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Added in the validation I did for incompressible. Edited the USER_GUIDE 

with a section about the pitfalls of the incompressible flag.
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blair-crossman 2015-05-29 10:46:46 -06:00
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@ -461,8 +461,29 @@ NOTES: * Not all test parameters need be set.
4) IOR version 3 (Jan 2012-present) has changed the output of IOR somewhat,
and the "testNum" option was renamed "refNum".
***************************
* 8. INCOMPRESSIBLE NOTES *
***************************
Please note that incompressibility is a factor of how large a block compression
algorithm uses. The incompressible buffer is filled only once before write times,
so if the compression algorithm takes in blocks larger than the transfer size,
there will be compression. Below are some baselines that I established for
zip, gzip, and bzip.
1) zip: For zipped files, a transfer size of 1k is sufficient.
2) gzip: For gzipped files, a transfer size of 1k is sufficient.
3) bzip2: For bziped files a transfer size of 1k is insufficient (~50% compressed).
To avoid compression a transfer size of greater than the bzip block size is required
(default = 900KB). I suggest a transfer size of greather than 1MB to avoid bzip2 compression.
Be aware of the block size your compression algorithm will look at, and adjust the transfer size
accordingly.
*********************************
* 8. FREQUENTLY ASKED QUESTIONS *
* 9. FREQUENTLY ASKED QUESTIONS *
*********************************
HOW DO I PERFORM MULTIPLE DATA CHECKS ON AN EXISTING FILE?