integer data being compressed with shuffle filter

Nobody has claimed this yet.

The shuffle filter in hdf5 is really for compressing floating point data a bit better. I don't think it helps much with integer data (though we should probably look into that also). It is nonetheless being applied in all cases.

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Ticket number: 1765
Status: New
Project: VisIt
Tracker: Bug
Priority: Normal
Subject: integer data being compressed with shuffle filter
Assigned to: -
Category: -
Target version: -
Author: Mark Miller
Start: 03/05/2014
Due date:
% Done: 0%
Estimated time:
Created: 03/05/2014 10:56 pm
Updated:
Likelihood: 3 - Occasional
Severity: 2 - Minor Irritation
Found in version: 4.8
Impact:
Expected Use:
OS: All
Support Group: Any
Description:
The shuffle filter in hdf5 is really for compressing floating point data a bit better. I don't think it helps much with integer data (though we should probably look into that also). It is nonetheless being applied in all cases.

Comments:

Start by locating the HDF5 shuffle-filter setup in the C compression or dataset-writing code and trace how the data type is identified. Check any existing compression tests, if present. Done means integer data no longer receives the shuffle filter while floating-point data retains the intended behavior, with tests covering both cases.

Written by the indexing model from the issue text.