Parallel Streams #

Java streams can be processed in parallel automatically. The implementation of parallel streams is based on work stealing with the common ForkJoinPool.

Our StreamRenderer is computing pixels using a stream. Here is part of its implementation, again.

box.pixels().forEach(pixel -> {
  // omitted
});

The following change turns this implementation into a work stealing renderer using available processors efficiently.

box.pixels().parallel().forEach(pixel -> {
  // omitted
});

The following picture has been created with the parallel version of the StreamRenderer.

The colors show that work is split differently than with our custom implementation. Nevertheless, many threads were involved in rendering the bottom right corner of the picture.