Enabling Runtime/Application Co-Design through Common Concurrency Concepts

The best practices for advancing extreme-scale runtimes and the applications they support will likely involve co-design. Applications must change to expose as much concurrency as possible to achieve performance on future architectures, but runtimes must also adapt to address application requirements. We propose a simple classification scheme for demystifying asynchronous many-task (AMT) runtimes and apply the framework to set of runtimes and example applications. We examine possible paths forward for runtime development, and suggest how the basic concepts here can establish best practices for runtime/application co-design.