DBOPT_APPEND_START, CONTINUE, FINISH options for silo objects (HDF5)

cqid: VisIt00007439cqsubmitter: Mark Millercqsubmitdate: 08/09/06 User would like to be able to build up his ucd mesh and variables on disk by appending more nodes and zones in multiple calls. I wouldn't like to try this on the PDB driver (though I think PDB could support it). However, I think we could make it work on the HDF5 driver. If we had DBOPT_APPEND options to specify the beginning, intervening and final calls to write the object(s), we could create extendible datasets in HDF5 and it would work pretty smoothly, I think.

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Ticket number: 318
Status: Pending
Project: VisIt
Tracker: Feature
Priority: Normal
Subject: DBOPT_APPEND_START, CONTINUE, FINISH options for silo objects (HDF5)
Assigned to: -
Category: -
Target version: -
Author: Mark Miller
Start:
Due date:
% Done: 0%
Estimated time:
Created: 08/04/2010 01:26 pm
Updated:
Likelihood:
Severity:
Found in version:
Impact: 3 - Medium
Expected Use: 2 - Rare
OS: All
Support Group: DOE/ASC
Description:
cqid: VisIt00007439cqsubmitter: Mark Millercqsubmitdate: 08/09/06 User would like to be able to build up his ucd mesh and variables on disk by appending more nodes and zones in multiple calls. I wouldn't like to try this on the PDB driver (though I think PDB could support it). However, I think we could make it work on the HDF5 driver. If we had DBOPT_APPEND options to specify the beginning, intervening and final calls to write the object(s), we could create extendible datasets in HDF5 and it would work pretty smoothly, I think.

Comments:

Start by tracing the HDF5 driver’s silo-object writing entry points and existing DBOPT option handling. Define how DBOPT_APPEND_START, DBOPT_APPEND_CONTINUE, and DBOPT_APPEND_FINISH should create and extend datasets across calls, then verify the behavior for UCD mesh nodes, zones, and variables.