计算程序步骤

Question

我有一个带有许多循环的“大型”vba 程序，现在我想计算程序启动时各个命令执行的每个步骤，所以也许我可以找到性能不高的循环。我想要执行一些步骤。

有人知道这是如何运作的吗？或者在 Excel 2010 中是否已经存在一些函数？

谢谢。我知道我的英语不是很好。

编辑 2013 年 14 月 6 日：
现在我在我的模块中这样写

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

该类正确地称为秒表，我不知道有什么缺陷。

Answer 1

如果您的意思是“计算处理器指令的数量”，则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。有关使用 Windows API 函数 QueryPerformanceCounter 在 VBA 中构建超精确秒表的详细说明，请参阅我的文章 VBA 中的精确性能计时器。这是 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

将上述代码粘贴到一个新的类模块中，并将该模块命名为“Stopwatch”。然后在代码的其他任何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