Tag Archives: tomcat

A powershell script for running reverse lookups on many IP addresses at once

Posted on May 10, 2012 by jrothmanshore

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, and I start looking at what IP … Continue reading →

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Performance: Yes, time-taken in IIS includes network time

Posted on April 22, 2011 by jrothmanshore

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 data it provides. When poring … Continue reading →

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Kick off a Cygwin script from a windows bat file with a different working directory

Posted on January 26, 2011 by jrothmanshore

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 pages.  I … Continue reading →

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Performance: An awk script for computing 95th percentile times straight from web log files (IIS, Tomcat)

Posted on December 28, 2010 by jrothmanshore

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 or a few extremely long ones.  … Continue reading →

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Performance Tuning: Visualize your web log performance data using Excel scatter plots

Posted on December 7, 2010 by jrothmanshore

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 where to focus your performance … Continue reading →

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Performance Tuning Tip: Turn on time-taken in your web logs (IIS, Apache, Tomcat) to identify performance hot spots

Posted on November 19, 2010 by jrothmanshore

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 errors, gather browser statistics, and all sorts … Continue reading →

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