[cojua8]

hello,

I've been trying to reconstruct form a parallel run but i keep getting this error

Create time



--> FOAM FATAL ERROR: 
No processor* directories found

    From function int main(int, char**)
    in file reconstructPar.C at line 217.

FOAM exiting

what can i do?

[alexeym]

Hi,

Let's read the error:

No processor* directories found

It means, there is no processor* folders in the directory, where you are running reconstructPar (in general parallel cases are decomposed into processor* folders, though now there is collated output).

So, you can check if a) you are running reconstructPar in the folder, where you ran parallel case, b) your data is not automatically reconstructed.

[cojua8]

thank you for your answer!

I just copied a case that ran well in other folder, and ran ir wihtout any major modifications, so there should be no problem

[alexeym]

OK. Maybe there SHOULD be no problem, BUT since you post question here, there IS a problem.

Could you at least post "ls" command output in the folder, where you run reconstructPar?

[cojua8]

hi again

I've got these files/directories in the running directory

0/         postProcessing/  processor3/  log.blockMesh      log.postChannel
0.orig/    processor0/      system/      log.decomposePar   log.reconstructPar
1e-05/     processor1/      Allclean*    log.ls             log.renumberMesh
constant/  processor2/      Allrun*      log.pimpleLPTFoam

[alexeym]

Hi,

If we take a look at the code, which produces error:

    // Determine the processor count
    label nProcs = fileHandler().nProcs(args.path(), regionDirs[0]);

    if (!nProcs)
    {
        FatalErrorInFunction
            << "No processor* directories found"
            << exit(FatalError);
    }

If fileHandler().nProcs(...) returns 0, fatal error raised. Here is how nProcs is calculated:

    label nProcs = 0;
    while
    (
        isDir
        (
            dir
           /(word("processor") + name(nProcs))
           /"constant"
           /local
           /polyMesh::meshSubDir
        )
    )
    {
        ++nProcs;
    }

So question is do you have mesh subfolders in these processor folders.

[cojua8]

You are right,

there is no "constant" in any processor* directory, but checking decomposePar log there are no errors.

I think the problem comes when running renumberMesh, it creates a new "1e-5" folder with the renumbered polymesh and fields and then decomposePar doesn't create a constant subfolder into processor*.

So I guess I have to move the renumbered polymesh to constant and after that run decomposePar, am I right?

[alexeym]

You can just run renumberMesh with -overwrite flag, this way it writes renumbered mesh in constant folder.

[HakikiCanakkaleli]

For future reference:

The piece of code Alexeym kindly highlighted is different in OF 1706 version:

    // determine the processor count directly
    label nProcs = 0;
    while (isDir(args.path()/(word("processor") + name(nProcs))))

It therefore seems no subfolder is in search for this particular version, or might be for other versions as well.

[alexeym]

@HakikiCanakkaleli

Just for the future reference:

isDir(args.path()/(word("processor") + name(nProcs)))

is a check for the SUBFOLDER with a name "processor*". isDir checks if argument is a directory, args.path() returns case path, word("processor") + name(nProcs) constructs name of subfolder, and finally / is overloaded concatenation operator for file names.

[HakikiCanakkaleli]

Hi,

I think some confusion arose, and likely I led it to happen. I meant with the above piece of code that the sub-subfolder "constant" and other n level deep folders were not looked up, based on your kindly sharing of the following code:

label nProcs = 0; while ( isDir ( dir /(word("processor") + name(nProcs)) /"constant" /local /polyMesh::meshSubDir ) ) { ++nProcs; }

[alexeym]

Hi,

ESI OpenFOAM v1706 is based on Foundation OpenFOAM 4.x and in 4.x the code is the same (i.e. simple while loop with subfolder check). I have posted snippets from OpenFOAM 5.x.

So, yes, there was certain confusion on my side.

[HakikiCanakkaleli]

My apologies

[deepbandivadekar]

This discussion was very useful. Thank you.

