On 2017-04-23 13:53, Sönke Ludwig wrote:

It almost looks like it never scales beyond a single core for some
reason.

I've seen similar behaviors when I was running performance tests on a
small vibe.d application last year. It had the same performance
regardless if it was running single or multi-threaded.

BTW, how does vibe.d's multi-threading functionality works? Does it
spread the fibers across multiple threads or does it use multiple event
loops?

/Jacob Carlborg