How to detect the count of P & E cores in Intel CPUs?

Question

How to detect the count of P & E cores in Intel CPUs?

yusuf 0

Is there a programmatic way to detect the current P & E cores?

The Intel® Processor Identification Utility for the Intel® Core™ 12th generation and newer shows the number of the P-Cores and E-Cores in the system.

https://www.intel.com/content/www/us/en/support/articles/000097881/processors.html#:~:text=Use%20the%20Intel%C2%AE%20Processor,12th%20generation%20and%20newer%20processors.

Please help me for how to detect the same in a programmatical way.

Viorel 121.4K Reputation points

2025-03-28T14:56:39.95+00:00

Maybe you can use the __cpuid intrinsic function in C++ with function_id=0x07 to determine if processor is a hybrid part, then with function_id=0x1A to determine the Core Type Flag according to https://www.intel.com/content/www/us/en/developer/articles/guide/12th-gen-intel-core-processor-gamedev-guide.html (“CPUID Intrinsic”). To run it on specific processor, probably the SetThreadAffinityMask can be used.

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Viorel 121.4K Reputation points

2025-03-28T14:56:39.95+00:00

Maybe you can use the __cpuid intrinsic function in C++ with function_id=0x07 to determine if processor is a hybrid part, then with function_id=0x1A to determine the Core Type Flag according to https://www.intel.com/content/www/us/en/developer/articles/guide/12th-gen-intel-core-processor-gamedev-guide.html (“CPUID Intrinsic”). To run it on specific processor, probably the SetThreadAffinityMask can be used.

Answer 1

The GetLogicalProcessorInformationEx function returns a struct SYSTEM_LOGICAL_PROCESSOR_INFORMATION_EX, which has an EfficiencyClass member. This is the info for the EfficiencyClass member:

If the Relationship member of the SYSTEM_LOGICAL_PROCESSOR_INFORMATION_EX structure is RelationProcessorCore, EfficiencyClass specifies the intrinsic tradeoff between performance and power for the applicable core. A core with a higher value for the efficiency class has intrinsically greater performance and less efficiency than a core with a lower value for the efficiency class. EfficiencyClass is only nonzero on systems with a heterogeneous set of cores.

It may be possible to obtain P and E core counts by using this information.

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How to detect the count of P & E cores in Intel CPUs?

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