Software cache coherence for large scale multiprocessors
HPCA '95 Proceedings of the 1st IEEE Symposium on High-Performance Computer Architecture
Optimistic concurrency for clusters via speculative locking
SYSTOR '09 Proceedings of SYSTOR 2009: The Israeli Experimental Systems Conference
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Munin is a distributed shared memory system that allows parallel programs written for shared memory multiprocessors to be executed efficiently on distributed memory multiprocessors.Unlike existing DSM systems, which provide only a single memory consistency mechanism, Munin provides a suite of consistency protocols. The consistency protocol to be used with a particular shared object is specified by annotating the declaration of the object in the source program. Munin is furthermore the first DSM system to implement release consistency, a relaxed form of memory consistency. Release consistency allows network latency to be masked, and significantly reduces the number of messages required to keep memory consistent. Munin's multi-protocol release consistency is implemented entirely in software. At the heart of the implementation is a delayed update queue, that buffers and merges pending remote writes.A prototype implementaiton on an Ethernet network of 16 SUN-3 processors indicates good performance, without having to make major modifications to the shared memory programs.Further work will include implementation of a second prototype on a high-performance architecture, investigation of hardware support, a port to Mach, and new applciations andd languages to Munin.