MPI debugging with lldb attaching a process

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Leonardo Echeverria
Created

I'm launching lldb with mpi in the following way

`mpirun -np 4 xterm -e lldb ./GenerateCSCS`.

Following this I proceed to attach one of the processes to lldb:


but I get the message:

unable to attach
Debugger detached

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Anna Falevskaya
Created

Hi, Leonardo! Could you please launch your openMPI application (without -e lldb) and try attaching to this process with LLDB from CLion? Does it work?

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Leonardo Echeverria
Created

Yes is works! After doing the following:

1. Add these lines before breakpoint and rebuild the application (from OpenMPI)

int i = 0;
 while(0==i)
 sleep(5);

2. Launch your program from the terminal with `mpirun`

$mpirun -np 4 ./Application

3. Attach LLDB to a local process (Run-> Attach to Process)

4. Pause Program (the program will pause on `sleep(5)`)

5. Set `i!=0` and Resume Program

6. Happy debugging

Is there anyway to control the processes that are not attached? 

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Anna Falevskaya
Created

>Is there anyway to control the processes that are not attached? 

Do you mean that you want to control from CLion the processes which were launched outside CLion and to which you didn't attach in CLion? What do you want to do with them?

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