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It’s a question how you define “simultaneously”. If you create a loop or use some common tools for it, it’s often not really simultaneously but instead one node after the other. Even if these tools fork: if there is only one network interface in your local machine, it can’t be started on all nodes at the same time. To have it running really simultaneously on all machines, it would mean to synchronize the clocks and prepare them to start at a predefined time the script in question.
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