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3.5.3 ncptl-logmerge

coNCePTuaL programs produce one log file per process. An unwieldy number of files can therefore be generated on large-scale computer systems. For the case in which only a single log file contains measurement data, ncptl-logmerge can merge a number of log files into a single file. Only lines that differ across log files are repeated, making the result fairly space-efficient. The primary advantage of ncptl-logmerge over an archiving program such as tar or zip is that the output of ncptl-logmerge is designed to be human-readable—in fact, easily readable.

ncptl-logmerge can also be used to highlight differences in log files. It is therefore an important diagnostic tool for unearthing subtle configuration discrepancies across nodes in a large-scale computer system.

Running ncptl-logmerge  --usage causes ncptl-logmerge to list a synopsis of its core command-line options to the standard output device; running ncptl-logmerge  --help produces basic usage information; and, running ncptl-logmerge  --man outputs a complete manual page. See ncptl-logmerge manual page, shows the ncptl-logmerge documentation as produced by ncptl-logmerge  --man.

Scott Pakin,