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Supercomputing

eBay Makes Huge Gains In Parallel Efficiency 47

Posted by kdawson
from the free-servers-and-a-pony dept.
CurtMonash writes "Parallel Efficiency is a simple metric that divides the actual work your parallel CPUs do by the sum of their total capacity. If you can get your parallel efficiency up, it's like getting free servers, free floor space, and some free power as well. eBay reports that it amazed even itself by increasing overall PE from 50% to 80% in about 6 months — across tens of thousands of servers. The secret sauce was data warehouse-based analytics. I.e., eBay instrumented its own network to do minute-by-minute status checks, then crunched the resulting data to find bottlenecks that needed removing. Obviously, savings are in the many millions of dollars. eBay has been offering some glimpses into its analytic efforts this year, and the PE savings are one of the most concrete examples they're offering to validate all this analytic cleverness."
Yahoo!

Yahoo Changes User Profiles, To Massive Outrage 255

Posted by kdawson
from the why'd-you-go-and-do-that dept.
Wiseleo writes "Yahoo decided to massively screw up their entire userbase by changing all user profiles to blank. No warning, no automated way to get data back, and other unwanted changes. The blog has such choice quotes as 'We know this has been a rough transition for some of you and, and are committed to helping you use, understand, and (hopefully) enjoy your new profile,' and, 'We also know lots of you worked hard on your old profiles and want your data. If you feel like you're missing data, we've saved a copy of your old profile (and alias) and our Customer Care team can retrieve this information. You won't, however, be able to revert back to your old profile format, but you will be able to get any data that you think is missing. To do this, please go here to contact Customer Care.' There were 850 comments posted, all negative, on the first day. There are hundreds more today. There is even more outrage on the Yahoo Messenger blog."

Klein bottle for rent -- inquire within.

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