Implementing a custom performance counter

After some playing around, I’ve finally managed to get my custom performance counter up and running so I thought I’d share the basics.

For IMayBeLate, I want to get an idea of how many emails are being generated. The second version of my site (2.0) isn’t live yet, but I thought it might be a nice metric to see the number of emails, push messages and SMSs being generated when the site does go live. To implement this, I decided to try a custom performance counter as it seems ideally suited.

There are two steps. First, a new category of counters must be created. Secondly, your performance counters are added to that category.

First, create a category and add a counter to it.

   1: if (!PerformanceCounterCategory.Exists("IMayBeLate"))

   2: {

   3:     CounterCreationDataCollection counters = new CounterCreationDataCollection();  


   5:     CounterCreationData totalOps = new CounterCreationData();

   6:     totalOps.CounterName = "# emails sent"; 

   7:     totalOps.CounterHelp = "Total number of emails sent by the EmailProcessor"; 

   8:     totalOps.CounterType = PerformanceCounterType.NumberOfItems64; 

   9:     counters.Add(totalOps);


  11:     PerformanceCounterCategory.Create("IMayBeLate", "Counters related to IMayBeLate", PerformanceCounterCategoryType.SingleInstance, counters);

  12: }

.csharpcode, .csharpcode pre
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.csharpcode .kwrd { color: #0000ff; }
.csharpcode .str { color: #006080; }
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.csharpcode .preproc { color: #cc6633; }
.csharpcode .asp { background-color: #ffff00; }
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This counter is a PerformanceCounterType.NumberOfItems64 type, which is one that just holds an increasing value.

Next, create an instance of the performance counter.

   1: PerformanceCounter totalEmails = null;


   3: totalEmails = new PerformanceCounter("IMayBeLate", "# emails sent", RoleEnvironment.CurrentRoleInstance.Id, false);

   4: totalEmails.MachineName = ".";

   5: totalEmails.ReadOnly = false;

Once you have created the counter, you can increment its value with ease.

   1: totalEmails.Increment();


When you open the Performance Monitor in Windows, you should now be able to select from a new category of counters called IMayBeLate and add it.


I plan on deploying my application to Windows Azure in the future. This article describes how to go about setting up performance Counters in Azure. Hopefully it won’t be too difficult!

EDIT My apologies for the inconsistent code syntax highlighting here – I’m trying out a few different plug-ins for Windows Live Writer.


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