http://www.google.com/insidesearch/underthehood.html
Welcome to Under The Hood
Dive into search and learn more about what happens behind the scenes of Google Search. Play with our Experiments Lab and get a better look at the technology behind Google.
Search Evaluation and Experiments
Here’s a deeper look inside search with a short video that showcases the work that goes into the improvements which are made to Google almost every day.
Learn more by reading these blog posts on the methodology and process behind our search ranking, evaluation and algorithmic changes, or by watching this video from the Churchil Club event.
Enter the Experiments Lab
Google tests the newest state-of-the-art technology right with you, the user. Every time you search you’re involved in more than one lab.
- Auto complete experiments
We continue to experiment with different speeds for how quickly we update the results while you type in Google Instant. We experimented also before launching word complete. - Search Ranking experiments
We experimented before launching our recent algorithmic improvement to help people find content from higher quality sites. - User Interface Experiments
Before we launch features globally, we turn on major features for a percentage of our users. You might see one right now. - Experiments in 2010
Google is always doing experiments. During 2010 we realize over 6000 specific Search Experiments.
People often talk about “the Google results” but the truth is there is no single “Google” – at any given time there are 50-200 different versions of our core algorithm out in the wild. Millions more when you realize your search results are personalized to you and you alone. To get the most personalized experience, log in to your Google account.
Life of a Query
If you’re using Google Search you might sometimes wonder how it looks like “behind” the white homepage. Google indexes billions and billions of web pages, our index is well over 100 million gigabytes, but how can Google navigate through all this information?
1 Million Computing Hours
We spent 1,000,000 computing hours to prepare the index.
Lightning Fast Previews
Instant Preview loads in 1/10th of a second on average.
Over 1 Billion Searches Daily
There are more than 1 billion searches each day on Google.
Unique Queries
20% of unique queries are new to us every day.
450 Billion Unique Queries
Since 2003 Google has answered 450 Billion new unique queries – searches we have never seen before.
Over 1,500 Miles To Get The Answer
Every query has to travel on average 1,500 miles to get the answer back to the user.
Waiting time
More than 1,000 man-years have gone into developing the Google search algorithm.
Scale
Over the past year, we increased our index size by billions of documents. Our Caffeine index is more than 100 million gigabytes.
1 Million Computing Hours
Lightning Fast Previews
Over 1 Billion Searches Daily
Unique Queries
450 Billion Unique Queries
Over 1,500 Miles To Get The Answer
Waiting time
Scale
Everyone loves speed
Google deals with more than 1 billion queries a day from all around the world returning results on an average of 0.25 seconds.
We know how frustrating it is to wait.
That’s why we want our search results to be instantaneous. Better yet, we want to help you type (or speak) a search instantly, and then pick a search result instantly with fantastic snippets and previews.
Our search engineers want to make search even faster.
In addition to smart coding on the back end we’ve developed distributed computing systems around that globe that ensure you get fast response times.
With technologies like autocomplete and Google Instant, we help you find the search terms and results you’re looking for before you’re even finished typing.
Today we’re continually crawling the web ensuring that you can find the latest news, blogs and status updates minutes or even seconds after they’re posted. With Realtime Search we’re able to serve up breaking topics from a comprehensive set of sources just moments after events occur.
Realtime search. Case Study 2011 Egyptian Revolution
On Jan. 28, 2011, three days after the start of the Egyptian protests, there were 245k tweets containing the word “Egypt”. Google also indexed 10M new blog posts and 22,350 news results citing Egypt in the 48 hours after the protests began.
“Egypt”
245k Tweets
10m New blog posts
22,350 New results
Search for anything, anywhere
At Google, we are seeing mobile search grow at an exponential rate, increasing five-fold worldwide in just the past two years – a rate comparable to the early days of desktop Google Search.
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