FLAM Issue Tracker - FL5
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0000887FL52.2 Subprogram FLUC (CONV)public2017-08-24 15:372017-09-28 23:21
Falk Reichbott 
Mykhailo Moldavskyy 
0000887: Dataformat detection and automatic compression algorithm selection
For CX8/VR8, ADC with or withour ZEDC or GZIP it would be useful to classify the data in:

  High compressable static structured fix length -> CX8
  High compressable static structured variable length -> VR8
  High compressable dynamic structured -> ADC
  Normal compressable dynamic structured -> ZEDC
  Low or not compressable -> COPY (NDC)

This classification must be add to the FLUC dectector and controls the usage of the algorithms if no deticated algo given.

Additional these data classes must be add to the usage log to figure out cost saving.
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Issue History
2017-08-24 15:37Falk ReichbottNew Issue
2017-08-24 15:37Falk ReichbottStatusnew => assigned
2017-08-24 15:37Falk ReichbottAssigned To => Falk Reichbott
2017-08-30 08:08Falk ReichbottNote Added: 0001115
2017-08-30 08:09Falk ReichbottAssigned ToFalk Reichbott => Mykhailo Moldavskyy
2017-08-31 16:48Falk ReichbottTarget Version5.1.17 => 5.1.16
2017-09-28 23:21Falk ReichbottNote Added: 0001125
2017-09-28 23:21Falk ReichbottStatusassigned => resolved
2017-09-28 23:21Falk ReichbottFixed in Version => 5.1.16
2017-09-28 23:21Falk ReichbottResolutionopen => fixed

Falk Reichbott   
2017-08-30 08:08   
CX8/VR8 gives larger compression results the ADC. Means it makes no sense to put this in the algo selection. Based on that, we offer the following solution:

If the environment variable FL_ZEDC_SUPPORT or system variable FLZEDC starts with a digit (0-9) then this number is the allowed expansion of the comprimat if ZEDC expand more then the original software algorithn is used.

This solution is completly transparent in ADC, no change in JCL and the customers now the maximal expansion for the ZEDC.
Falk Reichbott   
2017-09-28 23:21   
The ZEDC support can now activated with threshold. This value is the maximum expansion of the compressed data accepted by FLAM for the ZEDC usage in percent.

See install.txt for z/OS for more information.