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A powershell script for running reverse lookups on many IP addresses at once
I often find myself looking at web logs when researching anomalous traffic on our servers. It’s not uncommon for a poorly written web scraper to come through the system and generate spurious errors,...
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Performance: generate web traffic load using a powershell script
The other day, I found myself wanting a quick and dirty way to throw a controlled amount of load against a server for the purpose of tuning some thread settings. What I wanted was to simulate varying...
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Debugging: Use Fiddler and WebProxy to debug HttpWebRequest / HttpWebResponse...
We recently found ourselves debugging code that was making web requests to another server. If we hit the server manually in a web browser, it worked fine, but when we ran it through the code...
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Performance: Yes, time-taken in IIS includes network time
I’ve written previously about many of the useful types of analysis you can perform using the time-taken field in your web logs. However, I would be remiss for not pointing out some limitations of the...
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Solved: ASP.NET Web Services using POST only work on localhost by default
This information isn’t exactly secret, but it took a bit of googling around to piece the answer together, so I wanted to share it in a more condensed form. We are in the process of migrating some...
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Kick off a Cygwin script from a windows bat file with a different working...
I recently created a script that would pull the Tomcat log files from a group of web servers and then run my 95th percentile awk script to generate a summary of response times for the 100 most popular...
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Performance: Hyper-threading actually does boost server capacity
We recently noticed some odd behavior with one of our servers during a deployment. Several machines were removed from the traffic pool to receive updates, and during this time, the other machines were...
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Performance: An awk script for computing 95th percentile times straight from...
When analyzing performance, looking at 95th percentile response times is one of the most useful metrics. While the average can be a good indicator, it can be heavily skewed by lots of small requests...
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Performance Tuning: Visualize your web log performance data using Excel...
I’ve written previously about how to turn on time-taken values in web logs for IIS, Tomcat, and Apache. Armed with time-taken data, you can identify which are the slow pages in your system and decide...
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Performance Tuning Tip: Turn on time-taken in your web logs (IIS, Apache,...
Everyone knows that the web logs generated by web servers like IIS, Apache, and Tomcat (JBOSS / Catalina) are a well-known goldmine of information. They allow you to track site usage, find content...
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