Windows process monitor cpu usage code#
We proactively test and tune the application code before deployment! These teams spend a lot of time in their release cycle running tests and optimizing the code. At the same time, the application likely still experiences high CPU usage and overloads during peak traffic. The knee jerk reaction is to throw more hardware at the problem, which then also ensures that the hosting costs/cloud costs for running your application are 2-5x higher than they really need to be. As a result, these applications tend to run hot, and often experience CPU overloads which can cause downtime and poor performance. These teams assume that the CPU utilization “is what it is”, in other words it’s the computational cost of hosting the website’s workload. We ignore the application’s CPU usage until it becomes a problem. In my experience, teams often fall into one of two camps when it comes to CPU optimization: Proactive performance testing: the tale of two camps If we can do this, we can minimally optimize the right code and prevent this from happening in the future. Instead, all we need to do is determine the application code causing the high CPU usage in the IIS worker process, at the exact time when it causes a hang or website performance degradation in production. Second, it means that extensive rewrites or performance testing of application code is not typically required.
For example, the logging can be modified not to log a specific event, or lock contention can be removed by implementing a low lock pattern. It turns out that this is actually good news!įirst, because the cause of high CPU usage in the application is often of “secondary” nature to the application’s functionality, it can be easily modified or removed without affecting the application’s functionality. Without knowing exactly what code is causing the high w3wp CPU in production at the EXACT TIME of the overload, you are probably optimizing the wrong code! This partially explains why code reviews, and even proactive testing/tuning in a test environment, often fails to find the true cause of production CPU overloads. Query compilation of a particularly complex LINQ query expression.MVC action parameter binding, or serializing large JSON responses.Monitor lock contention on an application lock.Logging library logging a large number of database errors to disk.Instead, the top causes of w3wp exe high CPU usage tend to be application code aspects that you would normally never think about or see during testing, but nonetheless happen when the application experiences peak traffic or an unexpected workload. It’s also not because of IIS being misconfigured (a favorite goto for application developers unable to reproduce the CPU usage in their local dev environments). It’s usually not because of high traffic, denial of service attacks, or “just because our application has to do a lot of work”.
The actual cause of high CPU usage in production is almost always NOT what you think it is! The reason why your IIS worker process has high CPU usageĪfter using LeanSentry to help diagnose and resolve performance issues in 30K+ IIS websites over the last decade, we’ve discovered one simple but valuable fact: We’ll also outline a more effective way to monitor IIS CPU usage, and detect when it causes a problem.įinally, we’ll provide you with a practical approach to diagnosing the underlying causes of CPU usage in your application code, so that you can definitively resolve AND prevent CPU overloads in production.īut first, let’s take a look at why diagnosing high CPU incidents in production tends to be so hard.
Windows process monitor cpu usage full#
In this guide, we are going to explore why this happens, and why W3WP high CPU usage can negatively impact and even take down IIS websites (due to hangs, thread pool exhaustion, queueing/503 queue full errors, and more). High CPU usage in the IIS worker process is the second most common performance complaint for production IIS websites.
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