Block execution until all workers reach this call
labBarrier blocks execution of a parallel
algorithm until all workers have reached the call to
This is useful for coordinating access to shared resources such as file I/O.
Synchronize Workers for Timing
When timing code execution on the workers, use
to ensure all workers are synchronized and start their timed work
labBarrier; tic A = rand(1,1e7,'codistributed'); distTime = toc;