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

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

On Thursday, April 5, 2018 at 9:09:49 AM UTC-6, Dmitry A. Kazakov wrote:

> That is unfair! (:-)) With protected object and same token you can 
> "pass" it at all available cores without blocking, at once, which IMO 
> defeats the idea of the benchmark, but shows how cool are Ada's tasking 
> primitives.

I see your point, :-) but I still feel its fair in that there are 503 "pseudo threads" that each serially get access to the protected object in a ring fashion, each "pseudo"-thread in fact stores its reference inside the protected object when it "has" the baton. At time same time, there are also 503 real OS threads driving the thing, where the semantics of a protected object is that there is a queue for an entry, and the queue is serviced serially, even if the implementation of the queue happens to be efficient. Since there are only 503 threads and 50_000_000 iterations, each OS thread (Ada task) has to requeue on the protected entry many many times.

Brad