I am wondering however, since I already have this sort of situation due to renumberMesh without overwrite tag, if at all is it possible to visualize the results. I don't really wish to give up hours of simulation data.

[alexeym]

Hi,

Since you can not visualize your results, you can not be sure if the results are meaningful. So in addition to possibility of losing time waiting for the answer, you still can lose all these hours of simulation data, as the data can be complete nonsense.

Could you describe exact steps to reproduce your error? Small test case could be also useful.

[deepbandivadekar]

Originally Posted by alexeym

Hi,

Since you can not visualize your results, you can not be sure if the results are meaningful. So in addition to possibility of losing time waiting for the answer, you still can lose all these hours of simulation data, as the data can be complete nonsense.

Could you describe exact steps to reproduce your error? Small test case could be also useful.

I realised what caused the error. I had mistakenly forgotten to provide correct writeInterval when I changed the writeControl to adjustable type. Since I never reached that point not a single directory was written during the run. That's why the error.

[9434]

Originally Posted by cojua8

hello,

I've been trying to reconstruct form a parallel run but i keep getting this error

Create time



--> FOAM FATAL ERROR: 
No processor* directories found

    From function int main(int, char**)
    in file reconstructPar.C at line 217.

FOAM exiting

what can i do?

you can also manually make a constant directory in each processor directory and move polyMesh which is in "processor*/0 or 1".

[beatlejuice]

Hello everyone,
since my topic is related to the one above, I wonder if someone knows why the following problem arises and how I can avoid it.

I have to use the "-fileHandler collated" option for my cases due to a file number limitation. The OF Version is 5.0.

So, these are my steps:

1. decomposePar -fileHandler collated #(for 1000 cores ... works perfectly)
2. mpirun -np 1000 renumberMesh -overwrite -parallel -fileHandler collated #(works)
3. mpirun -np 1000 pisoFoam -parallel -fileHandler collated #(no problem)
4. reconstructPar -fileHandler collated #(problem)

At step 4 (reconstructPar), I get the following error:

================================================== ====
--> FOAM FATAL IO ERROR:
Could not detect processor number from objectPath:"caseName/constant/polyMesh/pointZones"

file: caseName/processors/constant/polyMesh/pointZones at line 15.

From function virtual Foam::autoPtr<Foam::ISstream> Foam::fileOperations::masterUncollatedFileOperatio n::readStream(Foam::regIOobject&, const Foam::fileName&, const Foam::word&, bool) const
in file global/fileOperations/masterUncollatedFileOperation/masterUncollatedFileOperation.C at line 1105.

FOAM exiting
================================================== =====

If I rerun my steps above but do not use the renumbering in step 2 everything works - including the reconstruction. So, the problem comes from renumberMesh in combination with the -fileHandler collated.

Any ideas how to get this working and to be able to use the benefit of renumberMesh and still be able to reconstruct the case? The file caseName/processors/constant/polyMesh/pointZones exists and looks OK ...

cheers!

[beatlejuice]

Update:
I figured it out myself ... two minutes after I submitted my previous post =)

For everybody who face the same problem:

Delete or rename the following files that the renumberMesh utility writes and then the reconstructPar should work:

- processors/constant/polyMesh/pointZones
- processors/constant/polyMesh/faceZones
- processors/constant/polyMesh/cellZones

Cheers!

[WaterHammer1985]

Originally Posted by beatlejuice

Update:
I figured it out myself ... two minutes after I submitted my previous post =)

For everybody who face the same problem:

Delete or rename the following files that the renumberMesh utility writes and then the reconstructPar should work:

- processors/constant/polyMesh/pointZones
- processors/constant/polyMesh/faceZones
- processors/constant/polyMesh/cellZones

Cheers!

Appreciate you replying back with your solution! Do you know how to view the decomposed results in ParaView when the processors are collated? I've made the same changes above but nothing loads when I try to bring it into ParaView.

Cheers!