Experimental Physics and
Industrial Control System

Noboru Yamamoto <[email protected]> · Thu, 03 May 2007 14:56:43 +0900

Hi,

Zhong Ren wrote:
> Hi Noboru,
> 
> This is really cool now.  I did all the tests I have so far. 
> No crash at all.  Thank you for the new version.
I'm very glad to know it works for you.
I put a tarball on the web server. You can pick it up at:

http://www-acc.kek.jp/EPICS_Gr/products/EPICS-Python/InstallationMemo.html

Thank you very much again for your help.
Regards,

Noboru

> 
> Zhong
> 
> 
> 
> ---- Original message ----
>> Date: Wed, 02 May 2007 16:24:07 +0900
>> From: Noboru Yamamoto <[email protected]>  
>> Subject: Re: wxPython timer and KEK CaPython314 cause core dump  
>> To: [email protected]
>>
>> Hi Zhong,
>>
>> Please find the latest version of my version of Python-CA
> interface module.
>> I'm testing your wxPython program on my MacBook( Intel Core
> Duo + MacOSX
>> 10.4.9, Python 2.5 and wxPython2.8 installed using dmg
> package) and
>> it runs more than one hour now.( I set "milliseconds" to 1).
>>
>> Thank you very much again for your help and cooperation.
>> Regards,
>>
>> Noboru
>>
>>
>> Zhong Ren wrote:
>>> Hi Noboru,
>>>
>>> Thank you for the update.  I found that the new version did
>>> not solve my problem.  I am running on an Intel duo core. 
>>> Anything special I need to do?  Please test the following
>>> code.  All lines are necessary to reproduce the crash.  One
>>> important observation is that the smaller the milliseconds,
>>> the sooner the crash happens.  Try 1 or 0.1; it crashes almost
>>> immediately.  Thank you for your help.
>>>
>>> Zhong
>>>
>>>
>>> # Segmentation fault (core dumped) occurs after
>>> # running a while.
>>>
>>> import wx
>>> import ca
>>>
>>> def onTimer(event): pass
>>>
>>> print ca.__version__
>>> ca.Monitor('S:SRcurrentAI') # Supply a PV here.
>>>
>>> appli = wx.PySimpleApp()
>>> frame = wx.Frame(None)
>>> timer = wx.Timer()
>>> timer.Bind(wx.EVT_TIMER, onTimer)
>>> timer.Start(milliseconds = 10, oneShot = False)
>>> appli.MainLoop()
>>>
>>>
>>> Other info:
>>>  Pyhton 2.5
>>>  wxPython 2.6.3.3
>>>  RedHat Linux x86_64
>>>  GCC 4.1.1
>>>
>>>
>>> ---- Original message ----
>>>> Date: Thu, 26 Apr 2007 14:29:00 +0900
>>>> From: Noboru Yamamoto <[email protected]>  
>>>> Subject: Re: wxPython timer and KEK CaPython314 cause core
> dump  
>>>> To: [email protected]
>>>> Cc: [email protected]
>>>>
>>>> Hi,
>>>>
>>>> I have updated my version of CA-Python interface module.
>>>> Please find a new tar.gz file as an attachment to this e-mail.
>>>> It may have multi core CPU(such as Intel Core Duo on my
> MacBook).
>>>> As far as I tested, it runs stable on a single core
>>> processors, i686 and
>>>> PPC.
>>>>
>>>> Best regards,
>>>>
>>>> Noboru
>>>>
>>>> Zhong Ren wrote:
>>>>> Dear Noboru,
>>>>>
>>>>> Thank you.  I must say the KEK CaPython314 is very easy
> to use.
>>>>> I am not surprised that your little test below won't crash,
>>>>> since it does not contain a wx.Timer.  In order to repeat my
>>>>> crash, a wx.Timer must be constructed, it must be bound to a
