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The upcoming many-core architectures require software developers to exploitconcurrency to utilize available computational power. Today's high-levellanguage virtual machines (VMs), which are a cornerstone of softwaredevelopment, do not provide sufficient abstraction for concurrency concepts. Weanalyze concrete and abstract concurrency models and identify the challengesthey impose for VMs. To provide sufficient concurrency support in VMs, wepropose to integrate concurrency operations into VM instruction sets.  Since there will always be VMs optimized for special purposes, our goal is todevelop a methodology to design instruction sets with concurrency support.Therefore, we also propose a list of trade-offs that have to be investigated toadvise the design of such instruction sets.  As a first experiment, we implemented one instruction set extension forshared memory and one for non-shared memory concurrency. From our experimentalresults, we derived a list of requirements for a full-grown experimentalenvironment for further research.

Virtual Machine Support for Many-Core Architectures: Decoupling Abstract from Concrete Concurrency Models