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4 PAR Data File Notes

As a convenience for end users, we maintain copies of a user's source code as they are passed into the compiler wrapper scripts ppwcc and ppwupcc. During the linking phase, these source code files are concatenated together along with executable and performance data using the basic Unix tar file format, which is defined on this Wikipedia page:

When an application is run, the full path to the executable is determined (by searching PATH if necessary) and the source archive (extension .sar) is copied over to the performance data file, which gets the extension .par (Performance ARchive). The java PARFile class in the PDM package takes care of making sense of the specially-formatted TAR file.