Copyright Notice:

The documents distributed by this server have been provided by the contributing authors as a means to ensure timely dissemination of scholarly and technical work on a noncommercial basis. Copyright and all rights therein are maintained by the authors or by other copyright holders, notwithstanding that they have offered their works here electronically. It is understood that all persons copying this information will adhere to the terms and constraints invoked by each author's copyright. These works may not be reposted without the explicit permission of the copyright holder.

Publications of SPCL

T. Gysi, J. Baer, T. Hoefler:

 dCUDA: Hardware Supported Overlap of Computation and Communication

(Nov. 2016, Accepted at The International Conference for High Performance Computing, Networking, Storage and Analysis (SC'16) )

Publisher Reference

Abstract

Over the last decade, CUDA and the underlying GPU hardware architecture have continuously gained popularity in various high-performance computing application domains such as climate modeling, computational chemistry, or machine learning. Despite this popularity, we lack a single coherent programming model for GPU clusters. We therefore introduce the dCUDA programming model, which implements device-side remote memory access with target notification. To hide instruction pipeline latencies, CUDA programs over-decompose the problem and over-subscribe the device by running many more threads than there are hardware execution units. Whenever a thread stalls, the hardware scheduler immediately proceeds with the execution of another thread ready for execution. This latency hiding technique is key to make best use of the available hardware resources. With dCUDA, we apply latency hiding at cluster scale to automatically overlap computation and communication. Our benchmarks demonstrate perfect overlap for memory bandwidth-bound tasks and good overlap for compute-bound tasks.

Documents

download article:
download slides:


Recorded talk (best effort)

 

BibTeX

@inproceedings{,
  author={T. Gysi and J. Baer and T. Hoefler},
  title={{dCUDA: Hardware Supported Overlap of Computation and Communication}},
  year={2016},
  month={11},
  note={Accepted at The International Conference for High Performance Computing, Networking, Storage and Analysis (SC'16)},
}