Powershell 3.0 - 工作流 - 限制并行执行的数量 [英] Powershell 3.0 - Workflows - Limit number of parallel execution

问题描述

我正在从模板克隆 ESX 服务器上的虚拟机.简化代码如下所示:

I am cloning VMs on ESX server from template. Simplified code looks like this:

Workflow Create-VM {
  $List = 1..500
  foreach -parallel ($Elem in $List)
  {
      # Create VM ...
      # Configure created VM ..
  }
}

Create-VM

并行执行真的很有帮助.不幸的是，在这种情况下效果不佳.生成了太多的并行请求.我需要将并行执行的数量限制为较小的数量(例如 4).

Parallel execution is really helpful. Unfortunately in this case doesn't work pretty well. Too many parallel request are generated. I need to limit number of parallel execution to smaller number (for example 4).

我试图更改本地会话配置(SessionThrottleLimit、MaxSessionsPerWorkflow、MaxRunningWorkflows)http://technet.microsoft.com/en-us/library/hh849862.aspx.

I was trying to change local Session Configuration (SessionThrottleLimit, MaxSessionsPerWorkflow, MaxRunningWorkflows) http://technet.microsoft.com/en-us/library/hh849862.aspx.

$WWE = New-PSWorkflowExecutionOption  -SessionThrottleLimit 4
Set-PSSessionConfiguration -Name microsoft.powershell.workflow `
   -SessionTypeOption $WWE 
Get-PSSessionConfiguration microsoft.powershell.workflow | 
fl SessionThrottleLimit

问题

• 我应该更改会话配置的哪个参数(或组合)，以将并行执行的数量限制为 4?
• 是否还有其他方法可以实现这一点(例如:执行工作流的不同方式...)?

推荐答案

有一个选项可以使用 -throttlelimit N 来限制 foreach-parallel 循环中并行进程的数量.这对于减少并行度非常有用，但是如果您尝试大量的数量，系统可能仍会将您限制为 5，具体取决于您的所有软件版本(是的！Microsoft 一致性).我知道这个问题很老，但由于它在谷歌上出现而没有一个像样的答案，我想我会插话.

There is an option to limit the number of parallel processes in a foreach-parallel loop using -throttlelimit N. It's great for reducing the parallelism, but if you try a high number the system may still limit you to 5, depending on all your software versions (YAY! Microsoft consistency). I know the question is old, but since it came up on Google without a decent answer, I thought I'd chime in.

Workflow Create-VM {
  $List = 1..500
  foreach -parallel -throttlelimit 4 ($Elem in $List)
  {
      # Create VM ...
      # Configure created VM ..
  }
}

Create-VM

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