使用 PowerShell 时间跨度进行算术

发布于 2024-09-16 01:13:52 字数 300 浏览 5 评论 0原文

PowerShell 时间跨度非常适合快速显示持续时间，如下所示：

$starttime = $(get-date)
{ do some processing here }
write-host "Duration: $((new-timespan $starttime $(get-date)).tostring())"

但是，如果我在该时间范围内进行了 $loopcount 次处理迭代，我如何将持续时间除以 $loopcount 以获得每次迭代的平均持续时间？

原文

PowerShell Timespans are great for quickly displaying durations, as in:

$starttime = $(get-date)
{ do some processing here }
write-host "Duration: $((new-timespan $starttime $(get-date)).tostring())"

But if I did $loopcount iterations of processing during that timeframe, how do I divide the duration by $loopcount to get the average duration per iteration?

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疧_╮線 2024-09-23 01:13:52

如果这样做（如果您不需要脚本块的输出），一个稍微好一点的方法可能是：

1..$loopcount | ForEach-Object {
    Measure-Command {
        # do some processing here
    }
} | Measure-Object -Average TotalSeconds

A slightly nicer way if doing this (if you don't need output from your script block) would probably be:

1..$loopcount | ForEach-Object {
    Measure-Command {
        # do some processing here
    }
} | Measure-Object -Average TotalSeconds

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萌面超妹 2024-09-23 01:13:52

到这里，您可以根据需要进行调整。

$StartTime = Get-Date
{ <#do some processing here#> }

$TimeSpan = New-TimeSpan $StartTime (Get-Date)
$AverageTimeSpan = New-TimeSpan -Seconds ($TimeSpan.TotalSeconds / $LoopCount)

秒是为此使用的最佳单位。

Here you go, you can tweak as needed.

$StartTime = Get-Date
{ <#do some processing here#> }

$TimeSpan = New-TimeSpan $StartTime (Get-Date)
$AverageTimeSpan = New-TimeSpan -Seconds ($TimeSpan.TotalSeconds / $LoopCount)

Seconds is the best unit to use for this.

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空宴 2024-09-23 01:13:52

好的，我尝试将其添加为注释，但代码的格式仅限于注释，所以我将其作为另一个答案。

我有类似的需求，但我正在循环一个集合，需要测量集合中每个元素的 2 个不同操作，并希望总结每个操作所需的总时间。

这是我所做的：

$opATot = New-TimeSpan
$opBTot = New-TimeSpan
$myData | %{
   $opA = Measure-Command -Expression { do-op-a $_ }
   $opB = Measure-Command -Expression { do-op-b $_ }
   $opATot = $opATot.add( $opA )
   $opBTot = $opBTot.add( $opB )
}
"Op A took " + $opATot
"Op B took " + $opBTot

Ok, I tried to add this as a comment, but the formatting of the code was just to limited in the comment, so I'll make it as another answer.

I had a similar need, but I was looping over a collection and needing to measure 2 different operations on each element in the collection and wanted to sum up the total time it took for each operation.

Here is what I did:

$opATot = New-TimeSpan
$opBTot = New-TimeSpan
$myData | %{
   $opA = Measure-Command -Expression { do-op-a $_ }
   $opB = Measure-Command -Expression { do-op-b $_ }
   $opATot = $opATot.add( $opA )
   $opBTot = $opBTot.add( $opB )
}
"Op A took " + $opATot
"Op B took " + $opBTot

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