Swift脚本检索CPU利用率的百分比工作正常，如果运行在一个循环通过计时器,似乎卡住了初始百分比没有计时器

cwdobuhd  于 12个月前  发布在  Swift
关注(0)|答案(1)|浏览(96)

我不是一个swift开发人员。我需要这个swift代码来按需获取当前的CPU利用率百分比。也就是说，每当我查询它时，我都应该获取当前的阅读。我需要从node.js进程运行这个脚本。它基本上就像从终端运行脚本一样。下面是我从另一个SO线程中找到的脚本，它似乎可以正常工作。

import Foundation

// CPU usage credit VenoMKO: https://stackoverflow.com/a/6795612/1033581
class MyCpuUsage {
    var cpuInfo: processor_info_array_t!
    var prevCpuInfo: processor_info_array_t?
    var numCpuInfo: mach_msg_type_number_t = 0
    var numPrevCpuInfo: mach_msg_type_number_t = 0
    var numCPUs: uint = 0
    var updateTimer: Timer!
    let CPUUsageLock: NSLock = NSLock()

    init() {
        let mibKeys: [Int32] = [ CTL_HW, HW_NCPU ]
        // sysctl Swift usage credit Matt Gallagher: https://github.com/mattgallagher/CwlUtils/blob/master/Sources/CwlUtils/CwlSysctl.swift
        mibKeys.withUnsafeBufferPointer() { mib in
            var sizeOfNumCPUs: size_t = MemoryLayout<uint>.size
            let status = sysctl(processor_info_array_t(mutating: mib.baseAddress), 2, &numCPUs, &sizeOfNumCPUs, nil, 0)
            if status != 0 {
                numCPUs = 1
            }
            updateTimer = Timer.scheduledTimer(timeInterval: 3, target: self, selector: #selector(updateInfo), userInfo: nil, repeats: true)
        }
    }

    @objc func updateInfo(_ timer: Timer) {
        var totalInUse: Int32 = 0
        var totalTotal: Int32 = 0
        var numCPUsU: natural_t = 0
        let err: kern_return_t = host_processor_info(mach_host_self(), PROCESSOR_CPU_LOAD_INFO, &numCPUsU, &cpuInfo, &numCpuInfo);
        
        if err == KERN_SUCCESS {
            CPUUsageLock.lock()

            for i in 0 ..< Int32(numCPUs) {
                var inUse: Int32
                var total: Int32
                if let prevCpuInfo = prevCpuInfo {
                    inUse = cpuInfo[Int(CPU_STATE_MAX * i + CPU_STATE_USER)]
                        - prevCpuInfo[Int(CPU_STATE_MAX * i + CPU_STATE_USER)]
                        + cpuInfo[Int(CPU_STATE_MAX * i + CPU_STATE_SYSTEM)]
                        - prevCpuInfo[Int(CPU_STATE_MAX * i + CPU_STATE_SYSTEM)]
                        + cpuInfo[Int(CPU_STATE_MAX * i + CPU_STATE_NICE)]
                        - prevCpuInfo[Int(CPU_STATE_MAX * i + CPU_STATE_NICE)]
                    total = inUse + (cpuInfo[Int(CPU_STATE_MAX * i + CPU_STATE_IDLE)]
                        - prevCpuInfo[Int(CPU_STATE_MAX * i + CPU_STATE_IDLE)])
                } else {
                    inUse = cpuInfo[Int(CPU_STATE_MAX * i + CPU_STATE_USER)]
                        + cpuInfo[Int(CPU_STATE_MAX * i + CPU_STATE_SYSTEM)]
                        + cpuInfo[Int(CPU_STATE_MAX * i + CPU_STATE_NICE)]
                    total = inUse + cpuInfo[Int(CPU_STATE_MAX * i + CPU_STATE_IDLE)]
                }

                totalInUse += inUse
                totalTotal += total
            }
            CPUUsageLock.unlock()

            if let prevCpuInfo = prevCpuInfo {
                // vm_deallocate Swift usage credit rsfinn: https://stackoverflow.com/a/48630296/1033581
                let prevCpuInfoSize: size_t = MemoryLayout<integer_t>.stride * Int(numPrevCpuInfo)
                vm_deallocate(mach_task_self_, vm_address_t(bitPattern: prevCpuInfo), vm_size_t(prevCpuInfoSize))
            }

            prevCpuInfo = cpuInfo
            numPrevCpuInfo = numCpuInfo

            cpuInfo = nil
            numCpuInfo = 0

            let totalUsagePercentage = Float(totalInUse) / Float(totalTotal) * 100
            print(String(format: "Total CPU Usage: %.2f%%", totalUsagePercentage))
        } else {
            print("Error!")
        }
    }
}

let cpuMonitor = MyCpuUsage()
RunLoop.current.run()

