compression performance is slow for gzip

Nobody has claimed this yet.

A user tried compressing using gzip and Silo took 2x longer to write the files. The files were smaller though. This could be an issue with how Silo was using HDF5 (maybe single chunking causes performance issues here)

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Ticket number: 3291
Status: New
Project: VisIt
Tracker: Bug
Priority: High
Subject: compression performance is slow for gzip
Assigned to: -
Category: -
Target version: -
Author: Mark Miller
Start: 02/19/2019
Due date:
% Done: 0%
Estimated time:
Created: 02/19/2019 01:41 pm
Updated:
Likelihood: 3 - Occasional
Severity: 2 - Minor Irritation
Found in version: 4.8
Impact:
Expected Use:
OS: All
Support Group: Any
Description:
A user tried compressing using gzip and Silo took 2x longer to write the files. The files were smaller though. This could be an issue with how Silo was using HDF5 (maybe single chunking causes performance issues here)

Comments:

No source file, test, or entry point is identified in the issue. Start by reproducing gzip compression in Silo and compare write time and output size, then investigate the suspected HDF5 single-chunking behavior; done means the cause of the slowdown is identified and the performance is covered by a reproducible result.

Written by the indexing model from the issue text.