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════════════════════════════════════════════
DCF/2 Compression/Decompression Test Utility (CTU)
Release Information Version 1
════════════════════════════════════════════
The DCF/2 CTU, or Compression/Decompression Test
Utility is designed to measure DCF/2 compression and
decompression engines.
The tests the CTU performs are ALWAYS done on entire
physical disk units. This means that you cannot test
network disks or other logical DASD devices which have
no geometry.
When the CTU tests a physical disk unit (PDU), it will
process 'chunks' of information from the PDU independent
of any file information. EVEN IF YOU TEST A DISK WHICH
IS ONLY PARTIALLY IN USE, THE ENTIRE DISK IS TESTED, so be
aware that testing a big disk can take a LONG time if you
test every chunk (using a sampling of 1:1).
Also be aware that the compression results will be
calculated based on the compression of all of the disk's
data including the deleted, formatted and unused, and
system file areas. TO GAIN THE MOST ACCURATE INSIGHT AS
TO COMPRESSION CHARACTERISTICS FOR A GIVEN FILE TYPE OR
MIX OF FILES, YOU SHOULD USE A DISK FILLED WITH THE FILES
YOU WISH TO TEST.
════════════════════════════════════════════
DCF/2 CTU Statistical Sampling
════════════════════════════════════════════
To speed up testing and still accurately measure compression
performance, you can statistically sample you physical disk.
════════════════════════════════════════════
Support and Feedback
════════════════════════════════════════════
This program samples physical disks by opening up the
device in direct access mode. If your physical disk is in
use (for example by OS/2), you may get compression/decompression
verification errors. These are not errors in the CDE and
occur because of locked conditions on the read operation.
Please let us know what you think of this utility and what kind
of results you have collected.
Our fax telephone is (800) 955-4672 or (303) 484-2670, our
CompuServe OS/2 Vendor Forum is in the OS/2 area under vendor
forums, Proportional Software Corporation.
If you have comments regarding this program or its results,
please contact us at:
Proportional Software
1717 Linden Lake Rd.
Fort Collins, CO 80524
Tel. (303) 484-2665
Fax (303) 484-2670
Thank you for your interest in Proportional Software products.