Thread Congestion in Java

Thread congestion can occur when two or more threads are trying to access the same, guarded data structure at the same time. By "guarded" I mean that the data structure is guarded using synchronized blocks or a concurrent data structure (Lock, BlockingQueue etc.) so that the data structure is thread safe. The resulting thread congestion means that the threads trying to access the shared data structure are spending a high amount of time waiting in line to access the data structure - wasting valuable execution time on waiting.

Chapters:
0:00 Thread congestion introduction
1:40 Thread congestion wastes thread execution time
2:22 Thread congestion alleviation solutions
3:05 Work stealing improvement
3:58 Thread congestion code examples

Thread Congestion in Java - Tutorial - Text:
https://jenkov.com/tutorials/java-concurrency/thread-congestion.html

Java Concurrency Tutorial - Text:
https://jenkov.com/tutorials/java-concurrency/index.html

Java Concurrency Video Playlist:
https://www.youtube.com/playlist?list=PLL8woMHwr36EDxjUoCzboZjedsnhLP1j4

Java Thread Visibility is covered in:
https://www.youtube.com/watch?v=LCSqZyjBwWA&list=PLL8woMHwr36EDxjUoCzboZjedsnhLP1j4&index=4
https://www.youtube.com/watch?v=oY14UyP61F8&list=PLL8woMHwr36EDxjUoCzboZjedsnhLP1j4&index=6
https://www.youtube.com/watch?v=eKWjfZ-TUdo&list=PLL8woMHwr36EDxjUoCzboZjedsnhLP1j4&index=6
https://www.youtube.com/watch?v=nhYIEqt-jvY&list=PLL8woMHwr36EDxjUoCzboZjedsnhLP1j4&index=6
https://www.youtube.com/watch?v=nNXkzDS6dOg&list=PLL8woMHwr36EDxjUoCzboZjedsnhLP1j4&index=9