bash - gnu-parallel: exec: perl: not found -

i have 3 ec2 instances os centos7. i've installed parallel on 1 of instances (server1).

it's possible acces no ssh issue

ssh root@ip-10-0-xx-xx.xx-xx-1.compute.internal date gave me date.

ssh $server echo works works 

here i've created all_servers -file contains hostnames of servers (root@ip-10-0-xx-xx.xx-xx-1.compute.internal).

now i've written short bash-script name test:

#!/bin/bash echo 'hello' 

i want run script (started on server1). on server2 , server3 @ same time.

parallel ./test.sh --sshloginfile all_servers 

but it's showing academic tradition requires cite works base article on.... , after few enters it's showing hello (only on server1).

can explaining i'm doing wrong.

edit: tried without file:

    parallel --sshlogin root@ip-10-0-xx-xx.xx-xx-1.compute.internal echo hello  output: bash: line 0: exec: perl: not found 

i tried too:

parallel --tag --nonall --slf all_servers 

now get:

root@ip-10-0-0-xx.xx-xx-1.compute.internal  bash: line 0: exec: perl: not found root@ip-10-0-0-xx.xx-xx-1.compute.internal  bash: line 0: exec: perl: not found 

this:

parallel ./test.sh --sshloginfile all_servers 

is not same as:

parallel --sshloginfile all_servers ./test.sh 

you want last.

perl must installed on workers.

ssh remote perl -e \''print "ok\n"'\' 

must return ok.