Powershell命令超时 [英] Powershell command timeout

问题描述

我正在尝试在Powershell中执行功能或脚本块，并为执行设置超时.

I am trying to execute a function or a scriptblock in powershell and set a timeout for the execution.

基本上我有以下内容(转换为伪代码):

Basically I have the following (translated into pseudocode):

function query{
    #query remote system for something
}

$computerList = Get-Content "C:\scripts\computers.txt"

foreach ($computer in $computerList){
    $result = query
    #do something with $result
}

该查询的范围可以从使用Get-WmiObject的WMI查询到HTTP请求，并且脚本必须在混合环境中运行，包括Windows和Unix机器(均不具有HTTP接口). 因此，某些查询必然会挂起或花费很长时间才能返回. 在追求优化的过程中，我写了以下内容:

The query can range from a WMI query using Get-WmiObject to a HTTP request and the script has to run in a mixed environment, which includes Windows and Unix machines which do not all have a HTTP interface. Some of the queries will therefore necessarily hang or take a VERY long time to return. In my quest for optimization I have written the following:

$blockofcode = {
    #query remote system for something
}

foreach ($computer in $computerList){
    $Job = Start-Job -ScriptBlock $blockofcode -ArgumentList $computer
    Wait-Job $Job.ID -Timeout 10 | out-null
    $result = Receive-Job $Job.ID
    #do something with result
}

但是不幸的是，工作似乎要承担很多开销.在我的测试中，以1.066秒(根据$ blockofcode中的计时器)执行的查询在作为Job执行时花了6.964秒才能返回结果.当然可以，但是我真的想减少这些开销.我也可以一起开始所有工作，然后等待它们完成，但是这些工作仍然可能会挂起或花很多时间来完成.

But unfortunately jobs seem to carry a LOT of overhead. In my tests a query that executes in 1.066 seconds (according to timers inside $blockofcode) took 6.964 seconds to return a result when executed as a Job. Of course it works, but I would really like to reduce that overhead. I could also start all jobs together and then wait for them to finish, but the jobs can still hang or take ridiculous amounts to time to complete.

那么，问题来了:有什么方法可以执行一个语句，函数，脚本块甚至是一个脚本，但其超时时间不包括作业所带来的开销?如果可能的话，我想并行运行命令，但这不是一个大问题.

So, on to the question: is there any way to execute a statement, function, scriptblock or even a script with a timeout that does not comprise the kind of overhead that comes with jobs? If possible I would like to run the commands in parallel, but that is not a deal-breaker.

任何帮助或提示将不胜感激！

Any help or hints would be greatly appreciated!

在混合的Windows/unix环境中运行Powershell V3

running powershell V3 in a mixed windows/unix environment

推荐答案

我认为您可能想使用Powershell运行空间进行调查:

I think you might want to investigate using Powershell runspaces:

http ://learn-powershell.net/2012/05/13/using-background-runspaces-instead-of-psjobs-for-better-performance/

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