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Open Source Workflow Engines Written in Java » Concurrent processing of splits? » Parallel Split should use Concurrent Threads »
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Of course, a process engine is a virtual machine and high level workflow languages don't have the low-level notion of thread.
But still, the point is: if your process declares tasks to be parallel, why should the engine serialize their execution, effectively killing the performance of your workflow?
do you really think your single-core CPU is doing things in parallel ?