June 2009
Intermediate to advanced
672 pages
19h 8m
English
Content preview from Complete Web Monitoring
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Measuring by Hand: Developer Tools
Your job is to understand end user experience once a system is in production. Long before you deploy the application, your developers will have been using tools to estimate its performance. These include sniffers that can decode network traffic and find granular protocol issues, desktop software that measures responsiveness and suggests corrections, and hosted services that test a page from several locations to analyze its load time across the Internet.
If we’ve done our job explaining the elements of web performance, you’ll be able to understand the results of these tools and pinpoint areas for optimization.
Network Problems: Sniffing the Wire
There’s an old saying in networking: sniffers don’t lie. Seeing the actual TCP/IP conversations that flow across a network connection and reassembling them into the HTTP transactions between a server and a browser is a time-consuming effort. It’s also the best way to find out what really happened.
Wireshark (formerly known as Ethereal), shown in Figure 8-38, is the leading free packet sniffer. You can narrow the traffic it captures to a single TCP/IP session and reassemble the HTTP objects from the data stream. You can also use timing information to measure performance extremely precisely.
Figure 8-38. Wireshark, a popular open source packet analyzer, allows granular analysis of network traffic
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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.
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