Inter-Block GPU Communication Via Fast Barrier Synchronization

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Executive Summary

While GPGPU stands for General-Purpose computation on Graphics Processing Units, the lack of explicit support for inter-block communication on the GPU arguably hampers its broader adoption as a general-purpose computing device. Inter-block communication on the GPU occurs via global memory and then requires barrier synchronization across the blocks, i.e., inter-block GPU communication via barrier synchronization. Currently, such synchronization is only available via the CPU, which in turn, can incur significant overhead. The authors propose two approaches for inter-block GPU communication via barrier synchronization: GPU lock-based synchronization and GPU lock-free synchronization.

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