Running Phobos unit tests in threads: I have data

[Atila Neves via Digitalmars-d]

Like I mentioned afterwards, I tried a different number of 
threads. On my machine, at least, std.parallelism.totalCPUs 
returns 8, the number of virtual cores. As it should.

Atila

On Sunday, 4 May 2014 at 07:49:51 UTC, Russel Winder via 
Digitalmars-d wrote:
> On Sat, 2014-05-03 at 19:37 +0000, Atila Neves via 
> Digitalmars-d wrote:
> […]
>> I'm using parallel and taskPool from std.parallelism. I was 
>> under the impression it gave me a ready-to-use pool with as 
>> many threads as I have cores.
>
> There is a default, related to the number of cores the OS 
> thinks there
> is (*), but you can also set the number manually.  
> std.parallelism could
> do with some work to make it better than it already is.
>
>
> (*) Physical cores are not necessarily the number reported by 
> the OS due
> to core hyperthreads. Quad core no hyperthreads, and dual core, 
> two
> hyperthreads per core, both get reported as four processor 
> systems.
> However if you benchmark them you get very, very different 
> performance
> characteristics.