Optimizing the IIS thread pool
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.
How to improve 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.
My first IIS guide: IISRESET, pool recycles, and site warmup
First guide in our expert IIS guide: how to effectively reset and restart IIS services, websites, and application pools.
The difference can be minutes of downtime on your server (or worse).
See the full recommendations on How to correctly reset, restart, and recycle IIS websites.
Getting back to writing about IIS
I am writing down everything I know from working with thousands of IIS websites over the last 10 years.
When CPU profiling goes bad in production
This week’s How-To: recover from a failed CPU profiler that has frozen your process in production. Plus a trick to temporarily suspend/resume any process you don’t want to be running.
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 lets you remove a specific instance of your choosing. Direct link: LeanSentry How-To: Remove unhealthy or slow Azure instances Reasons to … [Read more…]
ASP.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 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…]
Low Pagefile can cause 503 Service Unavailable on Azure web roles
Is your Azure web role throwing 503 Service Unavailable? It could be because of a poor default Pagefile size.
New Hang diagnostics for IIS & ASP.NET apps
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 …
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 answer this question before getting back to business as usual. The short answer is, I’ve … [Read more…]