(CGNS Documentation Home Page)
(Steering Committee Charter)
(Overview and Entry-Level Document)
(A User's Guide to CGNS)
(Standard Interface Data Structures)
(SIDS-to-ADF File Mapping Manual)
(SIDS-to-HDF File Mapping Manual)
(ADF User's Guide)
(CGNS Tools and Utilities)
CGNS Steering Committee
18 September 2003
11:00 AM Eastern Daylight Time
- The meeting was called to order at 11:05 AM, at the start of the
east-coast hurricane Isabel.
There were 14 attendees, listed below.
- The minutes of the 29 May 2003
telecon meeting were reviewed and approved as posted on the web
- Status of previous action items:
- HDF-5 implementation (Power):
- AEDC has implemented the ADFH library (HDF5) for
CGNS files, and tested it successfully with Wind and
ADFViewer. Seems about 20% slower than ADF for large
datasets. Have not done much investigation into why it
- Greg Power asked for advice on licensing/release
issues. For government organizations like AEDC, what
are the difficulties, procedures to follow, etc., in
re-distributing modified open-source (e.g., GNU licensed)
software? No one had an answer to this. Power will try
to obtain permission to release their work to the CGNS
steering committee as soon as possible.
- Others confirmed that the use of CGNS for large databases
can be prohibitively slow. The problem appears to be
related to the number of nodes (quadratic dependence),
not so much to the amount of data stored in each node.
Reading seems to be faster than writing. Timing tests
seem to indicate the bottleneck is in
Wedan will look into this high priority issue.
- Need to establish communication between Power and Poinot
on their experience with the HDF5 software, if possible.
- Still no linking capability. Is this a fundamental
problem with HDF5? Power will check into this.
- Review of 2 proposals
- Discussion tabled because Bob had to sign off telecon
early. Action item carries over.
- Comments added to website on release policy (Wedan):
- Added to
web site ,
but limited to 256 characters
- Alonso offered to house CGNS website at Stanford, if
- Wedan will look into adding a "home page" at SourceForge,
allowing more content.
now mandatory, documentation in place; no CGNSVersion
extension is being proposed (Towne):
- Towne confirmed that the documentation has been updated.
- Latest 2.2 docs to AIAA for update to
Recommended Practice (Towne):
- PDF file, in style used for AIAA Recommended Practice,
was sent to AIAA on Sept. 2, but no response from them
- Issue of removed element list and element range (Wedan):
- These are easy to re-implement (and in fact the software
changes have already been made and tested in the CVS version).
- Wedan will write and post an extension proposal, to make
- Charter issues (Rumsey): Rumsey and Edwards will work together
to update the Charter.
- ISO Status - Chris described the current status, based on info in
an email from Ray Cosner.
- Still no Boeing funds for this work. It even seems doubtful
that they will be able to restore funding in 2004.
- ISO has adopted a new rule, requiring the cancellation of any
initiatives that have not shown any progress (i.e., passing a
gate) in two years. Under the new rule, all four parts of the
CGNS initiative are subject to cancellation on Sep 30, 2003.
- Ray and Peter Wilson put together and submitted to ISO a draft
submittal for Parts 52, 53, and 110 for gate 3. Hopefully these
will be accepted, and keep the effort alive for two more years.
- They also created a draft of Part 237 for gate 2, although
this has some missing pieces.
- Wedan will be posting the
new drafts at the
CGNS web site.
- HDF5 status (Poinot): On a note unrelated to HDF5, Chris reported
that Marc had been working on a MY-SQL DBS server for CGNS files
over the summer.
- Documentation issues and
CGNStalk issues (Towne):
- No documentation issues.
- CGNStalk has received several emails containing viruses within
the last few weeks. Usually, but not always, the attachment
containing the virus is removed by mail filters at NASA Glenn
before being sent to the list. So far, this has been more of a
nuisance than a severe problem, and no changes have been made to
the subscription policy for CGNStalk.
- Software status (Wedan):
- Most of the recent work has been on the configuration scripts
and the include files, to make the software more portable. It
works for Macintosh, also.
- A new release has not been made yet. Users need to do a CVS
update to get the latest updated software.
- Discussion on extensions:
- The deadline for commenting on the
extension proposals currently posted
has passed. However, we need information/review
from Bush on their status before proceeding.
- Need for decision regarding allowing
(assign team to create a proposal? user who identified need:
Harlan McMorris, CentaurSoft). Rumsey will look into this.
- Need for allowing
node? (assign team to create a proposal? User who identified
need: Edwin van der Weide, Stanford). Van der Weide
will write up a formal proposal, and submit it to Bruce for
- It was mentioned that it would be nice to allow
property under a
node, in addition to under the general
node. Van der Weide will write a proposal, and submit to
Bruce for posting.
- Other issues - Reno abstract on CGNS was not accepted. However,
Theresa Benyo reported that Poinot will be an invited member
of a panel discussion at Reno (Integrated Computational and
Visualization Environments, 8am-12noon Wed Jan 7), but there would
be no published paper. Poinot (Rumsey, Bush) will also re-submit
the abstract to the Portland AIAA meeting.
- Meeting was adjourned at 12:00 PM.
- Summary of action items:
- Power will try to obtain permission to release their work to
the CGNS steering committee as soon as possible.
- Wedan will look into the high priority issue of why CGNS is so
slow for large numbers of nodes.
- Power will check into whether linking is a fundamental problem
- Bush to review/report on the 2 pending proposals for
- Wedan will look into adding a "home page" at SourceForge,
allowing more content & description of CVS and release process.
- Wedan will write and post an extension proposal, regarding
issue of removed element list and element range.
- Rumsey and Edwards will work together to update the Charter.
- Wedan will post the new ISO drafts at the CGNS web site.
- Rumsey will look into need for allowing
GridLocation=FaceCenter for GridConnectivity.
- Van der Weide will write up two formal proposals: one
for allowing BCDataSet under Family_t
node, and one for allowing Periodic BC property under a
GridConnectivity1to1 node. Wedan will post these.
- Poinot (Rumsey, Bush) will re-submit the abstract for the
Portland AIAA meeting.
||Pratt & Whitney
||Boeing - Rocketdyne
||Boeing St. Louis
||Edwin Van der Weide||
||ICEM CFD Engineering