RFR: 8294137: Review running times of java.math tests

[Brian Burkhalter]

On Wed, 1 Mar 2023 23:36:04 GMT, Brian Burkhalter <bpb at openjdk.org> wrote:

> Break up `BigIntegerTest` and `SymmetricRangeTests` into subsets which are run quasi-randomly as a function of second within the minute at the time the test is running. `LargeValueExceptions` does not appear amenable to this treatment.

The full running time of `BigIntegerTest` was measured using `time` to be `24.983s`. The running times of its subsets were measured to be

| subset | run time (s) |
|--------|--------------|
| 1      | 14.379       |
| 2      | 10.946       |
| 3      | 18.033       |

The full running time of `SymmetricRangeTests` was measured using `time` to be `42.191s`. The running times of its subsets were measured to be

| subset | run time (s) |
|--------|--------------|
| 1      | 16.997       |
| 2      | 16.838       |
| 3      | 16.047       |
| 4      | 19.276       |

Note that in both cases the overhead of each subset is probably about the same as that of the full test.

-------------

PR: https://git.openjdk.org/jdk/pull/12819