Mike Volodarsky's Blog

Azure, IIS, ASP.NET, and LeanSentry

How-To

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

New guide to IIS and asp.net hangs

February 8, 2022 by mvolo Leave a Comment

To commemorate over 10 years of LeanSentry Hang diagnostics, we wrote an updated guide to resolving IIS and ASP.NET hangs.

Get the step-by-step guide at Diagnose IIS website hangs.

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

The master guide to proactive IIS monitoring

January 11, 2022 by mvolo Leave a Comment

Tired of monitoring dozens of metrics that produce no actionable value, and then still struggling with website outages?

After 10 years of solving IIS performance problems at LeanSentry, we’ve developed a practical model for tuning IIS website performance. Get the full system in our new IIS monitoring guide.

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

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

Lower cloud costs 2x with this IIS application pool recycling strategy

November 18, 2021 by mvolo Leave a Comment
Save cloud costs using a smart memory-based recycling strategy

Reduce your cloud hosting costs 2x or more with a measured memory-based recycling strategy.

Check out our full guide to reduce IIS worker process memory usage with LeanSentry memory diagnostics.

For more tips on how to properly restart IIS websites with minimal production impact, check out our Restart IIS guide.

Posted in: How-To, IIS Tagged: Azure, Cloud, IIS, Recycle application pool

10 precision commands to recycle IIS application pools

November 10, 2021 by mvolo 1 Comment
Many ways to recycle IIS application pools

10 nifty commands I use to find and recycle specific IIS apppools, instead of hammering the server with an IISRESET.

See the right way to recycle application pools at our Restarting IIS expert guide.

Posted in: AppCmd, How-To, IIS Tagged: How-To, IISRESET, Recycle application pool

Optimizing the IIS thread pool

September 14, 2021 by mvolo Leave a Comment
Tune the IIS thread pool for best performance

Tune the IIS thread pool to improve website RPS, and resolve 503 Queue Full errors.

Check out the full guide at https://www.leansentry.com/guide/iis-aspnet-hangs/iis-thread-pool.

Posted in: How-To, IIS, Performance Tagged: IIS, IIS thread pool, Performance

How to improve IIS application pool availability

July 14, 2021 by mvolo Leave a Comment
Maximize IIS application pool availability

Expert guide for configuring your IIS application pool for maximum availability, despite recycling, startup delays, and cold starts.

Get the full guide and ConfigureWarmup tool on Maximum IIS application pool availability.

Posted in: How-To, IIS Tagged: Application pool, Guides, IIS, Recycle application pool, Warmup
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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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