PowerShell随机文件生成器太慢 [英] PowerShell random file generator too slow

问题描述

尝试使用以下PowerShell脚本在Windows中生成随机文件:

Trying to generate random files in Windows with this PowerShell script:

param([string]$path = "C:\temp", [int]$size = "1024", [long]$number= "1000")
Write-Host "Path: $path"
Write-Host "Size of file: $size"
Write-Host "Number of files: $number"

Write-Host "Started at:"
Get-Date -Format HH:mm:ss

md -Force $path |out-null

$script:StartTime = $(Get-Date)
for($i=0; $i -le $number - 1 ; $i++){
    [Byte[]]$out=@(); 0..($size-1) | %{$out += Get-Random -Minimum 0 -Maximum 255};
    [System.IO.File]::WriteAll("$path\$i.bin",$out)
    if (-Not ($i % 100) -and ($i -ne 0 )) {
        Write-Host "$i were created"
        $elapsedTime = $(Get-Date) - $script:StartTime
        $script:StartTime = $(Get-Date)
        Write-Host "$elapsedTime"
    }
}

当我要将文件大小从1KB增加到1MB时，即使一个文件也要花费很长时间，但是我需要成千上万个文件.有办法解决这个瓶颈吗?

When I want to increase filesize from 1KB to 1MB, it take a long time for even one file, but I need thousands of those. Is there way to solve this bottleneck?

推荐答案

已针对Windows为 dd解决了问题.

Solved with dd for windows.

#default values

param([string]$path = "C:\temp", [int]$size = "1048576", [long]$number= "10000")
Write-Host "Path: $path"
Write-Host "Size of file: $size"
Write-Host "Number of files: $number"

##dd.exe should be in same dir
$path_to_dd = Get-Location 

Write-Host "Started at:"
Get-Date -Format HH:mm:ss

md -Force $path |out-null

$script:StartTime = $(Get-Date)

for($i=0; $i -le $number - 1 ; $i++){
    #genarate files
    (& $path_to_dd\dd.exe if=/dev/random of=$path\$i.bin bs=$size count=1) 2>&1 | Out-Null
    #periodical report to stdout with timestamp every 1k files
    if (-Not ($i % 1000) -and ($i -ne 0 )) {
        Write-Host "$i were created"
        $elapsedTime = $(Get-Date) - $script:StartTime
        $script:StartTime = $(Get-Date)
        Write-Host "$elapsedTime"
    }
}

Write-Host "Finished at:"
Get-Date -Format HH:mm:ss

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