On Thu, 18 Feb 2021 16:38:04 GMT, Chris Plummer <cjplum...@openjdk.org> wrote:

> Or the other option would be to eat the exception and produce an error 
> message saying that the `parallel` option is not supported by the target VM. 
> I don't think the user should be exposed to the "Operation dumpheapext not 
> recognized" message.

Hi Chris,
   I prefer this one as it keep consistent with the old version of jmap -dump 
command when processing "parallel=" option.
   I have updated the PR with the change. 
   Thanks.

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PR: https://git.openjdk.java.net/jdk/pull/2261

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