On Sat, 13 Feb 2021 05:05:48 GMT, Lin Zang <[email protected]> wrote:

> Yes, It is not known at present, but the heapInspect and heapDumper accept an 
> outputStream, and the actual parallel thread number can be got by 
> gang->active_workers() after WithUpdatedActiveWorkers. Then maybe some code 
> can be added there to record the actual number and finally print to 
> outputStream at the end.

So you are proposing having the attach "heapdumpext" and "inspectheap" commands 
always print the number of threads used? I'm not so sure that is a good idea 
since there are probably existing tools and tests that parse the output, and 
changing its format could break them.

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PR: https://git.openjdk.java.net/jdk/pull/2379

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