>>>>> onTimer function, and it must be started.  Using
>>>>> threading.Timer instead of wx.Timer will not cause the crash.
>>>>>  I cannot tell who is guilty, wx.Timer or CaPython314.  I
> also
>>>>> have the feeling that Python 2.5 may be the problem.
>>>>>
>>>>> Zhong
>>>>>
>>>>>
>>>>> ---- Original message ----
>>>>>> Date: Wed, 06 Dec 2006 10:47:29 +0900
>>>>>> From: Noboru Yamamoto <[email protected]>  
>>>>>> Subject: Re: wxPython timer and KEK CaPython314 cause core
>>> dump  
>>>>>> To: [email protected]
>>>>>> Cc: [email protected]
>>>>>>
>>>>>> Hi,
>>>>>>
>>>>>> I'm not familiar with WxPytho (yet).
>>>>>>
>>>>>> But, the following code works on MacBook running MacOSX
>>>>> 10.4.8 with
>>>>>> Python2.5,
>>>>> wxPython2.7-osx-unicode-2.7.2.0-universal10.4-py2.5.dmg
>>>>>> and KEK version of CaPython314 ( I should have used the
>>>>> different name
>>>>>> to avoid confusion with FNAL version. Sorry).
>>>>>>
>>>>>> ######################################
>>>>>> import wx,ca
>>>>>>
>>>>>> class MyApp(wx.PySimpleApp):
>>>>>>    def OnInit(self):
>>>>>>        frame = wx.Frame(None, -1, "Hello from wxPython")
>>>>>>        frame.Show(True)
>>>>>>        self.frame=frame
>>>>>>        self.ch=ca.channel("fred")
>>>>>>        self.ch.wait_conn()
>>>>>>        self.ch.monitor(self.ca_callback)
>>>>>>        self.ch.flush()
>>>>>>        self.SetTopWindow(frame)
>>>>>>        return True
>>>>>>
>>>>>>    def ca_callback(self,valstat):
>>>>>>        self.ch.update_val(valstat)
>>>>>>        self.frame.Title="%s:%f"%(self.ch.name,self.ch.val)
>>>>>>
>>>>>> if __name__ == "__main__":
>>>>>>    app = MyApp(0)
>>>>>>    app.MainLoop()
>>>>>>
>>>>>> #############################################
>>>>>>
>>>>>> I hope this can give some idea.
>>>>>> Regards,
>>>>>>
>>>>>> Noboru Yamamoto
>>>>>> EPICS group/J-PARC control group
>>>>>> KEK, JAPAN
>>>>>>
>>>>>> Zhong Ren wrote:
>>>>>>> I managed to isolate a core dump in a minimized Python code
>>>>>>> (see below).  I found two components are essential to
> cause a
>>>>>>> core dump: wx.Timer and ca.Monitor (or ca.Get).  Can
> someone
>>>>>>> tell what the problem is?
>>>>>>>
>>>>>>> ###############################################
>>>>>>> import wx
>>>>>>> import ca
>>>>>>>
>>>>>>> def onTimer(event): pass
>>>>>>>
>>>>>>> ca.Monitor('S:SRcurrentAI')
>>>>>>>
>>>>>>> appli = wx.PySimpleApp()
>>>>>>> frame = wx.Frame(None)
>>>>>>> timer = wx.Timer()
>>>>>>> timer.Bind(wx.EVT_TIMER, onTimer)
>>>>>>> timer.Start(milliseconds = 10, oneShot = False)
>>>>>>> appli.MainLoop()
>>>>>>> ###############################################
>>>>>>>
>>>>>>> Other info:
>>>>>>> Pyhton 2.5
>>>>>>> wxPython 2.6.3.3
>>>>>>> RedHat Linux x86_64
>>>>>>> GCC 4.1.1
>>>>>>>
>>>>>>> To test, let the routine run for a while.  A core dump will
>>>>>>> occur in a few minutes.
>>>>>> ________________
>>>> ________________
>>>> CaPython-1.7.tar.gz (40k bytes)
>>>> ________________
>>>> noboru.yamamoto.vcf (1k bytes)
>> ________________
>> CaPython-1.9.tar.gz (41k bytes)
>> ________________
>> noboru.yamamoto.vcf (1k bytes)

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System