First contact with Fibers

[Alan Bateman]

On 13/08/2019 16:50, Christian Stein wrote:
> :
>
> Using `-Xmx2G` the error didn't occur. The execution of the million
> fibers took about 223 seconds -- too much pressure for the virtual
> machine provided by GitHub/Azure Pipeline, methinks: [1]
Thanks confirming that increasing the heap size works around the OOME 
handling issue. I don't think I can explain the 223 seconds.  I tried it 
on both Linux and macOS and it runs in about 5s, which is similar to 
what you seeing on Windows.

$ java -Djdk.defaultScheduler.parallelism=4 -p lib:bin/main/modules -m 
org.junit.platform.console --details SUMMARY --scan-modules --config 
tests=1000000 --config thread=false

:

Test run finished after 5016 ms
[         1 containers found      ]
[         0 containers skipped    ]
[         1 containers started    ]
[         0 containers aborted    ]
[         1 containers successful ]
[         0 containers failed     ]
[   1000000 tests found           ]
[         0 tests skipped         ]
[   1000000 tests started         ]
[         0 tests aborted         ]
[   1000000 tests successful      ]
[         0 tests failed          ]

>
> Did you take a quick glance at two implementations? Are they ... okay?
> Or am I missing something?
Looks okay, at least for experimentation but I wouldn't expect unit 
tests to spend a lot of waiting/sleeping/blocked (some will but I would 
guess that it's the minority).

-Alan.