Background picture from http://www.flickr.com/photos/coyote-agile/1578404172/in/photostream/
Describe basic working principles of Dropbox as a free file synchronization service, how it monitors certain files and how they are copied when modifed under its own schedule. It's got a permission system that regulates who's got access to which resources; it's usually done per directory, and you can also make directory results publicly available.
Every node runs independently, although they are started (roughly) at the same time. After an appointed number of generations, an individual (the best) is logged into the common directory, and another one is taken. A file with the total number of evaluations is also created, and the sum of all evaluations is checked as a termination condition. To speed up processing and reduce overhead speeding up synchronization, the individual is codified into the filename, so that the only thing that is read is the directory, not the content of the file itself. We use different kinds of codifications depending on the chromosome length, but lengths of several hundreds are not a problem. As it can be seen, the fitness is also codified into the name.
Picture from Andrew Rivett, Veggiefrog
Using dropbox for distributed evolutionary computation
Assessing Speed-ups In Commodity Cloud Storage Services For Distributed Evolutionary Algorithms Maribel García-Arenas, Juan-J. Merelo Antonio M. Mora, Pedro Castillo, Gustavo Romero, JLJ Laredo GeNeura group University of Granada (Spain) Http://geneura.wordpress.com http://twitter.com/geneura