[Pdns-dev] Re: virtual memory issue and gmysql

[Patrick Domack]

Well, this is good news. I have attempted to figure this out, but  
haven't programmed pthreads myself yet so I was just not sure what I  
was all looking at :)


Quoting Stephen Manchester <smanches at craftyspace.com>:

> Christof was right on with this one.  I had tracked it down to an
> exception causing the thread to exit, but didn't know why the memory
> was still left around.  This explains it exactly.
>
> Distributor.hh needs pthread_detach(pthread_self()); in all locations
> where the ::makeThread() function exits.  I have tested this and
> confirmed it solves the VM memory leak.
>
> Thanks again Christof.  :p
>
> On Oct 3, 2007, at 1:09 PM, Christof Meerwald wrote:
>
>> On Wed, 3 Oct 2007 21:50:16 +0200, Christof Meerwald wrote:
>>> So I strongly suspect that threads are being created but never
>>> joined/detached.
>>
>> I have now also confirmed with a simple test-case that Linux (NPTL) only
>> cleans up the thread stack of terminated threads if they have been detached
>> or joined (one could, of course, argue that this implementation detail could
>> be improved as there is no need to keep the thread stack around for zombie
>> threads).
>>
>>
>> Christof
>>
>> -- 
>>
>> http://cmeerw.org                              sip:cmeerw at cmeerw.org
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