Liferay has released performance whitepapers for both Liferay 5 and Liferay 6. I got a chance today to review Liferay 6 specs and it looks like they have made some significant strides in performance. Before I point you to the white papers or take two diagrams for comparison, keep in mind that performance on any portal is completely dependent on how you are using it. Cached content on a portal is fast. Pulling data from back end systems whose latency is not under your control will probably not be as fast.   You can find the white papers here.
The key findings of the study are:
1. As an infrastructure portal, Liferay Portal can support over 11000 virtual concurrent users on a single server with mean login times
under ½ a second and maximum throughput of 300+ logins per second.
2. In collaboration and social networking scenarios, each physical server supports over 5000 virtual concurrent users at average transaction
times of under 800ms.
3. Liferay Portal’s WCM scales to beyond 150,000 concurrent users on a single Liferay Portal server with average transaction times
under 50ms and 35% CPU utilization.
4. Given sufficient database and efficient load balancing, Liferay Portal can scale linearly as one adds additional servers
to a cluster.
The following charts are throughput based on simple content portlets. (e.g. very light)
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Viral Marketing: Facebook Comments Right Inside Your Website
Comment Box Plugin running on my test page
Facebook recently announced the Comments Box Plugin. This new plugin allows you to add the Facebook Comments feature to any website.  The plugin makes it easy to include a comment thread on your website, allows for comment moderation, and integrates the Facebook login.
But the really cool thing is that when a user enters a comment on your site, that comment is reflected and synced in that user’s wall or news on Facebook. So not only will your existing website viewers see the comment, but all the people connected to the commentator can see it in Facebook.
The first image shows the comment box I added to a test page on my web site. I’ve signed into Facebook through the plugin, so it displays my profile picture and gives me the option to post my comment to Facebook.
After a user makes a comment on my website, the plugin posts a link to your website and the comment to that user’s Facebook wall. The second image shows
Comments displaying in Facebook
the comment posted to my Facebook news page. People viewing that user’s wall on Facebook can ‘like’ it and post their own comments. These ‘like’ votes and comments are then displayed back on your website automatically.
By implementing this simple social tool on your website, you have an instant way to connect your website with the vast number of Facebook users in a very non-threatening way.  Your website link will be exposed to all the friends of your commentators and you can view their comments on your website.
Be careful, though. The comment data is stored on Facebook, not your website. While you can moderate the comments, you may find that negative comments can go viral just like good comments.
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