Urs Holzle from google on “Speed Matters”

From Urs’ talk at the velocity2010 conference [ More info : Google, datacenterknowledge ]

  • Average web page - 320kb, 44 resources, 7 dns lookups, doesn’t compress 3rd of its content
  • Aiming for 100ms page load times for chrome
  • Chrome: HTML5, V8 JS engine, DNS prefetching, VP8 codec, opensource, spurs competition
  • TCP improvements
    • Fast start (higher initial congestion window)
    • Quick loss recovery (lower retransmit timeouts)
    • Makes Google products 12% faster
    • No handshake delay (app payload in SYN packets)  [ Didn’t know this was possible !!! ]
  • DNS improvements
    • Propagate client IP in DNS requests (to allow servers to better map users to the closest servers)
  • SSL improvements
    • False start (reduce 1 round trip from handshake)
      • 10% faster (for Android implementation)
    • Snap start (zero round trip handshakes, resumes)
    • OCSP stapling (avoid inline roundtrips)
  • HTTP improvements (SPDY):
    • Header compression
    • Stream multiplexing and prioritization
    • Server push/hints
    • 25% faster
  • Test done
    • Download the same “top 25” pages via HTTP and SPDY, network simulates a 2Mbps DSL link, 0% packet loss - Number of packets dropped by 40%
    • On low bandwidth links, headers are surprisingly costly. Can add 1 second of latency.
  • Public DNS:
    • reduces recursive resolve time by continuously refreshing cache
    • Increases availability through adequate provisioning
  • Broadband pilot testing going on
    • Fix the “last mile” complaint
    • Huge increase of 100x
  • More developer tools by Google
    • Page speed, speed tracer, closure compiler, Auto spriter
  • More awareness about performance

Comments

Post a Comment

Popular posts from this blog

Chrome Frame - How to add command line parameters

Image
Chrome frame intentionally does stuff without getting in the way of the user. This sometimes makes things harder to debug. For example how can one debug an issue if chrome frame doesn't even launch ? Apparently there is a flag for that. But you have to know how to enable it. Here are the steps. Make sure chrome frame is installed. We can enable startup flags for dumping debug logs using a policy called AdditionalLaunchParameters If this is just for one desktop, I recommend doing a registry edit (it can be pushed via GPO as well) Add a REG_SZ property " AdditionalLaunchParameters " to " SoftwarePoliciesGoogleChromeAdditionalLaunchParameters " with the value "--enable-logging --v=1" (also documented here  and mentioned here )  [ Attachment 1 ] Next kill the IE browser and make sure chrome is also dead by checking taskmgr Restart IE and go to " gcf:about:version " and confirm that the parameters you added show up next to "Command Line:"
Read more

Creating your first chrome app on a Chromebook

Image
Doing development on Chromebook usually means developing online. There are a lot of sites around for that. But with the APIs getting more mature, its just a matter of time before someone builds a kick-ass IDE which runs natively on Chromebooks without network connectivity. One such tool which I've been exploring for a last few weeks is from Google and called " Chrome Dev Editor " If you have never built and run a chrome app or extension, I'll show you how to do this in 3 easy steps.     Step 1 Launch the app and click on the "+" button to add a new project. Pick a project name and select "JavaScript Chrome App" in the drop down menu.       Step 2 Notice how it automatically adds the minimum code required for it to run. This will be the template you are going to work with. You are almost done, but lets review the files in there to understand why they are there.   manifest.json - This is the most important file. Modify the app name, version number
Read more

Brewers CAP Theorem on distributed systems

Image
Large distributed systems run into a problem which smaller systems don’t usually have to worry about. “ Brewers CAP Theorem ” [ Ref 1 ] [ Ref 2 ] [ Ref 3 ]  defines this problem in a very simple way. It states, that though its desirable to have Consistency, High-Availability and Partition-tolerance in every system, unfortunately no system can achieve all three at the same time . C onsistent : A fully Consistent system is one where the system can guarantee that once you store a state (lets say “x=y”) in the system, it will report the same state in every subsequent operation until the state is explicitly changed by something outside the system. [ Example 1 ] A single MySQL database instance is automatically fully consistent since there is only one node keeping the state. [ Example 2 ] If two MySQL servers are involved, and if the system is designed in such a way that all keys starting “a” to “m” is kept on server 1, and keys “n” to “z” are kept on server
Read more