Hello everyone! I use Paraview 5.10.1 with MPI on Windows Client and Linux Server.
I have a problem regarding MPI. My goal is to have a Python module that will be placed both on client and server machine. Python commands from the module will be inputted via client Python Shell, and then a Programmable Source with script that uses commands from the same module will be created on server side. My approach is working when I deal with only one instance of pvserver. But when I run several instances using mpiexec on Linux machine Programmable Source isn’t created. In fact, it executes only RequestInformation part and then throws a SIGSEGV error.
To sum it up, I have a file
my_module.py that has command
create_stuff(filename). I connect to PV server that is run on Linux via mpiexec. I import
my_module on client and type
create_stuff_remote(filename) in client’s Python Shell and it imports
my_module on server and makes Programmable Source there that has
create_stuff(filename) in its Script. So in my understanding it is supposed to execute
create_stuff on all instances of pvserver
I try to turn on parallel execution with following lines (taken from here: custom parallel source using pythonalgorithm - #2 by pavel):
executive = self.GetExecutive() outInfo = executive.GetOutputInformation(0) outInfo.Set(vtk.vtkAlgorithm.CAN_HANDLE_PIECE_REQUEST(), 1)
executive = self.GetExecutive() outInfo = executive.GetOutputInformation(0) part = outInfo.Get(executive.UPDATE_PIECE_NUMBER()) print('ACQUIRED PART NUMBER: ', part) #just to checkif MPI is running ok #(here I run command from my module that takes filename as an argument, the filename is passed to function that sets ScriptRequestData)
(Clarifying: a Programmable Source ps_1 object is created in create_remote_stuff() and ps_1.Script and ps_1.ScriptRequestInformation is filled with lines above)
So the ScriptRequestInformation does work (checked via putting debug prints)
But I also tried to put
Get(executive.UPDATE_PIECE_NUMBER()) part in ScriptRequestInformation and outputted the part, and I got the same output
1 in all
n instances of pvserver
And rigt after that, supposedly before RequestData even started to execute (again, checked through debug prints) all server instances crash with tons of red text and errors such as:
Loguru caught a signal: SIGSEGV
error: exception occurred: Segmentation fault
EXIT CODE: 9
My questions are following: Is there anything that I did fundamentally wrong while trying to make this work? Is it possible to make parallel creation of Programmable Source between several servers and if so, what is a proper way to do that?
Thank you very much, any help will be appreciated!