Массивы

threads[0]="1"
threads[1]="3"
threads[2]="10"
threads[3]="100"
 
bytes[0]="64"
bytes[1]="256"
bytes[2]="512"
bytes[3]="1024"
 
 
for ((b=1;b<${#bytes[@]};b+ ))
 do
 
 for ((t=1;t<${#threads[@]};t  ))
 do
 
 
 echo "threads = ${threads[$t]} threads = ${bytes[$b]}"
 
 done
 
 #python main.py -B "part$i"
 
done