June 2012
Intermediate to advanced
226 pages
5h 5m
English
Content preview from Web Performance Daybook Volume 2Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.
Chapter 26. Performance Testing with Selenium and JavaScript
Nowadays many websites employ real user monitoring tools such as New Relic (http://newrelic.com/features/real-user-monitoring) or Gomez (http://www.compuware.com/application-performance-management/real-user-monitoring.html) to measure performance of production applications. Those tools provide a great value by giving real time metrics and allow engineers to identify and address eventual performance bottlenecks.
This works well for live deployed applications, but what about a staged setup? Engineers might want to look at the performance before deploying to production, perhaps while going through a QA process. They may want to find possible performance regressions or make sure a new feature is fast. The staged setup could reside on a corporate network however, restricting the use of RUM tools mentioned earlier.
And what about an application hosted in a firewalled environment? Not all web applications are publicly hosted on the Internet. Some are installed in private data centers for internal use only (think about an intranet type of setup).
How can you watch application performance in these types of scenarios? In this chapter, I’ll explain how we leveraged open source software to build our performance test suite.
Recording Data
The initial step is to record data. For that purpose we use a bit of custom code that records time spent on multiple layers: front end, web tier, backend web services, and database.
Our web tier ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.