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

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]> 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]> 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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