How can I execute three or more Python scripts in parallel?
Currently I am executing three Python scripts in three different consoles of Spyder.
One solution could be to import all the scripts and then simultaneously execute them in a function.
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I have two folders, 1 and 2. Each folder has a Python file with the same name: 220_beta_1e-2_47_53ND.py. How do I run both the Python files simultaneously on different consoles? I mostly use Spyder.
on powershell (replace XYZ with your python version)
Invoke-Item C:\PythonXYZ\python.exe pathtoscript1; Invoke-Item C:\PythonXYZ\python.exe pathtoscript2;
or rather create a third script in python that launches 2 processes
I want to run multiple programs in parallel in Spyder. How do I do it? I tried deactivating Use a single instance under Preferences---Applications but this didn't help.
I have two Python concurrent-related questions that want someone's clarification.
Task Description:
Let us say I set up two py scripts. Each script is running two IO-bound tasks (API Calls) with multithreading (max workers as 2).
Questions:
If I don't use a virtual environment, and run both scripts through the global Python interpreter (the one in system-wide Python installation). Does this make the task I described the single process and multithreaded? Since we are using one interpreter (single process) and have two scripts running a total of 4 threads?
If I use the Pycharm to create two separate projects where each project has its own Python interpreter. Does such a setting turn the task into multiprocessing and multithreaded? Since we have two Python interpreters running and each running two threads?
Each running interpreter process has its own GIL that's separate from any other GILs in other interpreters that happen to be running. The project and virtual environment associated with the script being run are irrelevant. Virtual environments are to isolate different versions of Python and libraries so libraries from one project don't interfere with libraries in another.
If you run two scripts separately like python script.py, this will start two independent interpreters that will be unaffected by the other.
Does such a setting turn the task into multiprocessing and multithreaded?
I don't think it's really meaningful to call it a "multiprocess task" if the two processes are completely independent of each other and never talk. You have multiple processes running, but "multiprocessing" within the context of a Python program typically means one coherant program that makes use of multiple processes for a common task.
I want to use a go executable: timescaledb-parallel-copy to insert data into database from a csv file. However, I plan to use Python for reading in the filename and lookup the appropriate table name for insertion. If I then launch timescaledb-parallel-copy as a Python subprocess to execute on shell, will it still be parallel? I do not need Python to make it parallel, it is parallel by default. I just do not want Python to make it single-threaded.
If you are using subprocess.run() then your program, timescaledb-parallel-copy will execute as if you had called it from the shell. It will still be in parallel. The python script will not be, and will wait on timescaledb-parallel-copy to return.
Yes, I believe it will be. By launching the program as a subprocess, you are running the program as it originally would be, with no interference from python.
I have 2 scripts:
python script
matlab script
I need to run this two scripts in parallel (no output for both of them). I was thinknig to call to the python scirpt, from the matlab script.
I know it is possible to run python script from matlab like:
systemCommand='my_script.py'
system(systemCommand)
however in this way, the matlab script will wait to the return of the python script, and the rest of my matlab script will not be executed.
any ideas?
As mentioned near the end of MATLAB's system documentation in the "Tips" section, to run a system command in the background (on *nix), you can append an ampersand(&) to the end of your command to tell it to run in the background.
system('my_script.py &')
If you're on Windows, you'll want to use the following to prevent a command window from opening.
system('start /b my_script.py');