12. Threads

1. Review presentation Threads

   Practical exercise

2. Investigate jtm.activity12 package
3. Look at Activity12.png to understand design and 3 different approaches of array filling
4. Implement classes ArrayFiller, and ArrayFillerManager to pass unit tests

 To check load on processor, run top command or System monitor.
Additionally you can add CPU monitor:

1. Right click on free space of the panel, select Panel — Add new Items..
2. Select CPU Graph and press Add.
3. Then left click on CPU graph to open task manager.

4. You can also install gnome-system-monitor:

   sudo apt install gnome-system-monitor

   Then run Start menu — System — System monitor.

 You implement latency with Thread.sleep(latency); method

Optional task

1. Try to analyse execution of fillParalelly() method step-by-step in Eclipse Debugger.
2. Compare it with debugging experience by writing informative messages into standard output by System.out.println() and step-by-step analysis of produced output after execution of your program.

Alternative

• ExecutorService
• CompletableFuture