://www.open-mpi.org/faq/?category=sm - On how to set-up MCA parameters: https://www.open-mpi.org/faq/?category=tuning#setting-mca-params In the last link, it tells how to set environment variables for the relevant MCA entry... if I'm not mistaken, the option above can be done automatically by running the following command before 'foamJob' or 'mpirun': export OMPI_MCA_btl=self I don't know if it's a good idea to add this to the OpenFOAM User Guide, but at least pointing people to the Open-MPI FAQ would be nice ;) |
|
|
Dear Bruno, thank you for your detailed answer. I have tried and added a last command in the bashrc : ' export OMPI_MCA_btl=self ' But, nothing changes. It still gets down after 1 minute once internet is shutted down. To me I find a huge mistake that, by default, all the simulation depends on whether there is internet or not. I appreciate it as a bug. |
|
|
Have you tested running serial? It appears that the problem is with OpenMPI and not OpenFOAM and running serial will check this. If the problem is with OpenMPI you should report it to the maintainers of that package or you could try one of the alternative MPI implementations. |
|
|
This issue relates to the operation of OpenMPI rather than OpenFOAM and should be reported to the maintainers of OpenMPI. |
| Date Modified | Username | Field | Change |
|---|---|---|---|
| 2018-01-29 09:04 | lars | New Issue | |
| 2018-01-29 09:09 | henry | Note Added: 0009226 | |
| 2018-01-29 09:26 | lars | Note Added: 0009227 | |
| 2018-01-29 09:41 | henry | Note Added: 0009228 | |
| 2018-01-29 09:59 | lars | File Added: ordres comandes.png | |
| 2018-01-29 09:59 | lars | Note Added: 0009229 | |
| 2018-01-29 10:51 | wyldckat | Note Added: 0009230 | |
| 2018-02-02 07:31 | lars | Note Added: 0009239 | |
| 2018-02-02 10:57 | henry | Note Added: 0009240 | |
| 2018-02-02 17:25 | henry | Assigned To | => henry |
| 2018-02-02 17:25 | henry | Status | new => closed |
| 2018-02-02 17:25 | henry | Resolution | open => no change required |
| 2018-02-02 17:25 | henry | Note Added: 0009249 |
