0000887: Dataformat detection and automatic compression algorithm selection

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0000887

FL5

2.2 Subprogram FLUC (CONV)

public

2017-08-24 15:37

2017-09-28 23:21

Reporter

Falk Reichbott

Assigned To

Mykhailo Moldavskyy

Priority

normal

Severity

feature

Reproducibility

N/A

Status

resolved

Resolution

fixed

Platform

General

OS Version

General

Product Version

5.1.15

Target Version

5.1.16

Fixed in Version

5.1.16

Summary

0000887: Dataformat detection and automatic compression algorithm selection

Description

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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Notes
(0001115) Falk Reichbott (administrator) 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.

(0001125) Falk Reichbott (administrator) 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.

Issue History
Date Modified	Username	Field	Change
2017-08-24 15:37	Falk Reichbott	New Issue
2017-08-24 15:37	Falk Reichbott	Status	new => assigned
2017-08-24 15:37	Falk Reichbott	Assigned To	=> Falk Reichbott
2017-08-30 08:08	Falk Reichbott	Note Added: 0001115
2017-08-30 08:09	Falk Reichbott	Assigned To	Falk Reichbott => Mykhailo Moldavskyy
2017-08-31 16:48	Falk Reichbott	Target Version	5.1.17 => 5.1.16
2017-09-28 23:21	Falk Reichbott	Note Added: 0001125
2017-09-28 23:21	Falk Reichbott	Status	assigned => resolved
2017-09-28 23:21	Falk Reichbott	Fixed in Version	=> 5.1.16
2017-09-28 23:21	Falk Reichbott	Resolution	open => fixed