Session Details

W-JAX | 6. - 10. November 2017, München

Dr. Heinz Kabutz

en

07 Nov 2017
15:00 - 16:00
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Turbo Charge CPU Utilization in Fork/Join using the ManagedBlocker

07 Nov 2017
15:00 - 16:00

Fork/Join is a framework for parallelizing calculations using recursive decomposition, also called divide and conquer. These algorithms occasionally end up duplicating work, especially at the beginning of the run. We can reduce wasted CPU cycles by implementing a reserved caching scheme. Before a task starts its calculation, it tries to reserve an entry in the shared map. If it is successful, it immediately begins. If not, it blocks until the other thread has finished its calculation. Unfortunately this might result in a significant number of blocked threads, decreasing CPU utilization. In this talk we will demonstrate this issue and offer a solution in the form of the ManagedBlocker. Combined with the Fork/Join, it can keep parallelism at the desired level.

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