Mike Volodarsky's Blog

Azure, IIS, ASP.NET, and LeanSentry

ASP.NET

Fixing W3WP.exe memory leaks is easier than you think

April 5, 2022 by mvolo Leave a Comment

Memory leaks can be causing poor website performance, and blowing out your cloud hosting costs.



You can now easily reduce memory usage and fix memory leaks, check out our Diagnose w3wp.exe memory usage guide for the step by step!

Posted in: .NET, ASP.NET, How-To, IIS, LeanSentry, Performance Tagged: ASP.NET, Azure, Guides, How-To, LeanSentry, Memory, Performance, Troubleshooting

Async await hangs in ASP.NET Core, MVC and WebAPI

March 8, 2022 by mvolo Leave a Comment

Debugging async hangs in ASP.NET core, MVC and WebAPI apps can be extra hard!

To help, we added async task support to LeanSentry hang diagnostics. Check out the Diagnose async hangs in ASP.NET Core, MVC and WebAPI for details!

Posted in: .NET, ASP.NET, How-To, IIS, Performance Tagged: ASP.NET, Async, Guides, Hangs, Performance, Troubleshooting

You may be massively overpaying for your CPUs

February 23, 2022 by mvolo Leave a Comment

You could be throwing away 50-80% of your cloud instance CPU power, due to common .NET CPU overheads.

Learn more about these and how to remove them to save on your cloud costs in our W3wp high CPU guide.

Posted in: .NET, ASP.NET, How-To, IIS, LeanSentry, Performance, Uncategorized Tagged: ASP.NET, Azure, CPU, Guides, LeanSentry, Performance

Why high w3wp CPU usage causes your website to choke

December 7, 2021 by mvolo Leave a Comment

High CPU usage in the IIS worker process can cause poor IIS website performance … even if the processor is not completely overloaded.

This can lead to high CPU hangs, 503 queue full outages, and higher-than-needed cloud costs.

Learn why it happens and how to fix it in our High CPU usage in w3wp.exe guide.

Posted in: .NET, ASP.NET, How-To, IIS Tagged: CPU, Guides, How-To, Performance

ASP.NET Response.Flush could be breaking your site

May 20, 2015 by mvolo 1 Comment

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 API, a silent but deadly performance killer. Many of our ASP.NET customers experience performance degradation and hangs because of it, so its … [Read more…]

Posted in: ASP.NET, IIS Tagged: ASP.NET, How-To, IIS

New Hang diagnostics for IIS & ASP.NET apps

May 6, 2015 by mvolo 2 Comments

LeanSentry’s new Hang diagnostics are out! This was a major rewrite of the diagnostic algorithm, and a complete redesign of the interface. Some of the biggest changes are …

Posted in: ASP.NET, IIS, LeanSentry, Troubleshooting Tagged: ASP.NET, IIS, LeanSentry, Troubleshooting

Re-inventing LeanSentry

April 13, 2015 by mvolo Leave a Comment

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 answer this question before getting back to business as usual. The short answer is, I’ve … [Read more…]

Posted in: ASP.NET, IIS, LeanSentry, Personal, Troubleshooting Tagged: ASP.NET, IIS, LeanSentry

Infographic: Debugger vs. Profiler? Fixing slow ASP.NET page loads

October 16, 2013 by mvolo 2 Comments

We put together a fun infographic to compare using the debugger vs. a profiler for troubleshooting slow page loads in ASP.NET apps. This coincides with our recent release of LeanSentry’s slow operation tracking, which provides an lighter (and more informative) alternative to either. Here it is: What do you use currently? Do you agree with … [Read more…]

Posted in: ASP.NET, CodeProject, Debugging, IIS, Performance Tagged: ASP.NET, IIS, Performance

IIS hang troubleshooting guide

October 8, 2013 by mvolo 1 Comment

Want to learn how to troubleshoot IIS website hangs the way Microsoft developers do it? Check out the new IIS hang troubleshooting guide.

Posted in: ASP.NET, CodeProject, Debugging, IIS, Troubleshooting Tagged: ASP.NET, Hangs, IIS, Troubleshooting

Let's fix production troubleshooting

September 17, 2013 by mvolo Leave a Comment

Production troubleshooting sucks. With LeanSentry, our vision has been to fix how IT and developers deal with production troubleshooting.

Today, this vision is getting even closer to being reality with automatic diagnostics for IIS website hangs, ASP.NET memory leaks, and many others.

Posted in: ASP.NET, CodeProject, IIS, LeanSentry, Troubleshooting Tagged: ASP.NET, IIS, LeanSentry, Troubleshooting
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About me

I am the lead developer for LeanSentry, an expert application monitoring service for .NET web apps.

Before that, I used to work for Microsoft where I helped build the IIS 7.0 and ASP.NET products.

Expert IIS and .NET performance guides

  • How to reset and restart IIS correctly.
  • Get the best IIS application pool availability with warmup.
  • Turn on richer IIS logs for IIS log analysis on steroids.
  • Fix 503 queue full errors and improve RPS by tuning the IIS thread pool.
  • Tune high CPU usage in w3wp.exe.
  • Fix .NET memory leaks and tune w3wp memory usage.
  • Fix IIS and ASP.NET hangs, and async await hangs in ASP.NET core, MVC and WebAPI.

Recent Posts

  • Fixing W3WP.exe memory leaks is easier than you think
  • Async await hangs in ASP.NET Core, MVC and WebAPI
  • You may be massively overpaying for your CPUs
  • New guide to IIS and asp.net hangs
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