Qt-interest Archive, August 2006
How to get number of physical CPUs in RHEL & SuSE
Message 1 in thread
From my application code, I want to get number of
physical processors present in system (RHEL & SuSE).
How do i go about?
sysconf( ) - provides only logical CPUs count, not
physical CPUs count
Thanks,
++Sathya
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Message 2 in thread
On Tue, Aug 29, Srinivasan Sathyanarayanan wrote:
> From my application code, I want to get number of
> physical processors present in system (RHEL & SuSE).
> How do i go about?
>
> sysconf( ) - provides only logical CPUs count, not
> physical CPUs count
>
You can look at /proc/cpuinfo
This box has 2 real CPUs:
processor : 0
vendor_id : GenuineIntel
cpu family : 6
model : 8
model name : Pentium III (Coppermine)
stepping : 6
cpu MHz : 864.382
cache size : 256 KB
fdiv_bug : no
hlt_bug : no
f00f_bug : no
coma_bug : no
fpu : yes
fpu_exception : yes
cpuid level : 2
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 mmx fxsr sse
bogomips : 1703.93
processor : 1
vendor_id : GenuineIntel
cpu family : 6
model : 8
model name : Pentium III (Coppermine)
stepping : 6
cpu MHz : 864.382
cache size : 256 KB
fdiv_bug : no
hlt_bug : no
f00f_bug : no
coma_bug : no
fpu : yes
fpu_exception : yes
cpuid level : 2
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 mmx fxsr sse
bogomips : 1724.41
This box has 2 cores and hyperthreading ("ht" in flags):
processor : 0
vendor_id : GenuineIntel
cpu family : 15
model : 4
model name : Genuine Intel(R) CPU 3.00GHz
stepping : 4
cpu MHz : 2994.478
cache size : 1024 KB
physical id : 0
siblings : 2
core id : 0
cpu cores : 2
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 constant_tsc pni monitor ds_cpl est cid cx16 xtpr
bogomips : 5998.34
clflush size : 64
cache_alignment : 128
address sizes : 36 bits physical, 48 bits virtual
power management:
processor : 1
vendor_id : GenuineIntel
cpu family : 15
model : 4
model name : Genuine Intel(R) CPU 3.00GHz
stepping : 4
cpu MHz : 2994.478
cache size : 1024 KB
physical id : 0
siblings : 2
core id : 1
cpu cores : 2
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 constant_tsc pni monitor ds_cpl est cid cx16 xtpr
bogomips : 5989.34
clflush size : 64
cache_alignment : 128
address sizes : 36 bits physical, 48 bits virtual
power management:
Best,
Uwe
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Message 3 in thread
Hi,
> From my application code, I want to get number of
> physical processors present in system (RHEL & SuSE).
> How do i go about?
>
> sysconf( ) - provides only logical CPUs count, not
> physical CPUs count
This question is not related to Qt. I suggest trying other mailing lists
such as:
http://www.gnu.org/software/libc/resources.html
As far as I know sysconf() is the appropriate API for that. If there's
no macro to retrieve the number of physical CPUs (whatever you mean by
physical count with new multicore processors) then there's probably no
API to retrieve that information from the C library. If so, you need to
get the information directly from the kernel, for example by parsing
/proc/cpuinfo on systems that make it available.
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