Python GNU parallel single command on multiple cores

Shell Programming and Scripting
1

Hello,

I have a 4 core machine.

Here is my initial script

cd /work/
python script.py input.txt output.txt 1 2 3

This script runs for 1.5hrs.

So I read across the web and figured out that you can use GNU parallel to submit multiple jobs using parallel. But I am not sure if I can run single command on multiple processors. Still, I went ahead and used the following command

cd /work/
parallel python script.py input.txt output.txt 1 2 3

Here is the error

parallel: Warning: Input is read from the terminal. Only experts do this on purpose. Press CTRL-D to exit.
2

Hello Jacobs.smith,

Not sure about your complete code/requirement(as you haven't shown us) but seems like it may be code is executing a process into a sub-shell then there it is expecting a variable to be passed rather than it gets passed while running the script.

Thanks,
R. Singh

3

But the script is designed to take inputs from the terminal itself.

Do you know of a way where I can run a python command on multiple processors instead of one?

Thank you for your time R.Singh.

4

Can you modify the python script and use the multiprocessing module.

5

All I can access it is for execution only.

I cannot edit it.