字符串
正如你所看到的，这个脚本使用了Timer，并在控制台上每3秒打印一次当前百分比。由于我只想按需打印一次结果，这里是我所做的修改。只是删除了计时器，或者我想我做了。

import Foundation

class MyCpuUsage {
    var cpuInfo: processor_info_array_t!
    var prevCpuInfo: processor_info_array_t?
    var numCpuInfo: mach_msg_type_number_t = 0
    var numPrevCpuInfo: mach_msg_type_number_t = 0
    var numCPUs: uint = 0
    let CPUUsageLock: NSLock = NSLock()

    init() {
        let mibKeys: [Int32] = [ CTL_HW, HW_NCPU ]
        mibKeys.withUnsafeBufferPointer() { mib in
            var sizeOfNumCPUs: size_t = MemoryLayout<uint>.size
            let status = sysctl(processor_info_array_t(mutating: mib.baseAddress), 2, &numCPUs, &sizeOfNumCPUs, nil, 0)
            if status != 0 {
                numCPUs = 1
            }

            // Timer.scheduledTimer(timeInterval: 3, target: self, selector: #selector(updateInfo), userInfo: nil, repeats: true)
            // calling the updateInfo() func to print one time result
            updateInfo()
        }
    }

    // Removed exposure to objective-c and the unused parameter "timer"
    // @objc func updateInfo(_ timer: Timer) {
    func updateInfo() {
        // I have added these two variables to calculate sum of all cores
        var totalInUse: Int32 = 0
        var totalTotal: Int32 = 0

        var numCPUsU: natural_t = 0
        let err: kern_return_t = host_processor_info(mach_host_self(), PROCESSOR_CPU_LOAD_INFO, &numCPUsU, &cpuInfo, &numCpuInfo);
        if err == KERN_SUCCESS {
            CPUUsageLock.lock()

            for i in 0 ..< Int32(numCPUs) {
                var inUse: Int32
                var total: Int32
                if let prevCpuInfo = prevCpuInfo {
                    inUse = cpuInfo[Int(CPU_STATE_MAX * i + CPU_STATE_USER)]
                        - prevCpuInfo[Int(CPU_STATE_MAX * i + CPU_STATE_USER)]
                        + cpuInfo[Int(CPU_STATE_MAX * i + CPU_STATE_SYSTEM)]
                        - prevCpuInfo[Int(CPU_STATE_MAX * i + CPU_STATE_SYSTEM)]
                        + cpuInfo[Int(CPU_STATE_MAX * i + CPU_STATE_NICE)]
                        - prevCpuInfo[Int(CPU_STATE_MAX * i + CPU_STATE_NICE)]
                    total = inUse + (cpuInfo[Int(CPU_STATE_MAX * i + CPU_STATE_IDLE)]
                        - prevCpuInfo[Int(CPU_STATE_MAX * i + CPU_STATE_IDLE)])
                } else {
                    inUse = cpuInfo[Int(CPU_STATE_MAX * i + CPU_STATE_USER)]
                        + cpuInfo[Int(CPU_STATE_MAX * i + CPU_STATE_SYSTEM)]
                        + cpuInfo[Int(CPU_STATE_MAX * i + CPU_STATE_NICE)]
                    total = inUse + cpuInfo[Int(CPU_STATE_MAX * i + CPU_STATE_IDLE)]
                }

                // print(String(format: "Core: %u Usage: %f", i, Float(inUse) / Float(total)))
                // Assigning totals here
                totalInUse += inUse
                totalTotal += total
            }
            CPUUsageLock.unlock()

            if let prevCpuInfo = prevCpuInfo {
                let prevCpuInfoSize: size_t = MemoryLayout<integer_t>.stride * Int(numPrevCpuInfo)
                vm_deallocate(mach_task_self_, vm_address_t(bitPattern: prevCpuInfo), vm_size_t(prevCpuInfoSize))
            }

            prevCpuInfo = cpuInfo
            numPrevCpuInfo = numCpuInfo

            cpuInfo = nil
            numCpuInfo = 0

            let totalUsagePercentage = Float(totalInUse) / Float(totalTotal) * 100

            // This is where I print sum of all cores percentage.
            print(String(format: "Total CPU Usage: %.2f%%", totalUsagePercentage))
        } else {
            print("Error!")
        }
    }
}

let cpuMonitor = MyCpuUsage()

型
我的修改版本的问题是，它似乎在每次调用时打印的百分比与从终端第一次调用时相同。不仅控制台上的打印值保持不变，而且我还尝试运行进程以增加CPU使用率，并通过Activity Monitor确认，但此脚本仍然显示相同的值。任何帮助都将不胜感激。
这是终端的截图。


