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Description
Unless configured otherwise (by means of tests.configure_test_clusters_with_one_processor) tests should be configured to run with a small number of processors (2 was considered a good number by Core/Infra) to adequately size thread pools in relation to the available heap, e.g. using the node.processors setting or -XX:ActiveProcessorCount alternatively.
Sizing thread pools properly is necessary to prevent OOMs when attempting to allocate thread local direct buffers as done in various places.