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concurrent-job-limit at LocalBackend clarifications needed

In my RNA-Seq workflows ( https://github.com/antonkulaga/rna-seq/blob/master/pipelines/quantification/quantification.wdl ) I have several sub workflows and a quantification task that runs salmon with several threads. It is not clear for me if concurrent-job-limit takes into account the only number of cromwell tasks or also how many threads those tasks are using and how tasks in sub workflows are counted.
My main problem is that salmon tasks eat way more CPU then others tasks because of multithreading and sometimes it crashes my server (I am using local-backend).

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