Introducing the Task-Aware Storage I/O (TASIO) Library

TL;DR

The paper presents TASIO, a library that integrates storage I/O into task-based programming models, enabling overlapping of I/O and computation to improve performance.

Contribution

Introduction of TASIO, a novel library that manages storage I/O within task-based models to enhance parallelism and efficiency.

Findings

Achieves up to 2x speedup in certain workloads

Can cause slowdowns if misconfigured

Extensively tested with custom benchmarks

Abstract

Task-based programming models are excellent tools to parallelize and seamlessly load balance an application workload. However, the integration of I/O intensive applications and task-based programming models is lacking. Typically, I/O operations stall the requesting thread until the data is serviced by the backing device. Because the core where the thread was running becomes idle, it should be possible to overlap the data query operation with either computation workloads or even more I/O operations. Nonetheless, overlapping I/O tasks with other tasks entails an extra degree of complexity currently not managed by programming models' runtimes. In this work, we focus on integrating storage I/O into the tasking model by introducing the Task-Aware Storage I/O (TASIO) library. We test TASIO extensively with a custom benchmark for a number of configurations and conclude that it is able to achieve speedups up to 2x depending on the workload, although it might lead to slowdowns if not used with the right settings.