Change thread dump location?

[David Holmes]

On 15/04/2014 7:36 PM, Staffan Larsen wrote:
> I think this is a valid use-case and it would be good to fix it.
>
> Having said that, there is currently work underway to revise the logging/output from the JVM in JDK 9 (see JEP-158). If that framework was used for the SIGQUIT threaddumps, then it would be possible to configure the output to go to a file instead of tty. Using that would be my preferred solution to this problem.

Agreed.

> However, it is unlikely that this framework will be backported to JDK 8, so perhaps a different solution is needed there.

I'm not convinced this is worthwhile enough to add yet-another-vm-option 
to specify the output file.

David

> /Staffan
>
> On 15 apr 2014, at 09:45, Jaromir Hamala <jaromir.hamala at gmail.com> wrote:
>
>> Hi David,
>>
>> I mean a response to SIGQUIT. I'd like to add an ability to specify a
>> file/directory where threaddumps will be written to even when stdout/err
>> are not redirected. I believe having separated threadumps from rest of the
>> logs might be useful when troubleshooting. It's actually not my idea -
>> there was a user asking how to do it in other mailing-list.
>>
>> Cheers,
>> Jaromir
>>
>>
>> On Tue, Apr 15, 2014 at 7:21 AM, David Holmes <david.holmes at oracle.com>wrote:
>>
>>> Hi Jaromir,
>>>
>>>
>>> On 11/04/2014 11:34 PM, Jaromir Hamala wrote:
>>>
>>>> I'd like to create a patch allowing to change a location of a threaddump
>>>> when it's triggered by sending a signal. My understanding is that
>>>> currently
>>>> there is no option to specify a custom path.
>>>>
>>>
>>> Do you mean the thread-dump in response to SIGQUIT (which goes to the VM's
>>> output stream) or the hs-err log file produced when the VM crashes?
>>>
>>> The SIGQUIT thread-dump doesn't go to a file unless you happen to be
>>> redirecting VM output to a file.
>>>
>>> David
>>>
>>>
>>> Is this a feature you would consider to accept & eventually merge? I'm
>>>> aware one could use eg. jstack to save the threaddump into an arbitrary
>>>> location, but this tooling is not always available as it's part of JDK and
>>>> not JRE.
>>>>
>>>> Cheers,
>>>> Jaromir
>>>>
>>>>
>>
>>
>> --
>> “Perfection is achieved, not when there is nothing more to add, but when
>> there is nothing left to take away.”
>> Antoine de Saint Exupéry
>