RFR(L) 8237354: Add option to jcmd to write a gzipped heap dump

[Laurence Cable]

On 2/11/20 11:49 AM, serguei.spitsyn at oracle.com wrote:
> Ralf,
>
> I see this feature adds a lot of code. In fact, I'm not sure, it is 
> worth to add this kind of complexity (including new compressing 
> threads) into the VM implementation. What is a real use case behind 
> it? Could this compressing be done separately from VM implementation?
>
I have to say that the very same thoughts were also occurring to me ...
> Thanks,
> Serguei
>
>
> On 2/11/20 11:41 AM, serguei.spitsyn at oracle.com wrote:
>> Hi Ralf,
>>
>> I'd suggest for the option format something like this:
>>   -gz[=level]
>>
>> where level is an int. The part [=level] is optional.
>> The level is 0 by default (if it is not set).
>>
>> Thanks,
>> Serguei
>>
>> On 2/11/20 7:35 AM, Schmelter, Ralf wrote:
>>> Hi Yasumasa,
>>>
>>> I think I've tried too much by using the -gz flag as a boolean plus 
>>> a int value. I've decided to use two options instead: -gz as a 
>>> boolean option to turn compression on and -gz-level to specify the 
>>> compression level. E.g.
>>> GC.heap_dump -gz -gz-level=3 test.hprof.gz
>>>
>>> Best regards,
>>> Ralf
>>
>