Ben Kietzman created ARROW-8012:
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Summary: [C++][CI] Set CTEST_PARALLEL_LEVEL to $concurrency
Key: ARROW-8012
URL: https://issues.apache.org/jira/browse/ARROW-8012
Project: Apache Arrow
Issue Type: Improvement
Components: C++, CI
Affects Versions: 0.16.0
Reporter: Ben Kietzman
Fix For: 1.0.0
Currently the default {{test}} target runs serially while {{unittest}}
arbitrarily uses 4 threads. On many systems that's suboptimal. The environment
variable {{CTEST_PARALLEL_LEVEL}} can be set to run tests in parallel, and we
should probably have a good default for it (like the hardware concurrency)
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