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Publications of SPCL

P. Schmid, M. Besta, T. Hoefler:

 High-Performance Distributed RMA Locks

(In Proceedings of the 25th Symposium on High-Performance Parallel and Distributed Computing (HPDC'16), Jun. 2016)
Karsten Schwan Best Paper Award at HPDC'16 (1/20)

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We propose a topology-aware distributed Reader-Writer lock that accelerates irregular workloads for supercomputers and data centers. The core idea behind the lock is a modular design that is an interplay of three distributed data structures: a counter of readers/writers in the critical section, a set of queues for ordering writers waiting for the lock, and a tree that binds all the queues and synchronizes writers with readers. Each structure is associated with a parameter for favoring either readers or writers, enabling adjustable performance that can be viewed as a point in a three dimensional parameter space. We also develop a distributed topology-aware MCS lock that is a building block of the above design and improves state-of-the-art MPI implementations. Both schemes use non-blocking Remote Memory Access (RMA) techniques for highest performance and scalability. We evaluate our schemes on a Cray XC30 and illustrate that they outperform state-of-the-art MPI-3 RMA locking protocols by 81% and 73%, respectively. Finally, we use them to accelerate a distributed hashtable that represents irregular workloads such as key-value stores or graph processing.


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  author={P. Schmid and Maciej Besta and Torsten Hoefler},
  title={{High-Performance Distributed RMA Locks}},
  booktitle={Proceedings of the 25th Symposium on High-Performance Parallel and Distributed Computing (HPDC'16)},