C++: How to Get Per-Core CPU Usage in Mac

C++: Mac環境でコア単位のCPU使用率を測定する

 

環境

• OS X: 10.9

 

コード

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#include <stdio.h> #include <unistd.h> #include <mach/mach_host.h> #include <mach/processor_info.h> #include <iostream>   using namespace std;   class CpuUsage {  public:   CpuUsage(int core): core_(core) {     prev = updated_ticks_(core);   }     float get() {     Ticks t = updated_ticks_(core_);     unsigned long long int used = t.used() - prev.used();     unsigned long long int total = t.total() - prev.total();     prev = t;     return (float)used / (float)total * 100.0f;   }    private:   struct Ticks {     unsigned long long int usertime;     unsigned long long int nicetime;     unsigned long long int systemtime;     unsigned long long int idletime;       unsigned long long int used() { return usertime + nicetime + systemtime; }     unsigned long long int total() { return usertime + nicetime + systemtime + idletime; }   } prev;     int core_;     Ticks updated_ticks_(int core) {     unsigned int cpu_count;     processor_cpu_load_info_t cpu_load;     mach_msg_type_number_t cpu_msg_count;       int rc =  host_processor_info(       mach_host_self( ),       PROCESSOR_CPU_LOAD_INFO,       &cpu_count,       (processor_info_array_t *) &cpu_load,       &cpu_msg_count     );     if (rc != 0) {       printf("Error: failed to scan processor info (rc=%d)\n", rc);       exit(1);     }       if (core < 0 || cpu_count <= core) {       printf("Error: invalid core number: %d\n", core);       exit(1);     }     unsigned long long int usertime = cpu_load[core].cpu_ticks[CPU_STATE_USER];     unsigned long long int nicetime = cpu_load[core].cpu_ticks[CPU_STATE_NICE];     unsigned long long int systemtime = cpu_load[core].cpu_ticks[CPU_STATE_SYSTEM];     unsigned long long int idletime = cpu_load[core].cpu_ticks[CPU_STATE_IDLE];       Ticks t = {usertime, nicetime, systemtime, idletime};     return t;   }   };   int main() {   CpuUsage a(0), b(1), c(2), d(3);   sleep(1);   printf("%6.2f, %6.2f, %6.2f, %6.2f\n", a.get(), b.get(), c.get(), d.get());   sleep(1);   printf("%6.2f, %6.2f, %6.2f, %6.2f\n", a.get(), b.get(), c.get(), d.get());   sleep(1);   printf("%6.2f, %6.2f, %6.2f, %6.2f\n", a.get(), b.get(), c.get(), d.get());   return 0; }

(need improvement)

 

実行例

78.00,  72.73,  85.00,  72.00 78.00,  57.00,  72.00,  56.57 82.00,  83.00,  90.00,  88.00

 

 

References

• htop-osx/ProcessList.c at master · max-horvath/htop-osx