如何把PowerShell命令在一个阵列？ [英] How to put powershell commands in an array?

问题描述

我有一个脚本，做了一堆图像处理。到目前为止，依次运行时，仅使用一个核心，永远需要。我手边有四个核心。欲同时运行这些命令中的四个。要做到这一点，我需要把这些命令在数组中。这些是原始的命令：

I have a script that does a bunch of image processing. So far it runs sequentially, uses only one core and takes forever. I have four cores at hand. I want to run four of these commands at the same time. To make this happen, I need to put the commands in an array. These are the original commands:

convert.exe -density 200 -quality 80 -delete 0 -scene 1  C:\Users\mles\Desktop\ta2014\v33_1_21_Northland.pdf C:\Users\mles\Desktop\ta2014\%03d.jpg
convert.exe -density 200 -quality 80 -delete 0 -scene 22 C:\Users\mles\Desktop\ta2014\v33_22_31_Auckland.pdf C:\Users\mles\Desktop\ta2014\%03d.jpg
convert.exe -density 200 -quality 80 -delete 0 -scene 32 C:\Users\mles\Desktop\ta2014\v33_32_49_Waikato.pdf C:\Users\mles\Desktop\ta2014\%03d.jpg
convert.exe -density 200 -quality 80 -delete 0 -scene 50 C:\Users\mles\Desktop\ta2014\v33_50_62_Whanganui.pdf C:\Users\mles\Desktop\ta2014\%03d.jpg
convert.exe -density 200 -quality 80 -delete 0 -scene 63 C:\Users\mles\Desktop\ta2014\v33_63_69_Manawatu.pdf C:\Users\mles\Desktop\ta2014\%03d.jpg
convert.exe -density 200 -quality 80 -delete 0 -scene 70 C:\Users\mles\Desktop\ta2014\v33_70_75_Wellington.pdf C:\Users\mles\Desktop\ta2014\%03d.jpg
convert.exe -density 200 -quality 80 -delete 0 -scene 76 C:\Users\mles\Desktop\ta2014\v33_76_92_Marlborough.pdf C:\Users\mles\Desktop\ta2014\%03d.jpg
convert.exe -density 200 -quality 80 -delete 0 -scene 93 C:\Users\mles\Desktop\ta2014\v33_93_117_Canterbury.pdf C:\Users\mles\Desktop\ta2014\%03d.jpg
convert.exe -density 200 -quality 80 -delete 0 -scene 118 C:\Users\mles\Desktop\ta2014\v33_118_127_Otago.pdf C:\Users\mles\Desktop\ta2014\%03d.jpg
convert.exe -density 200 -quality 80 -delete 0 -scene 128 C:\Users\mles\Desktop\ta2014\v33_128_141_Southland.pdf C:\Users\mles\Desktop\ta2014\%03d.jpg

到目前为止，我想出了这一点：

So far I came up with this:

$array = @()
$array += "convert.exe -density 200 -quality 80 -delete 0 -scene 1  C:\Users\mles\Desktop\ta2014\v33_1_21_Northland.pdf C:\Users\mles\Desktop\ta2014\%03d_test.jpg"
$array += "convert.exe -density 200 -quality 80 -delete 0 -scene 22 C:\Users\mles\Desktop\ta2014\v33_22_31_Auckland.pdf C:\Users\mles\Desktop\ta2014\%03d_test.jpg"
$array += "convert.exe -density 200 -quality 80 -delete 0 -scene 32 C:\Users\mles\Desktop\ta2014\v33_32_49_Waikato.pdf C:\Users\mles\Desktop\ta2014\%03d.jpg"
$array += "convert.exe -density 200 -quality 80 -delete 0 -scene 50 C:\Users\mles\Desktop\ta2014\v33_50_62_Whanganui.pdf C:\Users\mles\Desktop\ta2014\%03d.jpg"
$array += "convert.exe -density 200 -quality 80 -delete 0 -scene 63 C:\Users\mles\Desktop\ta2014\v33_63_69_Manawatu.pdf C:\Users\mles\Desktop\ta2014\%03d.jpg"
$array += "convert.exe -density 200 -quality 80 -delete 0 -scene 70 C:\Users\mles\Desktop\ta2014\v33_70_75_Wellington.pdf C:\Users\mles\Desktop\ta2014\%03d.jpg"
$array += "convert.exe -density 200 -quality 80 -delete 0 -scene 76 C:\Users\mles\Desktop\ta2014\v33_76_92_Marlborough.pdf C:\Users\mles\Desktop\ta2014\%03d.jpg"
$array += "convert.exe -density 200 -quality 80 -delete 0 -scene 93 C:\Users\mles\Desktop\ta2014\v33_93_117_Canterbury.pdf C:\Users\mles\Desktop\ta2014\%03d.jpg"
$array += "convert.exe -density 200 -quality 80 -delete 0 -scene 118 C:\Users\mles\Desktop\ta2014\v33_118_127_Otago.pdf C:\Users\mles\Desktop\ta2014\%03d.jpg"
$array += "convert.exe -density 200 -quality 80 -delete 0 -scene 128 C:\Users\mles\Desktop\ta2014\v33_128_141_Southland.pdf C:\Users\mles\Desktop\ta2014\%03d.jpg"

foreach ($element in $array) {
   $MaxThreads = 4
   While (@(Get-Job | Where { $_.State -eq "Running" }).Count -ge $MaxThreads)
   {  Write-Host "Waiting for open thread...($MaxThreads Maximum)"
      Start-Sleep -Seconds 1
   }

   Start-Job -Scriptblock{ $element }
}

While (@(Get-Job | Where { $_.State -eq "Running" }).Count -ne 0)
{  Write-Host "Waiting for background jobs..."
   Get-Job    #Just showing all the jobs
   Start-Sleep -Seconds 1
}

ForEach ($Job in (Get-Job)) {
   Remove-Job $Job
}

该工作启动，但立即退出。我想这与我在如何存储阵列中的命令办？

The jobs start but quit immediately. I guess it has to do with how I'm storing the commands in the array?

推荐答案

您可能想看看的 但他们撞了针对5个并发进程的最大的工作流程。也有使用运行空间池和PowerShell来实现绕过这个限制的方式，多线程的几个例子。我给了一个工作示例<一个href=\"http://stackoverflow.com/questions/24332039/can-pipelines-run-concurrently-in-the-same-runspace\">here.

You may want to take a look at workflows but they bump up against a max of 5 concurrent processes. There are also several examples of using runspace pools and powershell to implement multi threading in a manner that bypasses this limit. I gave a working example here.

或者只存储scriptblocks作为scriptblocks阵列中，而不是为字符串。

Alternatively just store the scriptblocks as scriptblocks in the array instead of as strings.

$commands = @()
$commands += {echo "test1"}
$commands += {echo "test2"}
$commands += {echo "test3"}
foreach($command in $commands){
    start-job $command
}

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