Logfile Format


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MPE currently provides three different logfile formats: ALOG, CLOG and SLOG. ALOG is provided for backward compatibility purposes only, and stores events as ASCII text. CLOG is similar to ALOG, but stores data in a binary format (essentially ``external32''). SLOG is an abbreviation for Scalable LOGfile format and stores data as states (essentially an event with a duration) in a special binary format chosen to help visualization programs handle very large (multi-Gigabyte) log files.

Each of these log file formats has one or more visualization programs associated with it. The ALOG format is understood by nupshot. The CLOG format is understood by nupshot and jumpshot, a Java-based visualization tool. SLOG and Jumpshot-3 are capable of handling logfiles containing gigabytes of data.



Up: The MPE library of useful extensions Next: Parallel X Graphics Previous: Logfile Creation