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.
