std.parallelism: Request for Review [Summary of discussion]

[dsimcha]

== Quote from jasonw (user at webmails.org)'s article
> dsimcha Wrote:
> > Ok, so that's one issue to cross off the list.  To summarize the discussion so
> > far, most of it's revolved around the issue of automatically determining how many
> > CPUs are available and therefore how many threads the default pool should have.
> > Previously, std.parallelism had been using core.cpuid for this task.  This module
> > doesn't work yet on 64 bits and doesn't and isn't supposed to determine how many
> > sockets/physical CPUs are available.  This was a point of miscommunication.
> >
> > std.parallelism now uses OS-specific APIs to determine the total number of cores
> > available across all physical CPUs.  This appears to Just Work (TM) on 32-bit
> > Windows, 32- and 64-bit Linux, and 32-bit Mac OS.
> Does a Hyperthread machine have 2x as much cores & worker threads ? In Pentium 4
HT might reduce throughput, in Core i7 increase it.

Someone please check on this for me.  I'd assume that these OS functions return
the number of logical CPUs, but they don't really seem to document and I don't
have the relevant hardware.