Towards predicting GPGPU performance for concurrent workloads in Multi-GPGPU environment

General-purpose graphics processing units (GPGPUs) have been widely adapted to the industry due to the high parallelism of graphics processing units (GPUs) compared with central processing units (CPUs). Especially, a GPGPU device has been adopted for various scientific workloads which have high parallelism. To handle the ever increasing demand, multiple applications are often run simultaneously in multiple GPGPU devices. However, when multiple applications are running concurrently, the overall performance of GPGPU devices varies significantly due to the different characteristics of GPGPU applications. To improve the efficiency, it is critical to anticipate the performance of applications and find optimal scheduling policy. In this paper, we analyze various types of scientific applications and identify factors that impact the performance during the concurrent execution of the applications in GPGPU devices. Our analysis results show that each application has distinct characteristic. By considering distinct characteristics of applications, a certain combination of applications has better performance compared with the others when executed concurrently in multiple GPGPU devices. Based on the finding of our analysis, we propose a simulator which predicts the performance of GPGPU devices when multiple applications are running concurrently. Our simulator collects performance metrics during the execution of applications and predicts the performance of certain combinations using the performance metrics. The experimental result shows that the best combination of applications can increase the performance by 39.44% and 65.98% compared with the average of combinations and the worst case, respectively when using a single GPGPU device. When utilizing multiple GPGPU devices, our result shows that the performance improve can be 24.78% and 39.32% compared with the average and the worst combinations, respectively.