Experimental Physics and
Industrial Control System

"Jeff Hill" <[email protected]> · Thu, 28 Apr 2011 10:46:23 -0600

Hi Carsten,

I created a launchpad bug entry to track the issue (see url below). 

I am starting to suspect that this has something to do with, not sockets,
but instead with the win32 thread handle not being closed, because there are
two of them (two threads) for each client. As I recall, with the win32
thread creation API EPICS is using, _beginthreadex, the handle is implicitly
closed when the thread function returns, but I will need to investigate in
the debugger.

https://bugs.launchpad.net/epics-base/+bug/772471

Jeff
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Jeffrey O. Hill           Email        [email protected]
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Message content: TSPA

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> -----Original Message-----
> From: [email protected] [mailto:[email protected]]
> On Behalf Of Carsten Winkler
> Sent: Thursday, April 28, 2011 12:36 AM
> To: [email protected]
> Subject: Re: Handle leak in Channel Access Server V4.13 (current EPICS
> base) - WinXP
> 
> Hi Jeff,
> 
> I use the native win32-x86 EPICS base port to windows. My caget doesn't
> run at a high repetition
> rate. The problem also occurs when I use camonitor.
> 
> I used camonitor and netstat to check how many tcp circuits are active and
> in what state they are
> in. I called camonitor from a different machine as softIoc.
> At the beginning of my test softIoc had 1282 used handles (constant). When
> I called camonitor I saw
> a new TCP connection to port 5064 (via netstat) and an increase of softIoc
> handles to 1294. Both
> values were constant while running camonitor. After stopping camonitor the
> handle count of softIoc
> decreased to 1284 and the TCP connection to port 5064 was still open.
> After some seconds the TCP
> connection to port 5064 has been closed but the handle count still stands
> by 1284. This two
> additional handles will no more be removed and every new camonitor or
> caget request will add two
> more handles until softIoc crashes.
> 
> To diagnostic the handle count I use the "Performancemonitor"
> (perfmon.exe) from MS Windows and the
> "Processexplorer" (procexp.exe) from Systeminternals.
> 
> I think caget terminates regularly and calls ca_context_destroy to clean
> up all used channel access
> resources.
> 
> I looks to me that Channel Access Server has a serious resource problem!
> 
> Best Regards,
> Carsten Winkler
> 
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Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System