Reporting and Logging › Compression Analysis Utility TBECMPCA › How the TBECMPCA Utility Calculates Compression Timings

How the TBECMPCA Utility Calculates Compression Timings

The times in the TBECMPCA report measure only the code related to compression and expansion. This represents the additional instructions that are required to compress or expand file data. The time is captured for each block of data as it is compressed and again when it is expanded. A TTIMER with a TASK parameter is issued immediately before the compression code and again immediately afterwards. Differences between the two values are computed and an overhead value is subtracted from that difference. The result is then added to a total for that compression method. The overhead value is the time difference between two TTIMER macros issued back-to-back.