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If you have any questions, send email to me at or post your questions on the Official Scripting Guys Forum. I invite you to follow me on Twitter and Facebook. #Powershell website monitor script windowsWell, that is all there is to working with performance logs in Windows PowerShell. The command and associated output are shown here. $a.countersamples | ? | sort path | ft instancename, cookedvalue, path – The curly brackets indicate a script block that is supplied to the Where-Object cmdlet: The $_ is used to refer to each performance counter as it streams across the pipeline. The ? is an alias for the Where-Object cmdlet. In this command, the is used to index into the array of performance counter information, and return the first record set of data. Anyway, here is a command that will return all cooked values that are greater than 3000. On my laptop, quite a few counters return from the command because of the various memory counters at work (my laptop has total memory that is greater than 3000 bytes). If I want to find all counters in the first sample (that contains 220 performance points) that have a cooked value that is greater than 3000, I use the command following this paragraph. This is where I will find the information I am interested in examining. The data I want to work with is stored in a property called countersamples. Remember from yesterday, the counter set on my laptop contains more than 220 counter paths, so for each snapshot, I have more than 220 performance points to examine. To explore the data from the performance log, I import the performance log into a variable, index into the variable, and pull out a single snapshot. blg file directly in PerfMon, as shown in the following figure. The Export-Counter cmdlet has a maxsize parameter (to limit the size of a performance log), but it does not work when the Get-Counter cmdlet is run in continuous mode.Īfter I have finished collecting my data, I can open the. This is because I used the continuous switch. If I run this from the Windows PowerShell console, I need to press Ctrl C to halt execution. If I run this command from the Windows PowerShell ISE, I can click the red button to halt execution of the command. Get-Counter -Counter $a -Continuous | Export-Counter -Path c:\fso\myperflog.blg One would never kick off a scheduled task with the continuous switch. #Powershell website monitor script manualBecause of the manual intervention required, this switch is limited to ad hoc performance testing. I can use the continuous switched parameter to cause the Get-Counter cmdlet to stream data continuously. Streaming the data directly to a file will reduce the memory consumption of the command. If I want to use Windows PowerShell to create a performance log, the best way to do this is to use the pipeline and stream the data directly to the file. $a = (Get-Counter -listSet “PhysicalDisk”).paths $a = (Get-Counter -listSet “LogicalDisk”).paths $a = (Get-Counter -listSet “memory”).paths $a = (Get-Counter -ListSet “Processor Information”).paths After I have gathered all the counters, I submit them to the Get-Counter cmdlet to begin the collection of the data. ![]() For example, let’s use the commands from yesterday’s Hey, Scripting Guy! Blog post that select the performance counter paths to collect processor, memory, and disk information. ![]() This library article talks about other command-line tools that you might find useful in working with performance counters.ĬS, when running scripts that might generate a lot of data, it is important to look at potential memory consumption. If you need to work with performance counter logs in an operating system before Windows 7, use the Relog.exe utility. #Powershell website monitor script windows 7If you would like to start a Windows PowerShell users group, shoot me an email at Performance counter cmdlets in Windows PowerShell work on Windows 7 and later. By the way, next weekend (August 6–7, 2011) I have a couple of articles that talk about what is involved in starting a Windows PowerShell users group. One of the things we were talking about was starting a new Windows PowerShell users group in Pittsburgh. at the PowerShell Deep Dive in Las Vegas. Actually, The Scripting Wife and I had a chance to meet Ken M. who are both from Pittsburgh, Pennsylvania. After I finished giving my two talks on Windows PowerShell at SQLSaturday in Wheeling, West Virginia, I had the chance to talk to Ken M. Hey, Scripting Guy! I am wondering if I can use Windows PowerShell to create a performance counter log that I can use in Perfmon? #Powershell website monitor script how toSummary: Learn how to create and parse performance monitor logs by using Windows PowerShell. ![]()
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