Hi Sarah, Would you mind opening a bug in SourceForge? So I can fix it at 0.4.2 release which I am preparing...
Thank you, Wander 2009/3/20 Sarah Messer <ikust...@yahoo.com>: > > I seem to have discovered a memory leak in usb.busses(), though I haven't yet > tracked it down in detail. Procedure to expose it: > > open two terminal windows. In one, start up a watch with ps: >> watch -d -n 0.1 'ps -A H -o spid,%cpu,rsz,nlwp,start,eip,stat,cmd | grep >> python' > > The third column is the amount of memory used by each listed application. > (In kB, I believe.) > > In the other, start up Python: (The numbers left of the ">" are my results > for memory used by python before the line executes.) > 0 > python > 4940 >>> import usb > 5040 >>> usb.busses() > 5168 >>> usb.busses() > 5216 >>> usb.busses() > 5220 >>> usb.busses() > 5220 >>> a=usb.busses() > 5228 >>> a=usb.busses() > 5272 >>> a=usb.busses() > 5276 >>> a=usb.busses() > 5276 >>> usb.busses() > 5276 >>> usb.busses() > 5276 >>> b=usb.busses() > 5328 >>> a=usb.busses() > 5328 >>> a=usb.busses() > 5328 >>> usb.busses() > 5328 >>> b=usb.busses() > 5328 >>> > > I dunno - it seems to stabilize after several calls, and seems to depend on > the assignment statement - which may have more to do with Python itself than > pyusb - but I don't get this behavior with simple lists... and forcing a > call to the garbage-collection routine doesn't recover the memory. > > Anyone seen this before? Anyone know if it's a feature of pyusb or python? > > Some Context: > Python 2.6 (r26:66714, Feb 3 2009, 20:49:49) > [GCC 4.3.2 [gcc-4_3-branch revision 141291]] on linux2 > OS: Linux 2.6.27.19-3.2-default x86_64 > openSUSE 11.1 (x86_64) > KDE 4.1.3 "release 4.9" > > It's probably not a big deal, but I'm using Python code to manage a number of > usb devices which occasionally get hot-swapped while I'm trying to talk to > 'em. To make sure I have the comm. set up right I have to call usb.busses() > on a fairly regular basis. I'm leaking memory in several places, with the > result that the code slows substantially over the course of a day. This is > just the first leak I've located. > > Thanks > > > -Sarah > > > --- On Thu, 6/26/08, Abhishek Wadhava <abhishekatma...@gmail.com> wrote: > >> From: Abhishek Wadhava <abhishekatma...@gmail.com> >> Subject: [Pyusb-users] Enquiry about PyUSB >> To: pyusb-users@lists.sourceforge.net >> Date: Thursday, June 26, 2008, 10:01 AM >> Hi.. >> I'm trying to make a Software USB based on AVR309 >> application note available >> at www.atmel.com/dyn/resources/prod_documents/doc2556.pdf >> So what basically i'm doing is programming a ATTINY-44 >> to do functions of a >> USB-driver and when connected to USB port, should be >> automatically detected >> by the computer. >> Now i'm also making a GUI using Tkinter in Python to >> read data from the >> microcontroller & to write in it. >> I was thinking of using pyUSB for this purpose. >> but i'm unable to understand how to read and write from >> a USB device using >> pyUSB. >> Please help me in any way in this regard. >> Thank U. >> >> Abhishek Wadhava >> 3rd year, ECE, >> MANIT, Bhopal(M.P.) >> India >> ------------------------------------------------------------------------- >> Check out the new SourceForge.net Marketplace. >> It's the best place to buy or sell services for >> just about anything Open Source. >> http://sourceforge.net/services/buy/index.php_______________________________________________ >> Pyusb-users mailing list >> Pyusb-users@lists.sourceforge.net >> https://lists.sourceforge.net/lists/listinfo/pyusb-users > > > > > ------------------------------------------------------------------------------ > Apps built with the Adobe(R) Flex(R) framework and Flex Builder(TM) are > powering Web 2.0 with engaging, cross-platform capabilities. Quickly and > easily build your RIAs with Flex Builder, the Eclipse(TM)based development > software that enables intelligent coding and step-through debugging. > Download the free 60 day trial. http://p.sf.net/sfu/www-adobe-com > _______________________________________________ > Pyusb-users mailing list > Pyusb-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/pyusb-users > ------------------------------------------------------------------------------ Apps built with the Adobe(R) Flex(R) framework and Flex Builder(TM) are powering Web 2.0 with engaging, cross-platform capabilities. Quickly and easily build your RIAs with Flex Builder, the Eclipse(TM)based development software that enables intelligent coding and step-through debugging. Download the free 60 day trial. http://p.sf.net/sfu/www-adobe-com _______________________________________________ Pyusb-users mailing list Pyusb-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/pyusb-users
