PoshRsJob性能问题

Question

为什么在PowerShell中使用多线程的速度如此之慢？我做错什么了吗？我正在使用PoshRsJob模块。

RSJobs：

(Measure-Command {

    $output = Start-RSJob -InputObject $shortDump -ScriptBlock {
        Param($out, $shortDump)

        $retObj = [pscustomobject]@{
            UserMail = $_.Mail
            Type = $_.Type
        }
       # return $retObj
       $retObj

    } | Wait-RSJob

    $out.Add( $( Get-RSJob | Receive-RSJob) )
    # $out += $( Get-RSJob | Receive-RSJob )

}).TotalSeconds

和

标准foreach

(Measure-Command {

    foreach ($obj in $shortDump) {

        $retObj = [pscustomobject]@{
            UserMail =$obj.Mail
            Type = $obj.Type
        }
        # $out+= $retObj
        $out.Add($retObj)
    }
}).TotalSeconds

我的目标是更快地构建对象，因为我有大约300.000个对象要构建。

编辑:这是另一个例子。它太慢了！

快地

$out = New-Object System.Collections.ArrayList
"default"
(Measure-Command {

    for ($x = 0; $x -lt 100000; $x++) 
    {

        $retObj = [pscustomobject]@{
            UserMail = 'test'
            Type =  'test2'
            Test = 'default'
        }
        $out.Add($retObj)
    }

}).TotalSeconds
$out2 = $out

慢得可怕

$out = New-Object System.Collections.ArrayList
$Test = `"RSJobs"`
"RSJobs"

$ScriptBlock = {     

[pscustomobject]@{
    UserMail = 'test'
    Type =  'test2'
    Test = $Using:Test
}
}

(Measure-Command {
    1..100000 | Start-RSJob -Name {$_} -ScriptBlock $ScriptBlock   
    $out.Add( $( Get-RSJob | Receive-RSJob) )

}).TotalSeconds