ATMOSPHERE was presented at the CloudCom2018, from 10th till 13th December, Cyprus. CloudCom is the premier conference on Cloud Computing worldwide, attracting researchers, developers, users, students and practitioners from the fields of big data, systems architecture, services research, virtualization, security and privacy, high performance computing, always with an emphasis on how to build cloud computing platforms with real impact. The conference is co-sponsored by the Institute of Electrical and Electronics Engineers (IEEE), is steered by the Cloud Computing Association, and draws on the excellence of its world-class Program Committee and its participants.

ATMOSPHERE project presented a paper on improving Tail Latency of Stateful Cloud Services

The paper, entitled "Improving Tail Latency of Stateful Cloud Services via GC Control and Load Shedding", shows that using GCI eliminates the impact of the garbage collection on the service latency for small (4 nodes) and large (64 nodes) deployments with no throughput loss.

Most of the modern cloud web services execute on top of runtime environments like .NET’s Common Language Runtime or Java Runtime Environment. On the one hand, runtime environments provide several off-the-shelf benefits like code security and cross-platform execution. On the other hand, runtime’s features such as just-in-time compilation and automatic memory management add a non-deterministic overhead to the overall service time, increasing the tail of the latency distribution. In this context, the Garbage Collector (GC) is among the leading causes of high tail latency. To tackle this problem, we developed the Garbage Collector Control Interceptor (GCI) – a request interceptor algorithm, which is agnostic regarding the cloud service language, internals, and its incoming load. GCI is wholly decentralized and improves the tail latency of cloud services by making sure that service instances shed the incoming load while cleaning up the runtime heap. We evaluated GCI’s effectiveness in a stateful service prototype, varying the number of available instances.