RFR: 8260555: Change the default TIMEOUT_FACTOR from 4 to 1 [v3]

[Leo Korinth]

On Tue, 19 Aug 2025 06:38:01 GMT, SendaoYan <syan at openjdk.org> wrote:

>> No change should be made to any explicit setting of the timeoutFactor in general as that could cause mass timeouts to occur (old default timeout = 120 * 10 = 1200 but new default = 120 * 2.5 = 300!). 
>> 
>> However I see the concern of @sendaoYan because individual tests may now get much larger timeout values when run with the non-default timeoutFactor because they have been adjusted for the new default. I don't see any solution to this dilemma.
>
> But what this PR do is change the timeoutFactor in general and find out all the tests which may timeout after the timeoutFactor has been changed.
> 
> The old default timeout before this PR is 120 * 4, after this PR the new default is 120 * 1

I do not think 4x longer timeouts for `-Xcomp` is unreasonable. I also do not want to make this huge change even bigger. If you would like to change it after the integration I think that would be valuable --- though my guess is that it could be quite a lot of work.

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PR Review Comment: https://git.openjdk.org/jdk/pull/26749#discussion_r2284650722