Organizations Get the IT They Deserve
Copyright 2006
80-90% of the end user response time is spent on the front end of the page load experience, so start there. The next rule: avoid script blocking. Most of these require some refactoring of the JavaScript code because you're downloading and then using a technique to eval what got downloaded.
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Read Velocity 08: Even Faster Web Sites (Links)
The Google File System (GFS) is a cluster file system with a familiar interface, but not POSIX compliant. The master also handles machine failures. Tables are broken into tablets. The systems need to be more and more automated. The number of systems is growing faster than Google can hire.
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Read Velocity 08: Storage at Scale (Links)
Read CTO Breakfast on Friday (Links)
Firebug for Firefox, of course, remains free. You can also point a browser on another machine at the proxy running on your PC. You can also use it to monitor outgoing traffic for funny programs phoning home. Firebug is a Firefox extension that is used for measuring and debugging Web sites.
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Read Velocity 08: Some Tools for Improving Web Performance (Links)
By choosing to make their interface compatible with EC2, they take advantage of all the client side tools that work with EC2 to manage machines in Eucalyptus. They want one-button install of their system on top of a cluster of machines. Provide a development platform for the open source community
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Read EUCALYPTUS - Elastic Utility Computing Architecture for Linking Your Programs To Useful Systems (Links)
Minify CSS and Javascript files. You can also combine the CSS and JAvascript files. Loading and parsing HTML, CSS, and JavaScript code is costly. Load assets (even images) on demands. In JavaScript a lookup is done each time a variable is accessed. Avoid using JavaScript for layout.
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Read Velocity 08: High Performance AJAX Applications (Links)
You may want logs on different disk partitions (this stops full file systems from crashing the server). Good timestamps give you the ability to link server activities to external events (like network outages). These are development logging issues, not production. Good logs can help solve problems.
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Read Velocity 08: Actionable Logs (Links)
The operating cost of a data center is about $9/watt over 10 years. This let's you pack the most servers in your data center that you can. A study at Google showed that you have to be able to spread computing over a larger number of machines in order to really take advantage of oversubscription.
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Read Velocity 08: Energy Efficient Operations (Links)
Jiffy provides real data about performance that is more complete and more fine grained than what you might get from Keynote or Gomez. Real data at scale - track 100% of page views You can set a mark and then make any number of measurements of how much time has elapsed from the mark.
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Read Jiffy: Instrumenting and Measuring Web Performance (Links)
In some organizations it can take 6 months to get a new server into the data center. Today we have Cloud 1.0. Soon those tools will be more sophisticated, but still be proprietary. Bill talks about a major corporation with 15,000 virtual machines and they still only get 20% utilization.
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Read Velocity Keynote: IT Operations are Unsustainable (Links)
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