As we’re approaching the PLDI deadline, we have reached another (small) milestone: the 650th commit. Now, almost everything are implemented, and we’ve made tremendous effort trying to optimize all aspects of the runtime system. Hopefully we can submit to PLDI and get accepted!
After 10 months of hardwork, the 600th changeset is committed! Also, since last December, we’ve contributed more than 30,000 lines of code. This is a really huge project!
Here’s an introduction to our HotDep’12 paper
While the word ‘cloud-computing’ has become a cliché, the real strength of cloud is not yet undermined.
Elasticity, the ability to scale up or scale down the application on demand, is not understood clearly to date. There are a few exception though, such as MapReduce or bag-of-tasks type of applications. However, These programming paradigms are simple, usually stateless, and therefore easy to perform dynamic provisioning and so on. For more general type of applications, there has been very little research on how to enable elasticity to them.
We propose a programming model which enables elasticity. Moreover, it makes the programmer easy to reason about the execution of the application in elastic environment. In the model, an application runs in a “logical node.” A logical node is composed of multiple “physical nodes.” Regardless of the number of physical nodes involves in a logical node, an event executed in a logical node is logically equivalent.
However, elasticity induces a new fault-tolerance issue. A naive elasticity scheme would increase failure rate by allowing a physical node failure to induce the entire logical node failure.
Interesting, we found the mechanisms of the programming model naturally provides a solution to the fault-tolerance problem. Specifically, our programming model can recover failures at per-physical-node basis, and thereby transparently masks the physical node failures. More details of the programming model and the failure tolerance mechanisms can be found in the paper.
Please find the poster in the following link.
Just finished my talk at HotDep’12 today, and here I would like to share my slides used in the talk to whoever is interested in it.
Congratulations to all of the contributors: Bo, Sunghwan, Rui, Yu-Chen, Chip and Milind. I almost forgot to mention that our 500th commit of Mace-Fullcontext has been pushed up to the repository! I would like to thank all of you who have contributed to this project.
We officially committed the first changeset on last December 21, and it took less than 9 months to reach the 500th. Since that time, we have committed more than 22,000 lines of code into repository.
The mace fullcontext project is a follow-up project of Mace-incontext, a parallel execution event driven system, led by Sunghwan Yoo, and we started the discussion since about last October. So it’s been almost a year ago!
The 400th commit in mace-fullcontext branch was uploaded just before the new semester commences!
We will be working on maturing this project (fixing all the bugs/combine all pieces together/write applications). The next big target is NSDI 2013 which is due on September 19th!
We’ve logged the 350th changeset in mace-fullcontext! This is almost a month since the 300th changeset.
Finally, after almost two months, 300th commit is pushed up to the central server!
In just three weeks, we had 100 more commits. Our system is much feature-rich than before. But it’s still far from mature. Summer’s coming!