PowerShell は、現在のスクリプトランタイムによって消費されるメモリの動的フェッチを実装しています。

#requires -Version 2
 
$script:last_memory_usage_byte = 0
 
function Get-MemoryUsage
{
$memusagebyte = [System.GC]::GetTotalMemory('forcefullcollection')
$memusageMB = $memusagebyte / 1MB
$diffbytes = $memusagebyte - $script:last_memory_usage_byte
$difftext = ''
$sign = ''
if ( $script:last_memory_usage_byte -ne 0 )
{
if ( $diffbytes -ge 0 )
{
$sign = '+'
}
$difftext = ", $sign$diffbytes"
}
Write-Host -Object ('Memory usage: {0:n1} MB ({1:n0} Bytes{2})' -f $memusageMB,$memusagebyte, $difftext)
 
# save last value in script global variable
$script:last_memory_usage_byte = $memusagebyte
}

PS> Get-MemoryUsage
Memory usage: 6.7 MB (6,990,328 Bytes)
PS> $array = 1..100000
PS> Get-MemoryUsage
Memory usage: 10.2 MB (10,700,064 Bytes, +3709736)
PS> Remove-Variable -Name array
PS> Get-MemoryUsage
Memory usage: 7.4 MB (7,792,424 Bytes, -2907640)