Shell Script for multithreading a process

Question

I am a Bioinformatician and recently stuck in a problem which requires some scripting to speed up my process. We have a software called PHASE and Command that i type in my c

Answer 1

Bash does not support multi-threading, however it does support multi-processing. If you change your command to be:

for i in {1..1000}; do
    ./PHASE test$i.inp test$i.out &
done

This will run each one a process and your computer will automatically schedule them based on how many core you have. 1000 Processes will have a lot of overhead compared to threads, but while not ideal it should still be fine.

Edit: Here is a more advanced method if you want to prioritize getting progressive answers:

#!/bin/bash
# Number of cores and range end
n=4
e=1000

# This function will do the processing
process() {
    for ((i=$1; i <= $3; i += $2)); do
        ./PHASE test${i}.inp test${i}.out
        echo "Done $i"
    done
}

# For each core create a process and record the pid
for ((i=1; i <= n; i++)); do
    process $i $n $e &
done

# Wait for each process to complete
wait