Speed up Test-Connection before Foreach - powershell

Question

I made a script to check if users desktop folder are under the cuota limitation, if they're under the cuota limitation the backup to the server will be done correctly.
each user have his computer, so source CSV looks like:
pc1,user1
pc2,user2
pc800,user800
Some computers are Windows Xp and some W7, and the paths can be different 'cause of that I'm using Test-Path
W7 = C:\users\$user\desktop
XP = C:\document and settings\$user\desktop
But Test-Path is SUPER SLOW and I started to use a Test-Connection -count 1 before each Test-path
Anyway, the script still SLOW, in each "bad ping test" I lose lot of time.
CODE:
$csvLocation = '~\desktop\soourceReport.csv'
$csv = import-csv $csvLocation -Header PCName, User
$OuputReport = '~\desktop\newReport.csv'
# info:
# "209715200" Bytes = 200 MB
$cuota = "209715200"
$cuotaTranslate = "$($cuota / 1MB) MB"
Write-Host "Cuota is set to $cuotaTranslate"
$count=1
foreach($item in $csv)
{
write-host "$count# Revisando" $item.User "en" $item.PCName "..." #For debug
if (Test-Connection -Quiet -count 1 -computer $($item.PCname)){
$w7path = "\\$($item.PCname)\c$\users\$($item.User)\desktop"
#echo $w7path #debug
$xpPath = "\\$($item.PCname)\c$\Documents and Settings\$($item.User)\Escritorio"
#echo $xp #debug
if(Test-Path $W7path){
$desktopSize = (Get-ChildItem -Recurse -force $w7path | Measure-Object -ErrorAction "SilentlyContinue" -property length -sum)
write-host -ForegroundColor Green "access succeed"
if($($desktopSize.sum) -gt $cuota){
$newLine = "{0},{1},{2}" -f $($item.PCname),$($item.User),"$("{0:N0}" -f $($desktopSize.sum / 1MB)) MB"
$newLine | add-content $outputReport
Write-Host -ForegroundColor Yellow "cuota exceeded! -- added"
}
else{
Write-Host -ForegroundColor DarkYellow "cuota OK"
}
}
elseif(Test-Path $xpPath){
$desktopSize = (Get-ChildItem -Recurse -force $xpPath | Measure-Object -ErrorAction "SilentlyContinue" -property length -sum)
write-host -ForegroundColor Green "access succeed"
if($($desktopSize.sum) -gt $cuota){
$newLine = "{0},{1},{2}" -f $($item.PCname),$($item.User),"$("{0:N0}" -f $($desktopSize.sum / 1MB)) MB"
$newLine | add-content $outputReport
Write-Host -ForegroundColor Yellow "cuota exceeded! -- added"
}
else{
Write-Host -ForegroundColor DarkYellow "cuota OK"
}
else{
write-host -ForegroundColor Red "Error! - bad path"
}
}
else{
write-host -ForegroundColor Red "Error! - no ping"
}
$count++
}
Write-Host -ForegroundColor green -BackgroundColor DarkGray "All done! new report stored in $report"
To improve it I stored all computers in a $list using another Foreach, before the firstly mentioned SLOW-Foreach loop.
foreach($pcs in $csv){
$alivelist += #( $pcs.PCName )
}
Test-Connection -quiet -count 2 -computer $alivelist
Now, I don't now how to UPDATE or remove the rows ("dead" pc,user) from the SOURCE CSV before to enter into the second Foreach.
I need some of your "magic", or at least some ideas!
thanks

Answer 1

To speed up your script you need to run the checks in parallel (as others have already mentioned). Put your checks and the worker code in a scriptblock:
$sb = {
Param($computer, $username)
if (Test-Connection -Quiet -Count 2 $computer) { return }
$w7path = "\\$computer\c$\users\$username\desktop"
$xpPath = "\\$computer\c$\Documents and Settings\$username.TUITRA..."
if (Test-Path $W7path) {
#...
} elseif (Test-Path $xpPath) {
#...
} else {
#...
}
}
Then run the scriptblock as parallel jobs:
$csv | ForEach-Object {
Start-Job -ScriptBlock $sb -ArgumentList $_.PCName, $_.User
}
# wait for completion
do {
Start-Sleep -Milliseconds 100
} while (Get-Job -State 'Running')
# cleanup
Get-Job | ForEach-Object {
Receive-Job -Id $_.Id
Remove-Job -Id $_.Id
} | Out-File $outputReport
Use a queue if you need to limit the number of parallel jobs.

Answer 2

test-connection is weirdly fast with the -asjob parameter, pinging about 200 computers in 4 seconds:
$list = cat hp.txt
test-connection $list -AsJob ; job | receive-job -wait -AutoRemoveJob