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function Benchmark-Command ([ScriptBlock]$Expression, [int]$Samples = 1, [Switch]$Silent, [Switch]$Long) {
<#
.SYNOPSIS
Runs the given script block and returns the execution duration.
Hat tip to StackOverflow. http://stackoverflow.com/questions/3513650/timing-a-commands-execution-in-powershell
.EXAMPLE
Benchmark-Command { ping -n 1 google.com }
#>
$timings = @()
do {
$sw = New-Object Diagnostics.Stopwatch
if ($Silent)
{
$sw.Start()
$null = & $Expression
$sw.Stop()
Write-Host "." -NoNewLine
}
else {
$sw.Start()
& $Expression
$sw.Stop()
}
$timings += $sw.Elapsed
$Samples--
}
while ($Samples -gt 0)
Write-Host
$stats = $timings | Measure-Object -Average -Minimum -Maximum -Property Ticks
# Print the full timespan if the $Long switch was given.
if ($Long)
{
Write-Host "Avg: $((New-Object System.TimeSpan $stats.Average).ToString())"
Write-Host "Min: $((New-Object System.TimeSpan $stats.Minimum).ToString())"
Write-Host "Max: $((New-Object System.TimeSpan $stats.Maximum).ToString())"
}
else
{
# Otherwise just print the milliseconds which is easier to read.
Write-Host "Avg: $((New-Object System.TimeSpan $stats.Average).TotalMilliseconds)ms"
Write-Host "Min: $((New-Object System.TimeSpan $stats.Minimum).TotalMilliseconds)ms"
Write-Host "Max: $((New-Object System.TimeSpan $stats.Maximum).TotalMilliseconds)ms"
}
}
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