Re: [netcdfgroup] NetCDF4 MPI-IO and compression

• To: Rob Ross <rross@xxxxxxxxxxx>
• Subject: Re: [netcdfgroup] NetCDF4 MPI-IO and compression
• From: Ed Hartnett <ed@xxxxxxxxxxxxxxxx>
• Date: Wed, 13 Feb 2008 13:03:04 -0700

Rob Ross <rross@xxxxxxxxxxx> writes:

> In defense of the HDF team, this is difficult capability to enable in
> practice. This is because prior to compression you don't know how much
> space a given write will require, so parallelizing writes (especially
> if they aren't performed collectively) is not straightforward and
> requires a significant amount of coordination.
>
> Rob
>

Also I was mistaken when I wrote that parallel I/O and the deflate
filter can't be used together. This is only true for writing the data,
not reading it.

So you can read compressed data in parallel.

Thanks,

Ed
-- 
Ed Hartnett  -- ed@xxxxxxxxxxxxxxxx

• Follow-Ups:
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• References:
  • [netcdfgroup] NetCDF4 MPI-IO and compression
    • From: Thomas Green
  • Re: [netcdfgroup] NetCDF4 MPI-IO and compression
    • From: Ed Hartnett
  • Re: [netcdfgroup] NetCDF4 MPI-IO and compression
    • From: Rob Ross