计算程序步骤

Question

我有一个带有许多循环的“大型”vba 程序，现在我想计算我的程序在启动它时执行的各个命令的每一步，所以也许我可以找到性能不高的循环。我想要一些已执行的步骤。

现在有人知道它是如何工作的吗？还是在Excel2010中已经存在一些功能？

谢谢。我知道我的英语不是很好。 >.

编辑 06.14.13 现在我把它写在我的模块中

Sub DoStuff()
Dim sw As New Stopwatch
sw.Start
Call pranlesen.plan_gen
sw.Pause
Debug.Print "SomeFunction took " & format(sw.Elapsed * 1000, "0.000000") & " milliseconds"
End Sub

这个类是正确的称为秒表我不知道是什么缺陷。

Answer 1

如果您的意思是“计算处理器指令的数量”，那么没有办法做到这一点。但是，您可以非常准确地测量经过的时间。在 VBA 中使用 Windows API 函数QueryPerformanceCounter 构造超精确秒表的详细说明见我的文章Accurate Performance Timers in VBA。下面是 Stopwatch 类的完整代码：

Option Explicit

Private Declare Function QueryPerformanceCounter Lib "kernel32" ( _
    lpPerformanceCount As UINT64) As Long
Private Declare Function QueryPerformanceFrequency Lib "kernel32" ( _
    lpFrequency As UINT64) As Long

Private pFrequency As Double
Private pStartTS As UINT64
Private pEndTS As UINT64
Private pElapsed As Double
Private pRunning As Boolean

Private Type UINT64
    LowPart As Long
    HighPart As Long
End Type

Private Const BSHIFT_32 = 4294967296# ' 2 ^ 32

Private Function U64Dbl(U64 As UINT64) As Double
    Dim lDbl As Double, hDbl As Double
    lDbl = U64.LowPart
    hDbl = U64.HighPart
    If lDbl < 0 Then lDbl = lDbl + BSHIFT_32
    If hDbl < 0 Then hDbl = hDbl + BSHIFT_32
    U64Dbl = lDbl + BSHIFT_32 * hDbl
End Function

Private Sub Class_Initialize()
    Dim PerfFrequency As UINT64
    QueryPerformanceFrequency PerfFrequency
    pFrequency = U64Dbl(PerfFrequency)
End Sub

Public Property Get Elapsed() As Double
    If pRunning Then
        Dim pNow As UINT64
        QueryPerformanceCounter pNow
        Elapsed = pElapsed + (U64Dbl(pNow) - U64Dbl(pStartTS)) / pFrequency
    Else
        Elapsed = pElapsed
    End If
End Property

Public Sub Start()
    If Not pRunning Then
        QueryPerformanceCounter pStartTS
        pRunning = True
    End If
End Sub

Public Sub Pause()
    If pRunning Then
        QueryPerformanceCounter pEndTS
        pRunning = False
        pElapsed = pElapsed + (U64Dbl(pEndTS) - U64Dbl(pStartTS)) / pFrequency
    End If
End Sub

Public Sub Reset()
    pElapsed = 0
    pRunning = False
End Sub

Public Sub Restart()
    pElapsed = 0
    QueryPerformanceCounter pStartTS
    pRunning = True
End Sub

Public Property Get Running() As Boolean
   Running = pRunning
End Property

将上述代码粘贴到新的 Class 模块中，并将模块命名为“Stopwatch”。然后在你的代码中的任何其他地方你都可以做这样的事情：

Sub DoStuff
    Dim sw As New Stopwatch
    sw.Start
    myResult = SomeFunction(A, B, C)
    sw.Pause
    Debug.Print "SomeFunction took " & Format(sw.Elapsed * 1000, "0.000000") & " milliseconds"
End Sub