Getting # Physical CPUs

[dsimcha]

== Quote from Don (nospam at nospam.com)'s article
> dsimcha wrote:
> > When I do parallel programming in D, it's nice to have a sane default for the
> > number of threads.  The ideal number is the number of cores that can see the
> > current address space.  core.cpuid provides coresPerCPU, but it doesn't appear
> > to provide nPhysialCPUs or something similar, which would allow the total
> > number of physical CPUs in the system to be determined.  Is there any easy way
> > to determine this in D2?
> coresPerCPU is a misnomer. It's actually the total number of cores. Will
> fix.

Ok, then maybe this is a bug and belongs in bugzilla.  Here's a little  test
program I wrote:

import core.cpuid, std.stdio;

void main() {
    writeln("Cores:  ", coresPerCPU, "  Threads:  ", threadsPerCPU);
}

This prints the following on the machine in question:

Cores:  1  Threads:  2

Here's a cat/proc/cpuinfo on the same machine:

processor       : 0
vendor_id       : GenuineIntel
cpu family      : 15
model           : 4
model name      :                Intel(R) Xeon(TM) MP CPU 3.66GHz
stepping        : 1
cpu MHz         : 3657.825
cache size      : 1024 KB
physical id     : 0
siblings        : 2
core id         : 0
cpu cores       : 1
fpu             : yes
fpu_exception   : yes
cpuid level     : 5
wp              : yes
flags           : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov
pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm syscall nx lm pni monitor
ds_cpl est tm2 cid cx16 xtpr
bogomips        : 7321.79
clflush size    : 64
cache_alignment : 128
address sizes   : 40 bits physical, 48 bits virtual
power management:

processor       : 1
vendor_id       : GenuineIntel
cpu family      : 15
model           : 4
model name      :                Intel(R) Xeon(TM) MP CPU 3.66GHz
stepping        : 1
cpu MHz         : 3657.825
cache size      : 1024 KB
physical id     : 4
siblings        : 2
core id         : 4
cpu cores       : 1
fpu             : yes
fpu_exception   : yes
cpuid level     : 5
wp              : yes
flags           : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov
pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm syscall nx lm pni monitor
ds_cpl est tm2 cid cx16 xtpr
bogomips        : 7314.82
clflush size    : 64
cache_alignment : 128
address sizes   : 40 bits physical, 48 bits virtual
power management:

processor       : 2
vendor_id       : GenuineIntel
cpu family      : 15
model           : 4
model name      :                Intel(R) Xeon(TM) MP CPU 3.66GHz
stepping        : 1
cpu MHz         : 3657.825
cache size      : 1024 KB
physical id     : 3
siblings        : 2
core id         : 3
cpu cores       : 1
fpu             : yes
fpu_exception   : yes
cpuid level     : 5
wp              : yes
flags           : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov
pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm syscall nx lm pni monitor
ds_cpl est tm2 cid cx16 xtpr
bogomips        : 7315.15
clflush size    : 64
cache_alignment : 128
address sizes   : 40 bits physical, 48 bits virtual
power management:

processor       : 3
vendor_id       : GenuineIntel
cpu family      : 15
model           : 4
model name      :                Intel(R) Xeon(TM) MP CPU 3.66GHz
stepping        : 1
cpu MHz         : 3657.825
cache size      : 1024 KB
physical id     : 7
siblings        : 2
core id         : 7
cpu cores       : 1
fpu             : yes
fpu_exception   : yes
cpuid level     : 5
wp              : yes
flags           : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov
pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm syscall nx lm pni monitor
ds_cpl est tm2 cid cx16 xtpr
bogomips        : 7315.01
clflush size    : 64
cache_alignment : 128
address sizes   : 40 bits physical, 48 bits virtual
power management:

processor       : 4
vendor_id       : GenuineIntel
cpu family      : 15
model           : 4
model name      :                Intel(R) Xeon(TM) MP CPU 3.66GHz
stepping        : 1
cpu MHz         : 3657.825
cache size      : 1024 KB
physical id     : 0
siblings        : 2
core id         : 0
cpu cores       : 1
fpu             : yes
fpu_exception   : yes
cpuid level     : 5
wp              : yes
flags           : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov
pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm syscall nx lm pni monitor
ds_cpl est tm2 cid cx16 xtpr
bogomips        : 7315.01
clflush size    : 64
cache_alignment : 128
address sizes   : 40 bits physical, 48 bits virtual
power management:

processor       : 5
vendor_id       : GenuineIntel
cpu family      : 15
model           : 4
model name      :                Intel(R) Xeon(TM) MP CPU 3.66GHz
stepping        : 1
cpu MHz         : 3657.825
cache size      : 1024 KB
physical id     : 4
siblings        : 2
core id         : 4
cpu cores       : 1
fpu             : yes
fpu_exception   : yes
cpuid level     : 5
wp              : yes
flags           : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov
pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm syscall nx lm pni monitor
ds_cpl est tm2 cid cx16 xtpr
bogomips        : 7315.07
clflush size    : 64
cache_alignment : 128
address sizes   : 40 bits physical, 48 bits virtual
power management:

processor       : 6
vendor_id       : GenuineIntel
cpu family      : 15
model           : 4
model name      :                Intel(R) Xeon(TM) MP CPU 3.66GHz
stepping        : 1
cpu MHz         : 3657.825
cache size      : 1024 KB
physical id     : 3
siblings        : 2
core id         : 3
cpu cores       : 1
fpu             : yes
fpu_exception   : yes
cpuid level     : 5
wp              : yes
flags           : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov
pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm syscall nx lm pni monitor
ds_cpl est tm2 cid cx16 xtpr
bogomips        : 7315.13
clflush size    : 64
cache_alignment : 128
address sizes   : 40 bits physical, 48 bits virtual
power management:

processor       : 7
vendor_id       : GenuineIntel
cpu family      : 15
model           : 4
model name      :                Intel(R) Xeon(TM) MP CPU 3.66GHz
stepping        : 1
cpu MHz         : 3657.825
cache size      : 1024 KB
physical id     : 7
siblings        : 2
core id         : 7
cpu cores       : 1
fpu             : yes
fpu_exception   : yes
cpuid level     : 5
wp              : yes
flags           : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov
pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm syscall nx lm pni monitor
ds_cpl est tm2 cid cx16 xtpr
bogomips        : 7315.03
clflush size    : 64
cache_alignment : 128
address sizes   : 40 bits physical, 48 bits virtual
power management: