Sstrutt: Typo fix

2012-11-18T00:00:47Z

Typo fix

← Older revision		Revision as of 00:00, 18 November 2012
Line 1:		Line 1:
	~~Script to~~ run a function at a specific interval throughout the day		This script run's a function at a specific interval throughout the day. The script runs as a continuous task and is a simple scheduling engine.
	<source lang="powershell">		<source lang="powershell">
	$start = Get-Date		$start = Get-Date
Line 23:		Line 23:
	function Log-Perf {		function Log-Perf {
	# Keeps track of script resource usage		# Keeps track of script resource usage
	Log ("Perf CPU(sec): " + [Math]::Round($proc.cpu, 0) + ", Paged Mem (MB): " + [Math]::Round(($proc.pm/1024), 0) + ", WrkSet Mem (MB): " + Math]::Round(($proc.ws/1024), 0))		Log ("Perf CPU(sec): " + [Math]::Round($proc.cpu, 0) + ", Paged Mem (MB): " + [Math]::Round(($proc.pm/1024), 0) + ", WrkSet Mem (MB): " + [Math]::Round(($proc.ws/1024), 0))
	}		}

Sstrutt: Initial creation - content from PowerShell Examples page

2012-04-18T13:30:51Z

Initial creation - content from PowerShell Examples page

New page

Script to run a function at a specific interval throughout the day
<source lang="powershell">
$start = Get-Date

# Scheduler stuff...
$DoSingleRun = 0 # Ignore scheduling and just run once (useful for debugging main function)
$IntervalMins = 15 # Should fit into an hour exactly
$End = "18:50" # Time of day that script should cease (should be just after last required run time)
$CheckThrottle = 250 # Idle throttle / time check interval (msec)

# Scheduled and helper functions ================================================================

function Log ($text) {
$stamp = (Get-Date).ToString("HH:mm:ss.fff")
Write-Host "$stamp | $text"
}

function Do-Stuff {
# This is where the business of the script goes
}

function Log-Perf {
# Keeps track of script resource usage
Log ("Perf CPU(sec): " + [Math]::Round($proc.cpu, 0) + ", Paged Mem (MB): " + [Math]::Round(($proc.pm/1024), 0) + ", WrkSet Mem (MB): " + Math]::Round(($proc.ws/1024), 0))
}

# MAIN SCRIPT ====================================================================================

# Initial prep -----------------------------------------------------------------------------------

if ($DoSingleRun) {
Start-Transcript -Path check-test.log -Append
} else {
Rename-Item -Path check.log -NewName check-1.log -Force
Start-Transcript -Path check.log -Append
}
Log "Started script run at $start"

# Get process for this script
$proc = [System.Diagnostics.Process]::GetCurrentProcess()

# Check scheduler variables
if ((60 % $IntervalMins) -ne 0) {
Log "Interval error - $IntervalMins mins doesn't fit into an hour!"
Exit
}

try {
$EndTime = Get-Date $End
} catch {
Log "Invalid end time: $End hrs"
Log $_.Exception.GetType().FullName
Log $_.Exception.Message
Exit
}

# Set dummy last run time (aligned to nice start time), and next run time
$LastRunTime = Get-Date
$offset = ($IntervalMins + ($LastRunTime.Minute % $IntervalMins))
$LastRunTime = $LastRunTime.AddMinutes(-$offset)
$LastRunTime = $LastRunTime.AddSeconds(-$LastRunTime.Second)
$NextRunTime = $LastRunTime.AddMinutes($IntervalMins)

#Write-Host "Offset is " $offset
Log ("Last runtime is " + $LastRunTime)
Log ("Next runtime is " + $NextRunTime)
Log ("Script cease at " + $EndTime)

# Do any once-off initialisation here,
# eg connect to a MySQL database, open an "I'm alive" TCP port, load credentials

# Main loop -------------------------------------------------------------------------------------

if ($DoSingleRun) {
Log ("Doing single run...")
Do-Stuff
} else {
While (1) {
if ($NextRunTime -lt (Get-Date)) {
Log-Perf
Log ("Starting run at " + (Get-Date))
Do-Stuff
Log ("Completed run at " + (Get-Date))
$LastRunTime = $LastRunTime.AddMinutes($IntervalMins)
$NextRunTime = $LastRunTime.AddMinutes($IntervalMins)
if ($NextRunTime -lt (Get-Date)) {
Log "WARNING: Next run is going to be late!"
}
}
if ($EndTime -lt (Get-Date)) {
Log ("Script ending at " + (Get-Date))
Break
}
Start-Sleep -Milliseconds $CheckThrottle
}
}

# Do any final once-off completion stuff here
# - EG disconnect from database, send "I'm finished" email

Stop-Transcript
</source>

[[Category:PowerShell]]

Scheduling Within a PowerShell Script - Revision history

Sstrutt: Typo fix

Sstrutt: Initial creation - content from PowerShell Examples page