[Users] Chunked checkpoints with unchunked HDF5_3D output?

Erik Schnetter schnetter at cct.lsu.edu
Wed Jan 6 13:51:36 CST 2016

CarpetIOHDF5 has two output modes. You can either set out_vars, giving
the traditional chunked output, or you can set out3D_vars, which uses
a different output mechanism and slightly different file names. The
latter may be unchunked by default. (I hope.)

(There is also out1D_vars and out2D_vars.)


On Wed, Jan 6, 2016 at 2:39 PM, Bernard Kelly <physicsbeany at gmail.com> wrote:
> Hi. Silly question time:
> I'd like to write some grid functions to disk as HDF5 3D files that
> are *unchunked*, but one per output time step. This I'm doing by
> setting the following parameters:
> IOUtil::out_mode                     = "onefile"
> IOUtil::out_timesteps_per_file = 1
> However, an unexpected (to me) side-effect of this is that my
> checkpoint files are now also unchunked, which leads to longer
> recovery (and occasionally failure).
> So ... can I have chunked checkpoint files, but unchunked everything
> else 3D using CarpetIOHDF5?
> Thanks,
> Bernard
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Erik Schnetter <schnetter at cct.lsu.edu>

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