On 9/16/25 05:04, Jalil Khan wrote:
From inspecting the source in data_out_base.cc, HDF5 uses chunked
layout, with chunk dimensions set internally in deal.II. At 512³, the
computed chunk size exceeds the HDF5 hard limit of 4 GB per chunk, which
leads to the failure.
Is there a recommended way for users to avoid this error when writing
large output files?
Jalil:
that likely falls in the category of "the person who wrote these HDF5
calls didn't think of this scenario, and nobody has run into it since
then". Can you identify which line in data_out_base.cc specifically
triggers the issue, and can you show how you call deal.II functions to
run into this issue?
In the end, this ought to be fixed of course. Any help is obviously
always welcome!
Best
Wolfgang
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