PerformanceTests

Demo.ps1

<#
    Tests for https://hcritter.devdojo.com/powershell-performance-test-file-reading
#>
[CmdletBinding()]
param(
    [Parameter(Mandatory=$false)]
    [Switch]$Measure
)

# Create a file with 50'000 lines
$LargeFile = 'D:\dummy.txt'
if(Test-Path $largeFile){
    Write-Host "$LargeFile already exists" -ForegroundColor Green
}else{
    Write-Host "$LargeFile not exists, try to create it" -ForegroundColor Cyan
    1..50000 | ForEach-Object { Add-Content -Path $LargeFile -Value "This is a very large Testfile $($_)" }
}
"$LargeFile {0:N2}MB" -f ((Get-Item $LargeFile | Select-Object -exp Length)/1mb) | Write-Host

$SearchPattern = '45123'
if($Measure){
    $StartTime = Get-Date
    Write-Host "Read $LargeFile and return the time to saerch for a the pattern $SearchPattern" -ForegroundColor Green
    @(
        # Get-Content
        Measure-Command {
            $File = Get-Content $LargeFile
            foreach ($Line in $File){
                $Line | Select-String -Pattern $SearchPattern
                #break
            }
        } | Select-Object @{N='Method';E={'Get-Content'}}, @{N='Seconds';E={$_.Seconds}}, @{N='Milliseconds';E={$_.Milliseconds}}, @{N='TotalMilliseconds';E={$_.TotalMilliseconds}}
    
        # System.IO.File::ReadAllLines()
        Measure-Command {
            $File = [system.io.file]::ReadAllLines($LargeFile)
            foreach ($Line in $File){
                $Line | Select-String -Pattern $SearchPattern
                #break
            }
        } | Select-Object @{N='Method';E={'System.IO.File::ReadAllLines()'}}, @{N='Seconds';E={$_.Seconds}}, @{N='Milliseconds';E={$_.Milliseconds}}, @{N='TotalMilliseconds';E={$_.TotalMilliseconds}}
    
        # [System.IO.StreamReader]::ReadLine() - Classic Way
        Measure-Command {
            $sread = [System.IO.StreamReader]::new($largefile) 
            while ($sread.ReadLine()) {
                $_ | Select-String -Pattern $SearchPattern
                #break
            }
        } | Select-Object @{N='Method';E={'[System.IO.StreamReader]::ReadLine() - Classic Way'}}, @{N='Seconds';E={$_.Seconds}}, @{N='Milliseconds';E={$_.Milliseconds}}, @{N='TotalMilliseconds';E={$_.TotalMilliseconds}}
    
        # [System.IO.StreamReader]::ReadLine() - Peek
        Measure-Command {
            $sread = [System.IO.StreamReader]::new($largefile) 
            while ($sread.Peek() -gt -1) {
                $sread.ReadLine() | Select-String -Pattern $SearchPattern
                #break
            }
        } | Select-Object @{N='Method';E={'[System.IO.StreamReader]::ReadLine() - Peek'}}, @{N='Seconds';E={$_.Seconds}}, @{N='Milliseconds';E={$_.Milliseconds}}, @{N='TotalMilliseconds';E={$_.TotalMilliseconds}}
    
        # [System.IO.StreamReader]::ReadLine() - End Of Stream
        Measure-Command {
            $sread = [System.IO.StreamReader]::new($largefile) 
            while ($sread.EndOfStream -eq $false) {
                $sread.ReadLine() | Select-String -Pattern $SearchPattern
                #break
            }
        } | Select-Object @{N='Method';E={'[System.IO.StreamReader]::ReadLine() - End Of Stream'}}, @{N='Seconds';E={$_.Seconds}}, @{N='Milliseconds';E={$_.Milliseconds}}, @{N='TotalMilliseconds';E={$_.TotalMilliseconds}}
    
        # Switch
        Measure-Command {
            switch -File ($LargeFile){
                Default {
                    $_ | Select-String -Pattern $SearchPattern
                    #break
                }
            }
        } | Select-Object @{N='Method';E={'Switch'}}, @{N='Seconds';E={$_.Seconds}}, @{N='Milliseconds';E={$_.Milliseconds}}, @{N='TotalMilliseconds';E={$_.TotalMilliseconds}}
    
    ) | Sort-Object TotalMilliseconds
    $TimeSpan  = New-TimeSpan -Start $StartTime -End (Get-Date)
    $Formatted = $TimeSpan | ForEach-Object {
        '{1:0}h {2:0}m {3:0}s {4:000}ms' -f $_.Days, $_.Hours, $_.Minutes, $_.Seconds, $_.Milliseconds
    }
    Write-Host $('Finished in:', $Formatted -Join ' ') -ForegroundColor Green
}else{
    Write-Host "Read the $LargeFile with the Get-Content and return the matching line for $SearchPattern" -ForegroundColor Green
    $StartTime = Get-Date
    $File = Get-Content $LargeFile
    $MatchingLine = foreach ($Line in $File){
        $Line | Select-String -Pattern $SearchPattern
    }
    $TimeSpan  = New-TimeSpan -Start $StartTime -End (Get-Date)
    $Formatted = $TimeSpan | ForEach-Object {
        '{1:0}h {2:0}m {3:0}s {4:000}ms' -f $_.Days, $_.Hours, $_.Minutes, $_.Seconds, $_.Milliseconds
    }
    Write-Host $MatchingLine 
    Write-Host $('Finished in:', $Formatted -Join ' ') -ForegroundColor Green

    Write-Host "Read the $LargeFile with the Switch-Statement and return the matching line for $SearchPattern" -ForegroundColor Green
    $StartTime = Get-Date
    $MatchingLine = switch -File ($LargeFile){
        Default {
            $_ | Select-String -Pattern $SearchPattern
        }
    }
    $TimeSpan  = New-TimeSpan -Start $StartTime -End (Get-Date)
    $Formatted = $TimeSpan | ForEach-Object {
        '{1:0}h {2:0}m {3:0}s {4:000}ms' -f $_.Days, $_.Hours, $_.Minutes, $_.Seconds, $_.Milliseconds
    }
    Write-Host $MatchingLine 
    Write-Host $('Finished in:', $Formatted -Join ' ') -ForegroundColor Green
}