Re: [netcdfgroup] NetCDF4 MPI-IO and compression

• To: Thomas Green <thomas.green@xxxxxxxxxxxxxxxx>
• Subject: Re: [netcdfgroup] NetCDF4 MPI-IO and compression
• From: Ed Hartnett <ed@xxxxxxxxxxxxxxxx>
• Date: Wed, 13 Feb 2008 11:07:06 -0700

Thomas Green <thomas.green@xxxxxxxxxxxxxxxx> writes:

> NetCDF users,
>
> Just a quick question.  Can NetCDF4 use MPI-IO if also using
> compression?  I read on the HDFgroup website that MPI-IO and compression
> are not compatible but I am not sure if this still applies and how it
> affects NetCDF4.
>
> The HDFgroup FAQ related to MPI-IO and compression:
> http://www.hdfgroup.com/hdf5-quest.html#p5comp
>
> Many thanks,
>
> Tom
>

No, sorry, that is not allowed by HDF5.

If you want parallel I/O you must use uncompressed data.

I have asked the HDF5 team whether this might be changed in a future
HDF5 release...

Ed

-- 
Ed Hartnett  -- ed@xxxxxxxxxxxxxxxx

• Follow-Ups:
  • Re: [netcdfgroup] NetCDF4 MPI-IO and compression
    • From: Rob Ross

• References:
  • [netcdfgroup] NetCDF4 MPI-IO and compression
    • From: Thomas Green