Change the default value of the parallelism configuration variable from
1 to the number of available cores.
MFC after: 1 week
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Buildable 72514 Build 69397: arc lint + arc unit
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It appears some tests, for example tests/sys/mac/ipacl has side effect. The mac_ipacl module affects some tests running vnet jails when security.mac.ipacl.ipv4 is turned on.
Probably extra efforts is needed ( run tests those have side effects at last order and sequentially, or disable them temporally ) before change the default of kyua parallelism parameter.
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There is an option is_exclusive to prevent that as per kyuafile(5). Should be safe to enable parallelism by default.
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I was using the value of 8 and 16 at work to improve time spend, but I had to revert to 1 because:
- it created a large number of flaky|conflicting tests.
- In case of panic, you don’t know quickly which test was the root cause
And the stability of the test result was a lot more important than the time spend.
Now I have split the tests suite in multiples list that are running in parallel into multiples VM (kepping the stability of run only once).
But my tests with parallel kyua was about 4 years ago.