PowerShell for Windows Admins

Aug 30 2016   12:26PM GMT

Optimising WMI calls–part 3

Richard Siddaway Richard Siddaway Profile: Richard Siddaway


The next change just uses 1 call to get the disk information instead of 2

Measure-Command -Expression {

$srvs = ‘W16TP5TGT01’, ‘W16TP5TGT02′

for ($i=1; $i -le 150; $i++){

foreach ($srv in $srvs) {
$cs = New-CimSession -ComputerName $srv
$bootupMemory = Get-CimInstance -Query “SELECT * FROM Win32_OperatingSystem” -CimSession $cs
$cpuLoad = Get-CimInstance -Query “SELECT * FROM Win32_Processor” -CimSession $cs

$tSessions = Get-CimInstance -Query “SELECT * FROM Win32_TerminalService” -CimSession $cs

$sfilt = “Name=’imaservice’ OR Name=’mfcom’ OR Name=’cpsvc’ OR Name=’msmq'”
$reqserv = Get-CimInstance -ClassName Win32_Service -Filter $sfilt -CimSession $cs

$ima = $reqserv | where Name -eq ‘imaservice’
$mfcom = $reqserv | where Name -eq ‘mfcom’
$ctxPrintMgr = $reqserv | where Name -eq ‘cpsvc’
$msmqstatus = $reqserv | where Name -eq ‘msmq’

$dfilt = “Deviceid=’c:’ OR Deviceid=’D:'”
$drives = Get-CimInstance -ClassName Win32_Logicaldisk -Filter $dfilt -CimSession $cs

$cDrive = $drives | where deviceid -eq ‘c:’
$dDrive = $drives | where deviceid -eq ‘d:’
Remove-CimSession -CimSession $cs

Time now becomes

Days              : 0
Hours             : 0
Minutes           : 6
Seconds           : 36
Milliseconds      : 923
Ticks             : 3969235528
TotalDays         : 0.00459402260185185
TotalHours        : 0.110256542444444
TotalMinutes      : 6.61539254666667
TotalSeconds      : 396.9235528
TotalMilliseconds : 396923.5528

Not such a dramatic change but overall we’re now taking 26.4% less time to run the code.

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