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Strace Output I/O Analyzer.

The strace output I/O analyser is a tool to analyze the I/O behaviour of serial and parallel applications. It traces the system calls and generates statistics for every accessed file.

Getting Started

Prerequisites

The strace output I/O analyzer requires

  • strace to generate traces
  • python 3.4 or greater to analyze the traces

Installation

Just clone the directory from https://github.com/cniethammer/strace-analyzer and use the scripts. No additional steps required.

Usage:

Trace Generation

Generate a trace with the strace wrapper

  ./strace-wrapper.sh ./my_app [APP OPTIONS]

or use the strace-wrapper.sh for MPI parallel programs like

  mpirun [MPI OPTIONS] ./strace-wrapper.sh ./my_app [APP OPTIONS]

which will generate a set of strace log files - one for each MPI process. The log files will be stored in a directory strace-logs under the current path. If the directory does not exist, it will be created. The LOGDIR variable may be used to specify another directory for the log files:

  LOGDIR=my_log_dir mpirun [MPI OPTIONS] ./strace-wrapper.sh ./my_app [APP OPTIONS]

Filtering MPI ranks

For MPI programs running with large number of processes the number of traced processes may have to be narrowed down. The RANK_FILTER variable allows to specify a regex pattern which is matched agains the MPI rank number. Only processes with ranks matching this regex will be traced.

  RANK_FILTER='[0-4]' mpirun [MPI OPTIONS] ./strace-wrapper.sh ./my_app [APP OPTIONS]

Analyzing Traces

To analyze the created traces run

./strace_io_stats.py *.strace

To get help how to use and control strace_io_stats.py run

./strace_io_stats.py --help

Legal Info and Contact

Copyright (c) 2017 HLRS, University of Stuttgart. This software is published under the terms of the BSD license.

Contact: Christoph Niethammer [email protected]

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I/O Analyzer based on the strace tool

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