Stakeholders

Lei Huang, Mohamad Chaarawi, Ashley Pittman

Introduction

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Applications normally need to be modified by adopting the DFS API to fully take advantage of the performance provided by DAOS. Such requirements need extra effort from software developers for porting and maintaining. For applications that do not support DFS, dfuse is used to support applications using POSIX interface without the need of code changes with degraded I/O performance compared using native DFS API. Interception library libioil.so was introduced to boost read/write bandwidth by bypassing dfuse for read()/write() and their variants. Metadata related functions (e.g., open, stat, unlink, etc.) still suffer from inferior performance restricted by dfuse. A new interception library that intercepts all I/O related functions in glibc (including read/write as well as metadata related functions) is required to deliver good performance using POSIX comparable with using DFS.

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