Cpuinfo mac how to#
Cpuinfo mac 64 Bit#
Cpuinfo mac mac#

Process at this level | Reserved |ĮCX | Level No. The particular CPUID reference that provides information needed to building the topology is 0xB (11) - the extended topology enumeration leaf. The CPUID instruction takes 2 parameters, one in EAX and one in ECX. The 3rd and final section are the input parameters. The '=a' refers to the 2nd letter of the register designation. The snippet '=a' (data) means store the result in the EAX register in the variable data. The second line defines the output parameters. The first part is the instruction to be executed. An inline asm segment consists of 3 parts.

Cpuinfo mac 64 Bit#

The ones used for the CPUID instruction are EAX, EBX, ECX, and EDX (referenced as RAX, RBX, etc if using 64 bit instructions via the REX extension).

Cpuinfo mac mac#

On my Mac I get the following: // Output:įor those unfamiliar with Intel inline assembly, the Intel CPU defines a number of registers.

Cpuinfo mac how to#

The code shows how to get the vendor string from the CPU.

To access the CPUID instruction we need a little bit of inline assembler. hyperthreading) to sizes of the various levels of cache and the associated cache lines. There is a raft of information available from listing of the CPU features available (e.g. The is the primary mechanism for getting information about the CPU. Intel exposes an instruction called CPUID. The first step was to understand what information was available from the CPU. Not only did it require getting down and dirty with a bit of C++ and X86 Assembly, it also required writing a MacOS kernel extension. While this sounds very simple, it's actually fraught with a number of little niggles. I need to map the operating system's processors to hardware threads, then build a picture of which cores and sockets those threads reside. Specifically I needed to build a topology of the CPUs on a given system. To find out the CPU cores, run top command and press '1' (Number one) to get the CPU core details.Within a project I've been working on I've had the need to simulate the capabilities of Linux's /proc/cpuinfo on Mac OS. The top command is used to display the dynamic real-time view of all running processes in your system. Model name: Intel(R) Core(TM) i3-2350M CPU 2.30GHzįlags: 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 rdtscp lm constant_tsc arch_perfmon pebs bts rep_good nopl xtopology nonstop_tsc cpuid aperfmperf pni pclmulqdq dtes64 monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr pdcm pcid sse4_1 sse4_2 x2apic popcnt tsc_deadline_timer xsave avx lahf_lm epb tpr_shadow vnmi flexpriority ept vpid xsaveopt dtherm arat pln pts 3. The ' lscpu' command is used to display the information about your CPU in human-readable format. The lscpu command is part of the util-linux package, so don't bother about installation. To display the number of cores in your system, open up your Terminal and run the following command: $ nprocĪs you see in the above example, my processor is 4-core type. It is part of GNU Core utils, so it comes pre-installed with all modern Linux operating systems. The nproc is a simple Unix command to print the number of processing units available in your system.