Generate CPU and Memory load

<#
.EXAMPLE
.\cpu_stress.ps1

This will execute the script against all cores

.DESCRIPTION
#>

# CPUs in the machine
$cpus=$env:NUMBER_OF_PROCESSORS
# Lower the thread so it won't overwhelm the system for other things
[System.Threading.Thread]::CurrentThread.Priority = 'Lowest'

#####################
# perfmon counters for CPU
$Global:psPerfCPU = new-object System.Diagnostics.PerformanceCounter("Processor","% Processor Time","_Total")
$psPerfCPU.NextValue() | Out-Null


$StartDate = Get-Date
Write-Output "=-=-=-=-=-=-=-=-=-=  Stress Machine Started: $StartDate =-=-=-=-=-=-=-=-=-="
Write-Warning "This script will saturate all available CPUs in the machine"
Write-Warning "To cancel execution of all jobs, close the PowerShell Host Window (or terminate the remote session)"
Write-Output "=-=-=-=-=-=-=-=-=-=  CPUs in box: $cpus =-=-=-=-=-=-=-=-=-= "



# This will stress the CPU
foreach ($loopnumber in 1..$cpus){
  Start-Job -ScriptBlock{
  $result = 1
      foreach ($number in 1..0x7FFFFFFF){
          $result = $result * $number
      }# end foreach
  }# end Start-Job
}# end foreach

Write-Output "Created sub-jobs to consume the CPU"
# Ask the user if they want to clear out RAM, if so we will continue
Read-Host -Prompt "Press any key to stop the JOBs CTRL+C to quit"

Write-Output "Clearing CPU Jobs"
Receive-Job *
Stop-Job *
Remove-Job *

$EndDate = Get-Date
Write-Output "=-=-=-=-=-=-=-=-=-= Stress Machine Complete: $EndDate =-=-=-=-=-=-=-=-=-="

<#
.EXAMPLE
.\mem_stress.ps1

This will execute the script to consume all of the memory (less 512 for the OS to survive)

.DESCRIPTION
#>

# RAM in box
$box=get-WMIobject Win32_ComputerSystem
$Global:physMB=$box.TotalPhysicalMemory / 1024 /1024

# Create object to get current memory available
$Global:psPerfMEM = new-object System.Diagnostics.PerformanceCounter("Memory","Available Mbytes")
$psPerfMEM.NextValue() | Out-Null

# leave 512Mb for the OS to survive.
$HEADROOM=512

$ram = $physMB - $psPerfMEM.NextValue()
$maxRAM=$physMB - $HEADROOM

$progress = ($ram / $maxRAM) * 100
$completed  = [int]$progress
$StartDate = Get-Date

Write-Output "=-=-=-=-=-=-=-=-=-=  Memory Stress Started: $StartDate =-=-=-=-=-=-=-=-=-="
Write-Output "mem_stress - This script will consume all but 512MB of RAM available on the machine"
Write-Output "Starting consumed RAM: $ram out of $maxRAM ($completed% Full)"
Write-Output "=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-="
# If you increase the size of the array the GC seems to do quicker cleanups
# Not sure why, but 200MB seems to be the suite spot
$a = "a" * 200MB

# These are the arrays we will create to consume all of the RAM
$growArray = @()
$growArray += $a
$bigArray = @()
$k=0
$lastCompleted = 900

# This loop will continue until we have consumed all of the RAM minus the headroom
while ($ram -lt $maxRAM) {
 $bigArray += ,@($k,$growArray)
 $k += 1
 $growArray += $a
 # Find out how much RAM we are now consuming
 $ram = $physMB - $psPerfMEM.NextValue()
 $progress = ($ram / $maxRAM) * 100
 $completed  = [int]$progress
 $status_string = -join([int]$ram," of ",[int]$maxRAM, "MB ($completed% Complete)")
 # Only show the message when we have a change in percentage
 if ($completed -ne $lastCompleted) {
    Write-Output "$status_string"
    $lastCompleted = $completed
    }
}
Write-Output "=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-="
# Do a final check of RAM after consuming it all
$ram = $physMB - $psPerfMEM.NextValue()
Write-Output "FINAL $ram / $maxRAM"

# Ask the user if they want to clear out RAM, if so we will continue
Read-Host -Prompt "Press any key to clear out RAM or CTRL+C to quit"

Write-Output "Clearing RAM"
#####################
# and now release it all.
$bigArray.clear()
#remove-variable bigArray
$growArray.clear()
#remove-variable growArray
[System.GC]::Collect()
#####################

$ram = $physMB - $psPerfMEM.NextValue()
Write-Output "RAM HAS BEEN CLEARED: $ram / $maxRAM"