[fpc-devel] Feature announcement: Extension of TThread's interface
ewald at yellowcouch.org
Fri Dec 28 16:00:22 CET 2012
Once upon a time, on 12/28/2012 11:01 AM to be precise, patspiper said:
> On 27/12/12 22:38, Ewald wrote:
>> Hmmm, that;s indeed quite some different output you've got there.
>> Mine looks like this:
>> processor : 0
>> vendor_id : GenuineIntel
>> cpu family : 6
>> model : 23
>> model name : Intel(R) Core(TM)2 Duo CPU E8600 @ 3.33GHz
>> stepping : 10
>> microcode : 0xa07
>> cpu MHz : 2000.000
>> cache size : 6144 KB
>> physical id : 0
>> siblings : 2
>> core id : 0
>> cpu cores : 2
>> apicid : 0
>> initial apicid : 0
>> fpu : yes
>> fpu_exception : yes
>> cpuid level : 13
>> 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 pbe syscall nx lm constant_tsc arch_perfmon pebs bts
>> rep_good nopl aperfmperf pni dtes64 monitor ds_cpl vmx smx est
>> tm2 ssse3 cx16 xtpr pdcm sse4_1 xsave lahf_lm dtherm tpr_shadow
>> vnmi flexpriority
>> bogomips : 6668.63
>> clflush size : 64
>> cache_alignment : 64
>> address sizes : 36 bits physical, 48 bits virtual
>> power management:
>> (this is repeated twice, with only `processor:0` changing to
>> Since this is the same kind of output I got on several other linux
>> distributions/architectures(--> 32 bit versus 64 bit intel), I
>> assumed it was kinda `standard`. Then again assume = ...
>> Well, anyway, it's a bit trickier than I thought at first in that case.
> I guess one way of calculating the number of processors is to iterate
> through every 'processor' in the list and add 1 if 'siblings' = 'cpu
> cores' (no hyperthreading), and 0.5 if 'siblings' = 2 x 'cpu cores'
> (hyperthreading enabled).
Yeah, that could work, but then again the actual format of the data may
be different measured over several distributions: suppose all `:` all of
the sudden become `=`? Suppose that an identifier like `processor`
undergoes a slicht namechange to `processorid`?
As I said, I didn't know formats of /proc/cpuinfo differ over
distributions/os'es, so it isn't safe to use this approach since all of
the sudden a simly system update *might* just break your application.
> Despite your listing of cpuinfo is partial, one can deduce that you
> don't have hyperthreading.
Quite right. :-)
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