[winswitch] winswitch uses 100% CPU

[McDermott, Chris Kevin (MSDU - HP Storage)]

Thanks Antione.  I've verified that I am running the patch which already includes the twisted patch.  

I attached gdb to the winswitch_server process and grabbed a backtrace.  Interestingly it looks like maybe it's a glib problem?

#0  0x0000003294cdf1b3 in poll () from /lib64/libc.so.6
#1  0x000000329643c655 in ?? () from /lib64/libglib-2.0.so.0
#2  0x000000329643cd55 in g_main_loop_run () from /lib64/libglib-2.0.so.0
#3  0x00007fb6c86ea791 in ?? () from /usr/lib64/python2.6/site-packages/gtk-2.0/glib/_glib.so
#4  0x000000320dcd5906 in PyEval_EvalFrameEx () from /usr/lib64/libpython2.6.so.1.0
#5  0x000000320dcd7647 in PyEval_EvalCodeEx () from /usr/lib64/libpython2.6.so.1.0
#6  0x000000320dcd5a94 in PyEval_EvalFrameEx () from /usr/lib64/libpython2.6.so.1.0
#7  0x000000320dcd6b7f in PyEval_EvalFrameEx () from /usr/lib64/libpython2.6.so.1.0
#8  0x000000320dcd6b7f in PyEval_EvalFrameEx () from /usr/lib64/libpython2.6.so.1.0
#9  0x000000320dcd6b7f in PyEval_EvalFrameEx () from /usr/lib64/libpython2.6.so.1.0
#10 0x000000320dcd7647 in PyEval_EvalCodeEx () from /usr/lib64/libpython2.6.so.1.0
#11 0x000000320dcd7722 in PyEval_EvalCode () from /usr/lib64/libpython2.6.so.1.0
#12 0x000000320dcf1b9c in ?? () from /usr/lib64/libpython2.6.so.1.0
#13 0x000000320dcf1c70 in PyRun_FileExFlags () from /usr/lib64/libpython2.6.so.1.0
#14 0x000000320dcf315c in PyRun_SimpleFileExFlags () from /usr/lib64/libpython2.6.so.1.0
#15 0x000000320dcff892 in Py_Main () from /usr/lib64/libpython2.6.so.1.0
#16 0x0000003294c1ed5d in __libc_start_main () from /lib64/libc.so.6
#17 0x0000000000400649 in _start ()


-----Original Message-----
From: shifter-users [mailto:shifter-users-bounces at lists.devloop.org.uk] On Behalf Of Antoine Martin
Sent: Wednesday, September 23, 2015 5:42 AM
To: shifter-users at lists.devloop.org.uk
Subject: Re: [winswitch] winswitch uses 100% CPU

On 22/09/15 03:35, McDermott, Chris Kevin (MSDU - HP Storage) wrote:
> I'm running winswitch on RHEL 6.4.  The winswitch-server and winswitch-stdio processes are both using approximately 100% CPU (core).
>
> I have read the FAQ on this http://winswitch.org/trac/ticket/90.
>
> I have patched pygtk2-2.16.0-3 Fedora source RPM with the patches https://bugzilla.redhat.com/attachment.cgi?id=477006 and https://bugzilla.redhat.com/attachment.cgi?id=477007 (more or less) and did an rpmbuild to produce a new binary RPM for pygtk2-2.16.0-3.el6.
>
> I've installed the new binary RPM and restarted winswitch.  The high CPU usage did not change.
>
> strace of winswitch_server shows
>
> poll([{fd=7, events=POLLIN}, {fd=3, events=POLLIN}, {fd=15, 
> events=POLLIN}, {fd=11, events=POLLIN}, {fd=5, events=POLLIN}, {fd=13, 
> events=POLLIN}, {fd=10, events=POLLIN}], 7, 38) = 1 ([{fd=3, 
> revents=POLLIN}]) poll([{fd=7, events=POLLIN}, {fd=3, events=POLLIN}, 
> {fd=15, events=POLLIN}, {fd=11, events=POLLIN}, {fd=5, events=POLLIN}, 
> {fd=13, events=POLLIN}, {fd=10, events=POLLIN}], 7, 38) = 1 ([{fd=3, 
> revents=POLLIN}]) poll([{fd=7, events=POLLIN}, {fd=3, events=POLLIN}, 
> {fd=15, events=POLLIN}, {fd=11, events=POLLIN}, {fd=5, events=POLLIN}, 
> {fd=13, events=POLLIN}, {fd=10, events=POLLIN}], 7, 36) = 1 ([{fd=3, 
> revents=POLLIN}]) poll([{fd=7, events=POLLIN}, {fd=3, events=POLLIN}, 
> {fd=15, events=POLLIN}, {fd=11, events=POLLIN}, {fd=5, events=POLLIN}, 
> {fd=13, events=POLLIN}, {fd=10, events=POLLIN}], 7, 35) = 1 ([{fd=3, 
> revents=POLLIN}])
>
> ad infinitum
>
> lsof shows this for fd 3
>
>     winswitch 16617  mcdermoc    3r     FIFO                0,8      0t0   93100 pipe
>
> strace of stdio is basically the same pattern - nothing but calls to poll(3).
>
> I am out of ideas.  Any help on a new direction which I could pursue would be greatly appreciated.
Have you verified that your patched libraries are being used and that they do fix the problem they are meant to fix?
There is a test case here (requires sending it a SIGCHLD):
https://bugzilla.gnome.org/show_bug.cgi?id=640738#c4
And another one here (requires Twisted):
http://twistedmatrix.com/trac/ticket/4658

The only alternative that I can think of is to upgrade to a newer CentOS release.
(those have the pygtk patches included - I believe)

Cheers
Antoine
>
> Thanks,
> Chris
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