In mapdl.input_strings(cmd), if cmd is very long command, it fails with MapdlExitedError

[DeepLineD]

🔍 Before submitting the issue

• I have searched among the existing issues
• I am using a Python virtual environment

🐞 Description of the bug

in python, mapdl.input_strings(cmd), cmd is a very long command. If it is not called in the method, it will be executed normally. If it is put in the method, the error "ansys.mapdl.core.errors.MapdlExitedError: MAPDL server connection terminated" will be reported.

📝 Steps to reproduce

1，Define a string containing multiple commands
2，Then mapdl calls input_strings(cmd) to execute

💻 Which operating system are you using?

Windows

📀 Which ANSYS version are you using?

2023R1

🐍 Which Python version are you using?

3.11

📦 Installed packages

ansys

[RobPasMue]

Transferring to PyMAPDL repository - pinging @ansys/pymapdl-maintainers

[germa89]

Hi @DeepLineD

The following code runs a very long sequence of APDL commands using
mapdl.input_strings:

from ansys.mapdl.core import launch_mapdl

mapdl = launch_mapdl(start_instance=False, port=50082)

cmd = ["/prep7"]

for i in range(1000000):
    cmd.append(f"/com hello {i}")

cmd = "\n".join(cmd)

print(len(cmd))
print("Running...")
out = mapdl.input_strings(cmd)
print(out[-400:])

And it does not fail:

(.venv) ➜  pymapdl git:(main) python temp.py
17888896
Running...
 999971
 hello 999972
 hello 999973
 hello 999974
 hello 999975
 hello 999976
 hello 999977
 hello 999978
 hello 999979
 hello 999980
 hello 999981
 hello 999982
 hello 999983
 hello 999984
 hello 999985
 hello 999986
 hello 999987
 hello 999988
 hello 999989
 hello 999990
 hello 999991
 hello 999992
 hello 999993
 hello 999994
 hello 999995
 hello 999996
 hello 999997
 hello 999998
 hello 999999

Using MAPDL v24.2 (docker image) and the following configuration:

Details

-------------------------------------------------------------------------------
PyAnsys Software and Environment Report
-------------------------------------------------------------------------------
  Date: Tue May 14 16:59:17 2024 CEST

                               OS : Darwin
                           CPU(s) : 8
                          Machine : arm64
                     Architecture : 64bit
                              RAM : 16.0 GiB
                      Environment : Python
                      File system : apfs
                       GPU Vendor : Apple
                     GPU Renderer : Apple M2
                      GPU Version : 4.1 Metal - 88

  Python 3.10.11 (v3.10.11:7d4cc5aa85, Apr  4 2023, 19:05:19) [Clang 13.0.0
  (clang-1300.0.29.30)]

                 ansys.mapdl.core : 0.69.dev0
                            numpy : 1.26.1
                     platformdirs : 3.11.0
                            scipy : 1.11.3
                             grpc : 1.59.0
               ansys.api.mapdl.v0 : Version unknown
               ansys.mapdl.reader : 0.53.0
                  google.protobuf : 3.20.3
                       matplotlib : 3.8.3
                          pyvista : 0.43.4
                           pyiges : 0.3.1
                             tqdm : 4.66.1
               ansys_sphinx_theme : 0.12.4
                   ansys.dpf.core : 0.9.0
                   ansys.dpf.post : Module not found
                   ansys.dpf.gate : 0.4.1
                ansys.fluent.core : Module not found
       ansys.fluent.visualization : Module not found
          ansys.fluent.parametric : Module not found
      ansys.grantami.bomanalytics : Module not found
             ansys.openapi.common : Module not found
ansys.platform.instancemanagement : 1.1.2
                   ansys.seascape : Module not found
               ansys.tools.report : 0.6.0
           ansys.tools.versioning : 0.5.0
                           pyaedt : Module not found
                          appdirs : 1.4.4
                          pexpect : 4.8.0
-------------------------------------------------------------------------------
Ansys Environment Report
-------------------------------------------------------------------------------


Ansys Installation
******************
No Ansys installations provided


Ansys Environment Variables
***************************
PYMAPDL_START_INSTANCE         False
PYMAPDL_PORT                   50092
DPF_START_SERVER               false
DPF_PORT                       50056
DPF_DEFAULT_PORT               50056
DPF_DOCKER_IMAGE               ghcr.io/ansys/dpf-core:22.2dev

Can you provide us with the model and code that fails for you?