Cfrtjryk

Assume I have a python script that I want to run with different parameter combinations (I have MacBook Pro). If I use a shell script to do so (say run.sh), does it make sense to run run.sh multiple times at the same time, each of which in different parameter combinations? In order word, do different parameter combinations touch each other while both are running in the memory? Is this something like the concept of memory protection?

This depends very much on what the python script and run.sh does.

So let's take a very simple example:

#!/bin/bash



s=$(( RANDOM%5 ))

echo Sleeping for $s > /tmp/foo

sleep $s

echo You entered $1 >> /tmp/foo

cat /tmp/foo

Now if I did

./run.sh 1 &

./run.sh 2 &

./run.sh 3 &

I will have no idea what the output would be. That's because the script has a single resource (/tmp/foo) that can not be accessed multiple times; one script will overwrite the results of another.

If, instead, the script was written to use properly unique "temporary" resources then it can be called multiple times:

#!/bin/bash



tmpfile=$(mktemp)



s=$(( RANDOM%5 ))

echo Sleeping for $s > $tmpfile

sleep $s

echo You entered $1 >> $tmpfile

cat $tmpfile

rm $tmpfile

Now you can call this as many times as you like, and it will work properly.

Well... given memory and CPU limits, of course!