mirror of
https://github.com/shirou/gopsutil.git
synced 2025-04-26 13:48:59 +08:00
13e00c76e4
Before this change we used to exec() various binaries to find out memory information. While this worked, it was awfully slow. And if somebody would want to compute how many percent of available memory all PIDs on the system uses, that would take almost ten seconds on my laptop with the previous implementation. This implementation fares a lot better, and is smaller.
112 lines
2.5 KiB
Go
112 lines
2.5 KiB
Go
// +build darwin
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package mem
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/*
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#include <unistd.h>
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#include <mach/mach_host.h>
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*/
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import "C"
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import (
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"fmt"
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"os/exec"
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"strconv"
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"strings"
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"unsafe"
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"github.com/shirou/gopsutil/internal/common"
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)
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func getPageSize() (uint64, error) {
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out, err := exec.Command("pagesize").Output()
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if err != nil {
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return 0, err
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}
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o := strings.TrimSpace(string(out))
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p, err := strconv.ParseUint(o, 10, 64)
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if err != nil {
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return 0, err
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}
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return p, nil
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}
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// VirtualMemory returns VirtualmemoryStat.
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func VirtualMemory() (*VirtualMemoryStat, error) {
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count := C.mach_msg_type_number_t(C.HOST_VM_INFO_COUNT)
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var vmstat C.vm_statistics_data_t
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status := C.host_statistics(C.host_t(C.mach_host_self()),
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C.HOST_VM_INFO,
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C.host_info_t(unsafe.Pointer(&vmstat)),
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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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totalCount := vmstat.wire_count +
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vmstat.active_count +
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vmstat.inactive_count +
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vmstat.free_count
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availableCount := vmstat.inactive_count + vmstat.free_count
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usedPercent := 100 * float64(totalCount-availableCount) / float64(totalCount)
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usedCount := totalCount - vmstat.free_count
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pageSize := uint64(C.getpagesize())
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return &VirtualMemoryStat{
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Total: pageSize * uint64(totalCount),
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Available: pageSize * uint64(availableCount),
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Used: pageSize * uint64(usedCount),
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UsedPercent: usedPercent,
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Free: pageSize * uint64(vmstat.free_count),
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Active: pageSize * uint64(vmstat.active_count),
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Inactive: pageSize * uint64(vmstat.inactive_count),
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Wired: pageSize * uint64(vmstat.wire_count),
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}, nil
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}
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// SwapMemory returns swapinfo.
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func SwapMemory() (*SwapMemoryStat, error) {
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var ret *SwapMemoryStat
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swapUsage, err := common.DoSysctrl("vm.swapusage")
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if err != nil {
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return ret, err
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}
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total := strings.Replace(swapUsage[2], "M", "", 1)
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used := strings.Replace(swapUsage[5], "M", "", 1)
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free := strings.Replace(swapUsage[8], "M", "", 1)
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total_v, err := strconv.ParseFloat(total, 64)
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if err != nil {
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return nil, err
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}
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used_v, err := strconv.ParseFloat(used, 64)
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if err != nil {
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return nil, err
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}
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free_v, err := strconv.ParseFloat(free, 64)
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if err != nil {
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return nil, err
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}
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u := float64(0)
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if total_v != 0 {
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u = ((total_v - free_v) / total_v) * 100.0
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}
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// vm.swapusage shows "M", multiply 1000
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ret = &SwapMemoryStat{
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Total: uint64(total_v * 1000),
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Used: uint64(used_v * 1000),
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Free: uint64(free_v * 1000),
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UsedPercent: u,
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}
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return ret, nil
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}
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