Optimizing Application Performance with Change Management Improvements - Part 1
May 02, 2017

Mike Cuppett
Author of "DevOps, DBAs, and DbaaS"

Share this

This blog is an excerpt from DevOps, DBAs, and DBaaS by Mike Cuppet.

End-to-End Response Time

Network packet collectors such as Netmon or Wireshark capture network traffic and provide information about when a request was sent until the response was received — from the network perspective as the capture is taken at the computer's network interface. The gap is the presentation layer, the processing that happens between the browser and the network on the computer. For that, using a product such as Fiddler, HttpWatch, or the Inspect function in certain browsers provide the truest timings.

Combining a packet capture and a browser-level timing makes determining slowness on the user's computer relatively easy, although only a very minute percentage of application performance problems happen at the local computer. But just because multiple users have reported slowness, you should not disregard the client infrastructure. Many companies distribute the same image to many computers, which allows for the possibility that a client-side change has caused a problem. Figure 6-3 demonstrates a packet capture, showing packet sequence, time elements, and packet descriptions.


Note: The packet capture can be analyzed further to determine transaction times.

Figure 6-4 shows a proxy capture using HttpWatch . Notice the http calls, execution duration bars, and time data.


The duration bars make it easy to see which calls take the most time. Imagine the example data being from your application with timings ten times as high. Improving application performance with just this information is possible by investigating each long bar http call.

Figure 6-5 was captured using the browser's Inspect tool , which is accessed by right-clicking the web page in a location without links (a blank space).


Note Again: The long statement durations have to be investigated further for potential performance enhancements.

Similar analysis should be done as part of the DevOps pipeline to hunt and kill performance-draining beasts. As code is tested in the pipeline against the development and integration ecosystems, collecting performance data sets enables a deep analysis of each code statement's impact on performance. Obviously, statements found violating predetermined baseline performance values must be tuned prior to production release.

Although I simply collected data using a browser call to www.oracle.com to provide simple examples, code performance analysis may require including code within the application that captures performance information or start and stop times for each execution. By now, you may realize that the types and count of the possible checks are vast; your goal is to determine which checks, done where, bring the best results.

The infrastructure example exists in real life because customers visiting the company web site expect great response times. What happens behind the curtain is the DevOps team's responsibility to deliver. If the application reaches out for credit card authorization or to validate the visitor's membership needed for a discount, that time needs to be analyzed before and after changes are made.

As shown, digging out exact timings provides a much better understanding of the application performance — broken into manageable chunks for analysis and correction.

Read Optimizing Application Performance with Change Management Improvements - Part 2

Mike Cuppett is a Business Resiliency Architect for a Fortune 25 healthcare organization, and the author of "DevOps, DBAs, and DbaaS: Managing Data Platforms to Support Continuous Integration."
Share this

The Latest

June 28, 2017

In 2017, every second counts and even minor issues can have a significant impact on the success or failure of a brand interaction. Our latest research found that two thirds of people have rising expectations for digital performance, showing that businesses can expect consumer pressure to grow. The App Attention Index 2017 revealed just how unforgiving consumers are of badly performing digital services ...

June 27, 2017

In today's everchanging IT industry, network engineers face a slew of challenges when it comes to network management. As networks continue to grow and become more complex, many IT professionals struggle to get a grasp on key workflows in which network engineers still rely on manual processes, including network documentation, troubleshooting, change management and cybersecurity ...

June 26, 2017

Many organizations are struggling to resolve customer-impacting incidents quickly enough to preserve brand loyalty and revenue, according to PagerDuty's recent State of Digital Operations Report ...

June 23, 2017

"Become the Automator, Not the Automated." While it's a simple enough phrase, it speaks directly to how today's organizations and IT teams must innovate to remain competitive. A critical aspect of innovation is acknowledging the digital transformation of businesses. The move to digitalization enables organizations to more effectively unlock the power of information technology (IT) to fuel and accelerate business innovation. It is a competitive weapon and a survival imperative ...

June 22, 2017

Executives in the US and Europe now place broad trust in Artificial Intelligence (AI) and machine learning systems, designed to protect organizations from more dynamic pernicious cyber threats, according to Radware's 2017 Executive Application & Network Security Survey ....