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Turn off Statistics (Min/Max) in ADIOS2 backend #831

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Dec 4, 2020
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Turn off Statistics (Min/Max) in ADIOS2 backend #831

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6 changes: 5 additions & 1 deletion docs/source/backends/adios2.rst
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Expand Up @@ -33,11 +33,15 @@ environment variable default description
``OPENPMD_BP_BACKEND`` ``ADIOS2`` Chose preferred ``.bp`` file backend if ``ADIOS1`` and ``ADIOS2`` are available.
===================================== ========== ================================================================================

Please refer to the `ADIOS2 manual, section 5.1 <https://media.readthedocs.org/pdf/adios2/latest/adios2.pdf>`_ for details on I/O tuning.
Please refer to the `ADIOS2 documentation <https://adios2.readthedocs.io/en/latest/engines/engines.html>`_ for details on I/O tuning.

In case the ADIOS2 backend was not compiled but only the deprecated :ref:`ADIOS1 backend <backends-adios1>`, the default of ``OPENPMD_BP_BACKEND`` will fall back to ``ADIOS1``.
Be advised that ADIOS1 only supports ``.bp`` files up to the internal version BP3, while ADIOS2 supports BP3, BP4 and later formats.

Notice that the ADIOS2 backend is alternatively configurable via :ref:`JSON parameters <backendconfig>`.

Due to performance considerations, the ADIOS2 backend configures ADIOS2 not to compute any dataset statistics (Min/Max) by default.
Statistics may be activated by setting the :ref:`JSON parameter <backendconfig>` ``adios2.engine.parameters.StatsLevel = "1"``.

Best Practice at Large Scale
----------------------------
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13 changes: 12 additions & 1 deletion src/IO/ADIOS/ADIOS2IOHandler.cpp
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Expand Up @@ -1330,7 +1330,18 @@ namespace detail
"SubStreams", std::to_string( num_substreams ) );
}
}
#endif
# endif
if( notYetConfigured( "StatsLevel" ) )
{
/*
* Switch those off by default since they are expensive to compute
* and we don't read them anyway.
* No environement variable for this one, can still be switched
* on via JSON though.
* Default is "1".
*/
m_IO.SetParameter( "StatsLevel", "0" );
}
}

adios2::Engine &
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