Re: [rvm-research] Question about Jikes -- RVMThread Termination

 > Only on last thread, everything is gone (Heap, FDs ... etc).

What I would do is add a shutdown hook that iterates over all the 
running threads and dumps their performance data before the VM is 
dismantled.

cheers


On 04/03/18 15:32, Khaled Z Mahmoud wrote:
> Hi,
>
> You are right the description of the problem.
>
> I meant to mention “terminate” instead of “suspend”.
>
> What I was trying to do is to add performance monintoring for each 
> thread. Like number of cache misses ... etc. I am still new to Jikes. 
> So I though I could start counting at the start of the thread and stop 
> counting on termination.
>
> Only on last thread, everything is gone (Heap, FDs ... etc).
>
>
> On Mar 1, 2018, at 10:57 PM, Robin Garner <[email protected] 
> <mailto:[email protected]>> wrote:
>
>> Hi Khaled,
>>
>> I'm not entirely sure I follow what you're doing, but if I understand 
>> correctly, you've instrumented the suspend() method to execute some 
>> code just before (after) it blocks (?), and this is working just fine 
>> until VM shutdown ?
>>
>> Then when the VM is shutting down, you want to catch the suspension 
>> of the last thread, and do some kind of post-processing ?  And this 
>> is where it's failing ?
>>
>> This isn't an area where I have much experience, but I wouldn't 
>> expect all threads to terminate in a nice clean way.  Have you tried 
>> a standard shutdown hook ?
>> Runtime.getRuntime().addShutdownHook(thread)
>> or alternatively instrumenting VM.shutdown() or  the sysExit syscall.
>>
>>
>> I would imagine that many threads terminate abruptly as part of the 
>> OS cleanup on exit, in which case, you couldn't make any assumptions 
>> about the state of the (Java or Malloc) heap.
>>
>> Hope I'm not too far from the mark :)
>>
>> cheers
>>
>>
>> On Wed, Feb 21, 2018 at 9:09 AM, Khaled Z Mahmoud 
>> <[email protected] <mailto:[email protected]>> wrote:
>>
>>     Hi,
>>
>>     In RVMThread, I inserted code in the suspend method to call a C
>>     function.
>>     However, it seems that,  at the point when "the last RVMThread" 
>>     suspend is called, any allocated heap area is removed at that time.
>>
>>     Any attempt to access Heap Area fro C through pointers results in
>>     an ugly exception.
>>     Any ideas ?
>>
>>
>>
>>     -- 
>>     Regards,
>>     Khaled Mahmoud
>>
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