Explore the concept of a Multi-Language Runtime in this 47-minute conference talk from the JVM Language Summit 2015. Delve into IBM's perspective on existing runtimes and JVMs, and uncover their concerns and secret experiments. Learn about method profiling, garbage collection, and Just-in-Time compilers. Discover the story behind this talk, IBM's vision, and the results of their JIT experiments. Gain insights into garbage collection memory visualization and the JDK8 release. This talk, presented by Mark Stoodley, offers a unique look into the technical collaboration among language designers, compiler writers, tool builders, runtime engineers, and VM architects.