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[Runtime] add env options to define workerCount and pinningOffset

Maxim Onciul requested to merge env_options into master

Introduced environment variables:

  • EMPER_WORKER_COUNT: specifies how many worker the Runtime default constructor starts.
  • EMPER_PINNING_OFFSET: specifies the cpu id where the workers should be pinned round robin.

Both variables allow multiple emper processes to run on the same system by splitting the available cores.

EMPER_WORKER_COUNT=1 build/apps/echoserver && EMPER_WORKER_COUNT=1 EMPER_PINNING_OFFSET=1 build/apps/echoclient

Starts a single threaded echoserver on core 0 and a single threaded echo client on core 1.

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