[taggyum]

Thank you for releasing a new version of REEF3D(22.03).

When I run the tutorial case "9_13 Non-Breaking Wave Forces" without any modification using REEF3D(22.03), I get a ‘Segmentation fault’ error as shown in the screenshot below.
Of course, REEF3D and divemesh versions were applied as 22.03.

However, when REEF3D and divemesh version is applied to 21.11, it works well.
A screenshot of a successful operation is shown below.

could you please check this for me?

[kamath]

Hi taggyum,
I am unable to reproduce your error. This is a set of our benchmarks and therefore we ensure it is working on a regular basis.

The problem could lie with the update locally.
After you updated to the latest sourcecode, with git pull,
did you run:
make clean

before running
make -j N?

Remnants of objects from the previous compilation (in the build folder) can interfere with the new compilation.
Therefore, we highly recommend a "make clean" before building the new executables.

Also make sure that you in fact copied the latest built executables of both REEF3D and DiveMESH.

Let us know if this works, otherwise we will have to look at other avenues.

[valgrinda]

I can also confirm Arun's findings. Most likely cause of problem: no "make clean" before building.

[taggyum]

Dear Dr Hans & Arun,
Thank you very much for your help.

I applied the method you suggested, but I get the same problem.
But if I change the grid option from 3D to 2D as shown below, it works well.

B 1 0.025
B 10 0.0 18.0 0.0 0.025 0.0 1.0

I will check my environment and steps again.

Again thank you for your time!

[valgrinda]

Please try once more to delete all old .obj files and rebuild. Same for DIVEMesh.

[valgrinda]

Does it work? If not: what OS are you using? How do you run REEF3D?

[taggyum]

Originally Posted by valgrinda

Does it work? If not: what OS are you using? How do you run REEF3D?

Hi Hans, I really appreciate your help.

I cleaned and rebuilt everything according to your comment.
But unfortunately the error has not been resolved yet.

Here's the information.

== OS System information ==
Ubuntu app for Windows 10
Ubuntu : 20.04.4 LTS (GNU/Linux 4.4.0-19041-Microsoft x86_64)
CPU : AMD Ryzen Threadripper 3990X 64-Core Processor
RAM : 128GB

== Program information ==
gcc : 9.4.0
g++ : 9.4.0
mpicxx : 9.4.0
mpirun (Open MPI) 4.0.3

== Running the Code ==
./DiveMESH
mpirun –n [number of processes] REEF3D

V21.11 and V22.03 of REEF3D & DiveMESH were recompiled, and tests were performed on all tutorials of CFD.
The results of the additional tutorial cases are shown in the screenshot below.

[taggyum]

Originally Posted by valgrinda

Does it work? If not: what OS are you using? How do you run REEF3D?

However, it worked successfully on other computers with Linux(Ubuntu) OS, not on Windows App

== OS System information ==
Ubuntu 14.04 LTS

== Program information ==
gcc : 4.9.4
g++ : 4.8.5
mpicxx : 4.85
mpirun (Open MPI) 1.6.5

Again thank you for your time!

[kamath]

From the information you provide, looks like the problem is specifically in the Ubuntu app on windows. This will be hard to debug. But here are a few steps that might be useful.

use the command

nproc

That should give you the number of processors.
I see from recent experience that the maximum supported processors if the half of this value.
Could you change

M 10

to half the value that

nproc

gives you, in both control.txt and ctrl. txt and check.

Also, while you are at it, use

ll

to check if all the permissions are in place.

[taggyum]

Originally Posted by kamath

From the information you provide, looks like the problem is specifically in the Ubuntu app on windows. This will be hard to debug. But here are a few steps that might be useful.

use the command

nproc

That should give you the number of processors.
I see from recent experience that the maximum supported processors if the half of this value.
Could you change

M 10

to half the value that

nproc

gives you, in both control.txt and ctrl. txt and check.

Also, while you are at it, use

ll

to check if all the permissions are in place.

Sorry for the late reply because I was looking into the problem.

As Arun suggested, I checked the permissions problem by referring to the forum post. Permissions were set normally. In addition, the M10 has been tested, but the problem has not been solved.

But it worked successfully by modifying the value of Optimization Flags to -O1 as shown below.

== REEF3D Makefile ==
CXXFLAGS := -w –std=c++11 –O1 -> work
CXXFLAGS := -w –std=c++11 –O2 -> not work
CXXFLAGS := -w –std=c++11 –O3 -> not work

As you said, I think it's a local problem related to the compiler optimization of Windows Ubuntu app.

Thanks for your help and the work of the REEF3D team.

[kamath]

Hi,
I can confirm that I can reproduce this on the Ubuntu for windows environment.
But unable to reproduce it elsewhere.
Have not found a solution yet, but we will try to fix this.
Do let us know if this arises for any other cases, so that we could identify a pattern.

Thanks 😊

[taggyum]

Originally Posted by kamath

Hi,
I can confirm that I can reproduce this on the Ubuntu for windows environment.
But unable to reproduce it elsewhere.
Have not found a solution yet, but we will try to fix this.
Do let us know if this arises for any other cases, so that we could identify a pattern.

Thanks 😊

Hi Arun,
I will let you know if there is a problem in another situation.
Thank you for the effort of the REEF3D team.

best regards.

[valgrinda]

Hi taggyum,

can you try the 22.04 release, maybe working now?

[taggyum]

Hi Hans,

I tried with 22.04 release in Windows Ubuntu app and Windows VM Ubuntu environment, but it doesn't work.

However, as I investigated last time, it worked successfully under Optimization Flags –O1.

Thank you again for your work.

[keshav_20]

Hello taggyum and REEF3D team
I am also facing the same error while running DiveMESH.
@ taggyum, I have made changes in make file as you told in above reply post. However, I am still facing the same issue. I am using ubuntu app in window.
Is there any solution/alternative to this error?

Thanks and regards
Keshav

[taggyum]

hi keshav_20,
The error in this post has been fixed in REEF3D 22.04.1 version.
So there is no need to modify the makefile.
And the error in this post was REEF3D, not DiveMESH.


REEF3D(22.03 & 22.04) Segmentation fault - problem solving

[keshav_20]

Thanks for your reply
However, I am facing this issue in DiveMesh. Whenever, I increase the mess size in z-direction beyond 50, it gives "segmentation fault" error. Here, what can be done to resolve the error. I am attaching the "ctrl.txt" and "control.txt" files here with.

Thanks
KP

[taggyum]

hi keshav_20,

If you apply the S32 option in the file you provided, it seems that "segmentation fault" error occurs in "for loop" in the geometry_cyinder_y.cpp file.
Another way is to apply the S1 option using "solid.stl".
The S1 option works fine.