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Frequency Techniques for I/O

FTIO captures periodic I/O using frequency techniques. Many high-performance computing (HPC) applications perform their I/O in bursts following a periodic pattern. Predicting such patterns can be very efficient for I/O contention avoidance strategies, including burst buffer management, for example. FTIO allows offline detection and online prediction of periodic I/O phases. FTIO uses the discrete Fourier transform (DFT), combined with outlier detection methods to extract the dominant frequency in the signal. Additional metrics gauge the confidence in the output and tell how far from being periodic the signal is. A complete description