-conc parameter does not allow 64 right now. On a 64 virtual processors solaris (/usr/sbin/psrinfo -pv), I tried to use value 64, which I was not allowed to:
Error: Bad parameters specified: The following configuration question requires a valid answer:
-- "Concurrency"
-- "The JT Harness harness can run tests concurrently. Specify the maximum number of tests that should be run concurrently:"
The system tag for the question is "regtest.concurrency.concurrency".
Your response is currently set to "64".
Please update your configuration and try again.