shootout-spectralnorm resurection with parallelization

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Le 2013-11-28 20:52, Daniel Micay a écrit :

Isn't using RWArc for this really slow?

(strange, I can't find this comment on github)

In fact, if you look at the code carefully (see fn mult), in parallel,
1 RWArc (v)is only used as read during a long time by multiple tasks
(100), and 1 RWArc (out) is used in write mode only to set a value
in a vector at the end of each tasks (RWArc::write concurrency is on a
very short time). As RWArc::read is almost the same thing as using
Arc, this code works quite well. I tried to use Arc in tasks for
read only data, and writing in one unique task reading messages, but it
is slower (by memory, 10% slower) and more complicated.

I didn't profile the code, but it seems that most of the time spend is
in the A function.