的数据


的

swift

1条答案

按热度按时间
wh6knrhe

wh6knrhe1#

原始程式码（in 2011）中的公式依赖于两次host_processor_info呼叫之间的用法差异。因此，若要让您的想法在没有计时器的情况下运作，您仍然需要至少两次updateInfo()呼叫。例如，您可以尝试在两者之间使用sleep(1)秒。
程式码已加上注解。
在SwiftPlayground进行测试。

import Foundation

class MyCpuUsage {
    var cpuInfo: processor_info_array_t!
    var prevCpuInfo: processor_info_array_t?
    var numCpuInfo: mach_msg_type_number_t = 0
    var numPrevCpuInfo: mach_msg_type_number_t = 0
    let numCPUs: uint
    let CPUUsageLock = NSLock()

    init() {
        // obtaining numCPUs
        let mibKeys: [Int32] = [ CTL_HW, HW_NCPU ]
        var numCPUs: uint = 0
        mibKeys.withUnsafeBufferPointer() { mib in
            var sizeOfNumCPUs = MemoryLayout<uint>.size
            let status = sysctl(processor_info_array_t(mutating: mib.baseAddress), 2, &numCPUs, &sizeOfNumCPUs, nil, 0)
            if status != 0 {
                numCPUs = 1
            }
        }
        self.numCPUs = numCPUs

        // calling the updateInfo() func to initialize prevCpuInfo
        updateInfo()
        // sleep 1 second
        sleep(1)
        // calling the updateInfo() func to print cpu usage during past second
        updateInfo()
    }

    func updateInfo() {
        var numCPUsU: natural_t = 0
        let err: kern_return_t = host_processor_info(mach_host_self(), PROCESSOR_CPU_LOAD_INFO, &numCPUsU, &cpuInfo, &numCpuInfo);
        guard err == KERN_SUCCESS else {
            print("Error host_processor_info!")
            return
        }

        // Two variables to calculate sum of all cores
        var totalInUse: Int32 = 0
        var totalTotal: Int32 = 0

        CPUUsageLock.lock()

        for i in 0 ..< Int32(numCPUs) {
            var inUse: Int32
            var total: Int32
            if let prevCpuInfo = prevCpuInfo {
                inUse = cpuInfo[Int(CPU_STATE_MAX * i + CPU_STATE_USER)]
                    - prevCpuInfo[Int(CPU_STATE_MAX * i + CPU_STATE_USER)]
                    + cpuInfo[Int(CPU_STATE_MAX * i + CPU_STATE_SYSTEM)]
                    - prevCpuInfo[Int(CPU_STATE_MAX * i + CPU_STATE_SYSTEM)]
                    + cpuInfo[Int(CPU_STATE_MAX * i + CPU_STATE_NICE)]
                    - prevCpuInfo[Int(CPU_STATE_MAX * i + CPU_STATE_NICE)]
                total = inUse + (cpuInfo[Int(CPU_STATE_MAX * i + CPU_STATE_IDLE)]
                    - prevCpuInfo[Int(CPU_STATE_MAX * i + CPU_STATE_IDLE)])
            } else {
                inUse = cpuInfo[Int(CPU_STATE_MAX * i + CPU_STATE_USER)]
                    + cpuInfo[Int(CPU_STATE_MAX * i + CPU_STATE_SYSTEM)]
                    + cpuInfo[Int(CPU_STATE_MAX * i + CPU_STATE_NICE)]
                total = inUse + cpuInfo[Int(CPU_STATE_MAX * i + CPU_STATE_IDLE)]
            }

            // Assigning totals here
            totalInUse += inUse
            totalTotal += total
        }
        CPUUsageLock.unlock()

        if let prevCpuInfo = prevCpuInfo {
            // I free the memory of prevCpuInfo
            let prevCpuInfoSize: size_t = MemoryLayout<integer_t>.stride * Int(numPrevCpuInfo)
            vm_deallocate(mach_task_self_, vm_address_t(bitPattern: prevCpuInfo), vm_size_t(prevCpuInfoSize))
            
            // I print sum of all cores percentage.
            let totalUsagePercentage = Float(totalInUse) / Float(totalTotal) * 100
            print(String(format: "Total CPU Usage: %.2f%%", totalUsagePercentage))
        }

        prevCpuInfo = cpuInfo
        numPrevCpuInfo = numCpuInfo

        cpuInfo = nil
        numCpuInfo = 0
    }
}

let cpuMonitor = MyCpuUsage()

字符串
为了记录在案，Anya在2013年的similar ObjC answer中也记录了在两次调用之间等待1秒的想法：
然后我们取两个样本（样本之间间隔1秒）

sample(&sample1);
sleep(1);
sample(&sample2);

型

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