RFR: 8318730: MonitorVmStartTerminate.java still times out after JDK-8209595

[Kevin Walls]

On Thu, 24 Apr 2025 08:53:42 GMT, Kevin Walls <kevinw at openjdk.org> wrote:

> This issue was hard to reproduce or had stopped happening, but was likely a failure to capture the main arguments from a monitored process, caused by slow startups e.g. -Xcomp.  Recent failures seen in Graal testing are most likely the same issue and increasing ARGS_ATTEMPTS has been seen to resolve it.
> 
> While updating the test, fix the very verbose logging: it doesn't need to log, every second, how many nanos it has waited.
> This has made logs from timeouts hardly usable as they are truncated and may miss critical info.  Also, group the "tunable" constants together.

Update:
Additionally, the log can still get huge and truncated due to many many lines like:
hasMainArgs(21400): sun.jvmstat.monitor.MonitorException: Could not attach to 21400
...so, only log such an Exception if it's NOT saying "Could not attach", as they are expected to be very common.

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PR Comment: https://git.openjdk.org/jdk/pull/24843#issuecomment-2828646290