PowerShell:计算每个计数器的rawvalue属性的连续值之间的增量

Question

'vening，

我是PowerShell脚本的新手(也是这个网站的新手)，需要写一个脚本：

• 多次收集性能计数器(在本例中为TCP)
• 计算每个计数器的rawvalue属性的连续值之间的差

规定脚本在每个间隔T迭代性能计数器N次，所述性能计数器为"A"one_answers"B"，并且我们从0开始计数，它需要执行以下计算：

A[1st] - A[0th], 
A[2nd] - A[1st], 
A[3rd] - A[2nd]
...  

目前，脚本只遍历计数器两次(即，在这种情况下N=2)。目标是能够"多次"(例如几百次)迭代这些计数器。

当前，脚本将每个计数器的原始值读取到单个数组中。这是：

$cntr = (get-counter -listset tcpv4).paths
$arry = @()
for ($i=0; $i -lt 2; $i++) {
write-host "`nThis is iteration $i`n"
foreach ($elmt in $cntr) {
$z = (get-counter -counter $elmt).countersamples[0].rawvalue
$arry = $arry + $z
write-host "$elmt is: $z`n"
}
}

当我运行这个脚本时，我得到的输出如下：

This is iteration 0
TCPv4Segments/sec is: 24723
TCPv4Connections Established is: 27
TCPv4Connections Active is: 796
TCPv4Connections Passive is: 47
TCPv4Connection Failures is: 158
TCPv4Connections Reset is: 412
TCPv4Segments Received/sec is: 14902
TCPv4Segments Sent/sec is: 9822
TCPv4Segments Retransmitted/sec is: 199

This is iteration 1
TCPv4Segments/sec is: 24727
TCPv4Connections Established is: 27
TCPv4Connections Active is: 798
TCPv4Connections Passive is: 47
TCPv4Connection Failures is: 159
TCPv4Connections Reset is: 412
TCPv4Segments Received/sec is: 14903
TCPv4Segments Sent/sec is: 9824
TCPv4Segments Retransmitted/sec is: 200

例如，"\TCPv4\ Segments Retransmitted/sec"计数器的rawvalue属性的两个值分别为$arry[8]和$arry[17]。为了得出两者之间的差异，我正在使用：

write-host "The difference between the successive counters for $($cntr[-1]) is $($($arry[17]) - $($arry[8]))."

如有任何帮助，我们将不胜感激。

Answer 1

我戳了一下，结果出来了：

$cntr = (get-counter -listset tcpv4).paths
$LastValue = @{}
Get-Counter $cntr -SampleInterval 2 -MaxSamples 5 |
foreach {
foreach ($Sample in $_.CounterSamples)
{
$ht = [Ordered]@{
Counter   = $Sample.path.split('')[-1]
TimeStamp = $_.TimeStamp
RawValue  = $Sample.RawValue
LastValue = $LastValue[$Sample.Path]
Change    = $Sample.RawValue - $LastValue[$Sample.Path]
}
if ($LastValue.ContainsKey($Sample.path))
{ [PSCustomObject]$ht }
$LastValue[$Sample.Path] = $Sample.RawValue
}
} 

编辑：

这应该适用于V2:

$cntr = (get-counter -listset tcpv4).paths
$LastValue = @{}
Get-Counter $cntr -SampleInterval 10 -MaxSamples 3 |
foreach {
foreach ($Sample in $_.CounterSamples)
{
$Object = '' | 
Select-Object Counter,TimeStamp,RawValue,LastValue,Change
$Object.Counter   = $Sample.path.split('')[-1]
$Object.TimeStamp = $_.TimeStamp
$Object.RawValue  = $Sample.RawValue
$Object.LastValue = $LastValue[$Sample.Path]
$Object.Change    = $Sample.RawValue - $LastValue[$Sample.Path]
if ($LastValue.ContainsKey($Sample.path))
{ $Object }
$LastValue[$Sample.Path] = $Sample.RawValue
}
} 

Answer 2

好的。好吧，让我们处理这个然后

$cntr = (get-counter -listset tcpv4).paths
$arry = @()
$maximumIterations = 2  # Variable based since you intended to change this. 
# Cycle the counters while recording the values. Once completed we will calculate change.
for ($i=1; $i -le $maximumIterations; $i++) {
foreach ($elmt in $cntr) {
$arry += New-Object -TypeName PsCustomObject -Property @{
Iteration = $i
Counter = $elmt
RawValue = (get-counter -counter $elmt).countersamples[0].rawvalue
Change = $null
}
}
}
# Now that we have all the values lets calculate the rate of change over each iteration.
$arry | Where-Object{$_.Iteration -gt 1} | ForEach-Object{
$previousIteration = $_.Iteration - 1 
$thisCounter = $_.Counter
$thisValue = $_.RawValue
$previousValue = ($arry | Where-Object{$_.Counter -eq $thisCounter -and $_.Iteration -eq $previousIteration}).RawValue
$_.Change = $thisValue - $previousValue
}
$arry | Select Iteration,Counter,RawValue,Change

并不是说我们有，而是我收集了所有计数器数据及其迭代值，就像你对Write-Host所做的那样。你会注意到我为Change创建了一个占位符，但没有填充它。在计算之前，$arry会有如下数据。注：输出被截断

Iteration Change Counter                           RawValue
--------- ------ -------                           --------
1        TCPv4Segments/sec               28324837
1        TCPv4Connections Established         120
.        ..............................       .....
2        TCPv4Segments/sec               28325441
2        TCPv4Connections Established         125

一旦所有这些数据都被收集到$arry中，我们就会得到所有不是第一次的迭代，并单独处理每个项目。使用管道中当前项的数据，我们将其与以前的迭代值进行匹配。使用与上面相同的值，我们得到了您希望监控的更改

Iteration Counter                           RawValue Change
--------- -------                           -------- ------
1 TCPv4Segments/sec               28324837       
1 TCPv4Connections Established         120 
. ..............................       .....         
2 TCPv4Segments/sec               28325441 604   
2 TCPv4Connections Established         125 5