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Re-inventing LeanSentry
Hard to believe its been more than a year since my last post! I get a lot of “Hey Mike, what have you been up to?” email from this blog and the IIS troubleshooting newsletter, so I figured I should...
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New Hang diagnostics for IIS & ASP.NET apps
Hang diagnostics 2.0 are out for ASP.NET apps! This was a major rewrite of the diagnostic algorithm, and a complete redesign of the interface. Some of the biggest changes: 1. Visualize IIS/ASP.NET...
View ArticleASP.NET Response.Flush could be breaking your site
We just announced our new expert How-To series, where we’ll be bringing you some of the best practices and techniques we’ve been using with customers. The post this week is about the Response.Flush...
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How-To: Remove slow Azure instances
In case you missed it, LeanSentry How-To last week was about removing slow or unhealthy Azure instances from your cloud service. It’s a relatively new technique made possible by a new Azure API, that...
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When CPU profiling goes bad in production
This week’s Leansentry How-To article covers a tricky topic: how to recover from a failed CPU profiler that has frozen your process in production. Recovering from a CPU profiling failure This is...
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The master guide to proactive IIS monitoring
IIS monitoring tools provide a wealth of metrics about your IIS websites, application pools, and requests. But what they don’t provide is a blueprint for how you can use this data to proactively...
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New guide to IIS and asp.net hangs
Website hangs, lockups, requests queueing in ExecuteRequestHandler, slow requests, website not responding. This is the most common, and most frustrating problem that many production IIS websites...
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You may be massively overpaying for your CPUs
Two months ago, we released an expert guide on high CPU in the IIS worker process. This guide went into great detail on how high or even moderate CPU usage in w3wp.exe can spell poor performance for...
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Async await hangs in ASP.NET Core, MVC and WebAPI
Debugging async await hangs is hard! When I first wrote the LeanSentry Hang diagnostics, most .NET web applications were developed using synchronous patterns. Meaning, developers called long-blocking...
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Fixing W3WP.exe memory leaks is easier than you think
Fixing memory leaks is more important (and easier) than you think. I talked about w3wp.exe CPU usage a lot in the last few months, but there is another thing that can have even more impact on your...
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