The Middleman System is what you need to unleash the power of your multi-processor and multi-core computers.
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Middleman uses a different approach to accomplish the same thing as PPSS: parallel processing using shell scripts. It seems that Middleman focuses on parallelising tasks within existing shell scripts. PPSS on the other hand just executes entire scripts or commands in parallel.
Use the tool you need. So take a look at the following link to learn more about Middleman: