Revert "Merge pull request #2 from josenavas/start_parallel"

This reverts commit 34672796ab6f7e35a1fce86e57764e4a839b675e, reversing
changes made to 640e82cf82a1f29f353a6216d8d39707d0da0701.
Merge pull request #3 from josenavas/revert-pull-request-2

Revert "Merge pull request #2 from josenavas/start_parallel"