How to listen port parallel in python + linux

Question

everyone! I have a python script, which process input from COM-port.

import sys
for string in sys.stdin:
    some_calculation(string)

It runs like this:

cat -v /dev/pts/2 | python3 'process.py'

I want to make it parallel, for example by using GNU parallel. My way is like this: A| parallel B

cat -v /dev/pts/2 | parallel  --pipe --recstart '>' python3 process.py

But it is not working.

Any ideas? Many thanks. UPDATE: I found some solution:

cat /dev/pts/2 | parallel -j2 "echo {} | python3 process.py"

Another one by Inian:

cat -v /dev/pts/2 | parallel --recstart '>' --pipe python3 process.py

Answer 1

You can invoke GNU parallel with the --pipe option as below:-

--pipe
        Spread input to jobs on stdin (standard input). Read a block
        of data from stdin (standard input) and give one block of data
        as input to one job.

Use the restart flag before the --pipe

cat -v /dev/pts/2 | parallel --recstart '>' --pipe python3 process.py

More info about GNU parallel .