SQUASH for AS/400 - Compression Rates

Last Updated: May 28, 1996

SQUASH Test Results

We ran a series of benchmark tests with SQUASH using a variety of common source files that are typical of most AS/400 installations. In each test, Level 1 compression shows the results of simple source member compression; the members are compressed and left as separate members within the source file. Level 2 shows the combined results when using member compression combined with the SQUASH on-line archive function; the members are compressed and then transferred into the SQUASH on-line archive to achieve additional compression savings.

Sample File #1 Test

File Description: Large S36EE Program Source File (QS36SRC)
Record Length: 132
Member Count: 1,101
Member Mix: RPG II (large and small), S&D Specs, F&I Specs

Original Size: 24,226,736 bytes

SQUASH Level 1: 12,700,672 - 47.6% improvement

SQUASH Level 2: 4,760,064 - 80.4% improvement

Sample File #2 Test

File Description: Medium Size OS/400 Program Source File (QSRC)
Record Length: 92
Member Count: 56
Member Mix: RPG/400, COBOL/400, CLP, CMD

Original Size: 863,232 bytes

SQUASH Level 1: 713,728 - 17.3% improvement

SQUASH Level 2: 205,312 - 76.2% improvement

Sample File #3 Test

File Description: Small Size OS/400 Program Source File (QCMDSRC)
Record Length: 92 Member Count: 29
Member Mix: All small CMD members

Original Size: 246,784 bytes

SQUASH Level 1: 238,592 - 3.3% improvement

SQUASH Level 2: 16,896 - 93.2% improvement

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