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[test] Addres TestConcurrentMany*.py flakiness on macOS

Description

[test] Addres TestConcurrentMany*.py flakiness on macOS

On "fast" macOS machines, the TestConcurrentMany*.py tests would fail
randomly with different numbers of breakpoints, watchpoints, etc. This
seems to be avoidable by giving the threads a little time to breath
after the passing the synchronization barrier. This is far from a
structural fix but it reduces the flakiness.

Details

Committed
JDevlieghereSep 3 2019, 10:04 AM
Parents
rL370784: [Tests/GVN] Precommit requested test additions from D66977
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