[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

[netCDF #RPZ-106941]: Bug in netcdf (including 4.1.2-beta2)

This archive contains answers to questions sent to Unidata support through mid-2025. Note that the archive is no longer being updated. We provide the archive for reference; many of the answers presented here remain technically correct, even if somewhat outdated. For the most up-to-date information on the use of NSF Unidata software and data services, please consult the Software Documentation first.

  • Subject: [netCDF #RPZ-106941]: Bug in netcdf (including 4.1.2-beta2)
  • Date: Thu, 10 Mar 2011 07:39:39 -0700
Joerg,

> I wrote:
> > In the meantime, understanding and finding a fix for this problem will
> > be a priority, even though it has apparently been a bug in the library
> > for years, at least since the release of netCDF-3.6.2. I also
> > intend to determine when the bug first appeared in a netCDF release,
> > as that may help in fixing the problem.
> 
> Version 3.5.1 from Feb. 17, 2004 appears to be free of the bug, but it's in 
> the
> next release, version 3.6.0, from Dec. 18, 2004.  We were using cvs back then
> rather than svn for version control, but I may be able to access the history 
> of
> checkins and narrow down which checkin first introduced the bug ...

Actually, as a result of more careful testing, that's wrong.  Version 3.5.1 had 
the
bug, and as far as I can tell now, no version of netCDF has ever handled large
block sizes, such as Lustre uses, correctly.  It looks like there's no shortcut
to fixing this, it will require understanding the optimized buffering code ...

--Russ

Russ Rew                                         UCAR Unidata Program
address@hidden                      http://www.unidata.ucar.edu



Ticket Details
===================
Ticket ID: RPZ-106941
Department: Support netCDF
Priority: Critical
Status: Closed