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

[netCDF #TET-842292]: Poor NetCDF-4 parallel performance

Hi Brian,

I apologize for the delayed response; I was out of the office last week.  I 
would have also sworn that I had sent a response to this question before, but I 
cannot find a trace of it.  My sincere apologies!

File I/O for netCDF 4 files are handled by the HDF5 library, libhdf5.  Do you 
know which version of hdf5 is being used?  The latest supported version is 
1.8.16; HDF5 1.10.0 was recently released, but we caution against using it, as 
it will currently generate files that are not backwards compatible.  The HDF 
group also provides guidelines for maximizing parallel I/O performance for 
libhdf5, viewable here:

* https://www.hdfgroup.org/HDF5/faq/parallel.html

I hope this is helpful/useful!

-Ward

> Hello Unidata Support,
> 
> I'm just emailing you to ping about this ticket. Have you had a chance to
> investigate the performance issue at all? Thanks in advance.
> 
> Regards,
> Brian
> 
> --
> Brian Vanderwende
> CISL Consulting Services Group (CSG)
> address@hidden - (303) 497-2442
> Mesa Lab, Room 55L
> 
> address@hidden> wrote:
> 
> >
> > Brian Vanderwende,
> >
> > Your Ticket has been received, and a Unidata staff member will review it
> > and reply accordingly. Listed below are details of this new Ticket. Please
> > make sure the Ticket ID remains in the Subject: line on all correspondence
> > related to this Ticket.
> >
> >     Ticket ID: TET-842292
> >     Subject: Poor NetCDF-4 parallel performance
> >     Department: Support netCDF
> >     Priority: Normal
> >     Status: Open
> >
> >
> >
> > The NetCDF libraries are developed at the Unidata Program Center,
> > in Boulder, Colorado, funded primarily by the National Science Foundation.
> >
> > All support requests are handled by the development team. No dedicated
> > support staff are funded at this time. For this reason we cannot guarantee
> > response times, nor that we can resolve every support issue, although we
> > do our best to respond within 72 hours.
> >
> > It is in the nature of support requests that the same question is asked
> > many
> > times. We urge you to search the support archives for material relating to
> > your support request:
> >
> > http://www.unidata.ucar.edu/search.jsp?support&netcdf
> >
> > If you are having trouble building netCDF, please take a look at the
> > "Building NetCDF" page:
> >
> > http://www.unidata.ucar.edu/software/netcdf/docs/building.html
> >
> > or the (unfortunately somewhat out-of-date) NetCDF Build Troubleshooter
> > page:
> >
> > http://www.unidata.ucar.edu/software/netcdf/docs/troubleshoot.html
> >
> > Windows users should see the FAQ list:
> >
> > http://www.unidata.ucar.edu/software/netcdf/docs/faq.html#windows_netcdf4_2
> >
> > Complete documentation (including a tutorial, and sample programs in C,
> > Fortran,
> > Java, and other programming languages) can be found on the netCDF
> > Documentation page:
> >
> > http://www.unidata.ucar.edu/software/netcdf/docs/
> > http://www.unidata.ucar.edu/software/netcdf/examples/programs/
> >
> > If you resolve your issue through one of these methods, please send a
> > reply to
> > this email, letting us know that you no longer need support. This will help
> > us spend more time on netCDF development.
> >
> > Best regards,
> >
> > Unidata User Support
> >
> >
> 
> 

Ticket Details
===================
Ticket ID: TET-842292
Department: Support netCDF
Priority: Critical
Status: Closed