cpu.hpp

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#ifndef JOIN_CORE_CPU_HPP
#define JOIN_CORE_CPU_HPP
 
// C++.
#include <string>
#include <vector>
 
// C.
#include <cstdint>
 
namespace join
{
    struct LogicalCpu
    {
        int id;     
        int core;   
        int socket; 
        int numa;   
    };
 
    struct PhysicalCore
    {
        int id;                          
        int socket;                      
        int numa;                        
        std::vector<LogicalCpu> threads; 
        int primaryThread () const noexcept
        {
            return threads.empty () ? -1 : threads[0].id;
        }
    };
 
    struct NumaNode
    {
        int id;                 
        std::vector<int> cores; 
    };
 
    class CpuTopology
    {
    public:
        static const CpuTopology* instance ();
 
        CpuTopology (const CpuTopology& other) = delete;
 
        CpuTopology& operator= (const CpuTopology& other) = delete;
 
        const std::vector<PhysicalCore>& cores () const noexcept;
 
        const std::vector<NumaNode>& nodes () const noexcept;
 
#ifdef DEBUG
        void dump () const;
#endif
 
    private:
        CpuTopology ();
 
        ~CpuTopology () = default;
 
        static int readInt (const std::string& path);
 
        static int findNuma (const std::string& cpuPath);
 
        void detect ();
 
        std::vector<PhysicalCore> _cores;
 
        std::vector<NumaNode> _nodes;
    };
}
 
#endif