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velox/docs/develop/TpchBenchmark.rst

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Multiple Process Executor Use Case
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This use case is used by Spark + `Gluten <https://github.com/oap-project/gluten>`_
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This use case is used by Spark + `Gluten <https://github.com/apache/gluten>`_
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and it differs from the Presto use case where parallelism is concerned. Spark
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uses multiple processes where each process is a Gluten+Velox query processor.
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uses multiple processes where each process is a Gluten + Velox query processor.
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Spark scales by using many Linux processes for query processing. In this case
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this means that the **drivers** are outside of Velox and Gluten and is defined
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by the Spark configuration and number of workers. Gluten takes on the role of

velox/docs/develop/memory.rst

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The *MemoryArbitrator* is defined to support different implementations for
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different query systems. As for now, we implement *SharedArbitrator* for both
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Prestissimo and Prestissimo-on-Spark. `Gluten <https://github.com/apache/incubator-gluten>`_ implements its own memory
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Prestissimo and Prestissimo-on-Spark. `Gluten <https://github.com/apache/gluten>`_ implements its own memory
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arbitrator to integrate with the `Spark memory system <https://www.linkedin.com/pulse/apache-spark-memory-management-deep-dive-deepak-rajak/>`_. *SharedArbitrator*
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ensures the total allocated memory capacity is within the query memory limit
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(*MemoryManager::Options::arbitratorCapacity*), and also ensures each individual

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