Change default SDK worker parallelism to use the number of cpu cores
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core
improvement
java
P3
python
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Description
The default SDK worker parallelism is currently 1 which uses a single SDK worker across. We may want to change the default to 0 which would provide better CPU utilization by starting a harness per core.
Imported from Jira [BEAM-10413](https://issues.apache.org/jira/browse/BEAM-10413). Original Jira may contain additional context.
Reported by: mxm.
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