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Clairvoyant Prefetching for Distributed Machine Learning I/O
Event Type
Paper
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Memory Systems
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TimeThursday, 18 November 20212:30pm - 3pm CST
Location240-241-242
DescriptionI/O is emerging as a major bottleneck for machine learning training, especially in distributed environments. Indeed, at large scale, I/O takes as much as 85% of training time. Addressing this I/O bottleneck necessitates careful optimization, as optimal data ingestion pipelines differ between systems, and require a delicate balance among access to local storage, external filesystems and remote nodes. We introduce NoPFS, a machine learning I/O middleware, which provides a scalable, flexible and easy-to-use solution to the I/O bottleneck. NoPFS uses clairvoyance: Given the seed generating the random access pattern for training with SGD, it can exactly predict when and where a sample will be accessed. We combine this with an analysis of access patterns and a performance model to provide distributed caching policies that adapt to different datasets and storage hierarchies. NoPFS reduces I/O times and improves end-to-end training by up to 5.4x on the ImageNet-1k, ImageNet-22k and CosmoFlow datasets.
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