108 lines
2.7 KiB
Go
108 lines
2.7 KiB
Go
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// +build darwin
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// +build cgo
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package cpu
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/*
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#include <stdlib.h>
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#include <sys/sysctl.h>
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#include <sys/mount.h>
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#include <mach/mach_init.h>
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#include <mach/mach_host.h>
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#include <mach/host_info.h>
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#include <libproc.h>
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#include <mach/processor_info.h>
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#include <mach/vm_map.h>
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*/
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import "C"
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import (
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"bytes"
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"encoding/binary"
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"fmt"
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"unsafe"
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)
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// these CPU times for darwin is borrowed from influxdb/telegraf.
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func perCPUTimes() ([]CPUTimesStat, error) {
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var (
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count C.mach_msg_type_number_t
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cpuload *C.processor_cpu_load_info_data_t
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ncpu C.natural_t
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)
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status := C.host_processor_info(C.host_t(C.mach_host_self()),
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C.PROCESSOR_CPU_LOAD_INFO,
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&ncpu,
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(*C.processor_info_array_t)(unsafe.Pointer(&cpuload)),
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&count)
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if status != C.KERN_SUCCESS {
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return nil, fmt.Errorf("host_processor_info error=%d", status)
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}
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// jump through some cgo casting hoops and ensure we properly free
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// the memory that cpuload points to
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target := C.vm_map_t(C.mach_task_self_)
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address := C.vm_address_t(uintptr(unsafe.Pointer(cpuload)))
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defer C.vm_deallocate(target, address, C.vm_size_t(ncpu))
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// the body of struct processor_cpu_load_info
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// aka processor_cpu_load_info_data_t
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var cpu_ticks [C.CPU_STATE_MAX]uint32
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// copy the cpuload array to a []byte buffer
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// where we can binary.Read the data
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size := int(ncpu) * binary.Size(cpu_ticks)
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buf := C.GoBytes(unsafe.Pointer(cpuload), C.int(size))
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bbuf := bytes.NewBuffer(buf)
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var ret []CPUTimesStat
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for i := 0; i < int(ncpu); i++ {
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err := binary.Read(bbuf, binary.LittleEndian, &cpu_ticks)
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if err != nil {
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return nil, err
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}
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c := CPUTimesStat{
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CPU: fmt.Sprintf("cpu%d", i),
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User: float64(cpu_ticks[C.CPU_STATE_USER]) / ClocksPerSec,
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System: float64(cpu_ticks[C.CPU_STATE_SYSTEM]) / ClocksPerSec,
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Nice: float64(cpu_ticks[C.CPU_STATE_NICE]) / ClocksPerSec,
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Idle: float64(cpu_ticks[C.CPU_STATE_IDLE]) / ClocksPerSec,
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}
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ret = append(ret, c)
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}
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return ret, nil
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}
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func allCPUTimes() ([]CPUTimesStat, error) {
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var count C.mach_msg_type_number_t = C.HOST_CPU_LOAD_INFO_COUNT
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var cpuload C.host_cpu_load_info_data_t
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status := C.host_statistics(C.host_t(C.mach_host_self()),
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C.HOST_CPU_LOAD_INFO,
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C.host_info_t(unsafe.Pointer(&cpuload)),
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&count)
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if status != C.KERN_SUCCESS {
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return nil, fmt.Errorf("host_statistics error=%d", status)
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}
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c := CPUTimesStat{
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CPU: "cpu-total",
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User: float64(cpuload.cpu_ticks[C.CPU_STATE_USER]) / ClocksPerSec,
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System: float64(cpuload.cpu_ticks[C.CPU_STATE_SYSTEM]) / ClocksPerSec,
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Nice: float64(cpuload.cpu_ticks[C.CPU_STATE_NICE]) / ClocksPerSec,
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Idle: float64(cpuload.cpu_ticks[C.CPU_STATE_IDLE]) / ClocksPerSec,
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}
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return []CPUTimesStat{c}, nil
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}
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