Re: Large number of tasks slows down my program (using debian) - any fix?

[Brad Moore <bmoore.ada@gmail.com>]

Another data point is the entry I submitted to the Computer Language Benchmark Games site for the Thread-Ring benchmark.

The problem there is to create 503 tasks, and then use some sort of message passing to pass a "token" in a ring from from task to the next, 50_000_000 times, printing out the task number that ended up with the token at the end.

I used a protected object to pass a "token" between the tasks. I believe the reason why it works as fast as it did, is that an Ada protected object can have one task perform the action of the protected object on behalf of other tasks that are queued on an entry of the protected object.

Source code:

https://benchmarksgame-team.pages.debian.net/benchmarksgame/program/threadring-gnat-6.html

The results comparing this version against other approaches in other languages can be seen here, where the entries are executed on a quad-core machine:

Note, the approaches by different languages are very different from each other,
so in some sense, this is like comparing apples and oranges.

https://benchmarksgame-team.pages.debian.net/benchmarksgame/performance/threadring.html

All the benchmarks can be accessed from the top level of the site
https://benchmarksgame-team.pages.debian.net/benchmarksgame/

Brad.