Tried the same python minimal application with pyqt5 (qt 5.9.5) - and
no, it does not happen.
So it seems to be a QT4 problem somehow in connection to the gnome-
panel, because this does not happen with the same QT4 application and
fbpanel in the same environment.
stracing the gnome-panel with this pyqt5 app, a similar output is
logged, but not as frequent as with qt4:
restart_syscall(<... resuming interrupted poll ...>) = 1
recvmsg(3, {msg_name=NULL, msg_namelen=0,
msg_iov=[{iov_base="\34\0\260\202\275\2\0\0\21\2\0\0:\201\247\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0",
iov_len=4096}], msg_iovlen=1, msg_controllen=0, msg_flags=0}, 0) = 32
recvmsg(3, {msg_namelen=0}, 0) = -1 EAGAIN (Resource temporarily
unavailable)
recvmsg(3, {msg_namelen=0}, 0) = -1 EAGAIN (Resource temporarily
unavailable)
recvmsg(3, {msg_namelen=0}, 0) = -1 EAGAIN (Resource temporarily
unavailable)
recvmsg(3, {msg_namelen=0}, 0) = -1 EAGAIN (Resource temporarily
unavailable)
recvmsg(3, {msg_namelen=0}, 0) = -1 EAGAIN (Resource temporarily
unavailable)
recvmsg(3, {msg_namelen=0}, 0) = -1 EAGAIN (Resource temporarily
unavailable)
poll([{fd=3, events=POLLIN}, {fd=4, events=POLLIN}, {fd=6, events=POLLIN}], 3,
-1) = 1 ([{fd=3, revents=POLLIN}])
recvmsg(3, {msg_name=NULL, msg_namelen=0,
msg_iov=[{iov_base="\34\0\260\202\275\2\0\0\21\2\0\0R\324\247\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0",
iov_len=4096}], msg_iovlen=1, msg_controllen=0, msg_flags=0}, 0) = 32
recvmsg(3, {msg_namelen=0}, 0) = -1 EAGAIN (Resource temporarily
unavailable)
recvmsg(3, {msg_namelen=0}, 0) = -1 EAGAIN (Resource temporarily
unavailable)
recvmsg(3, {msg_namelen=0}, 0) = -1 EAGAIN (Resource temporarily
unavailable)
recvmsg(3, {msg_namelen=0}, 0) = -1 EAGAIN (Resource temporarily
unavailable)
recvmsg(3, {msg_namelen=0}, 0) = -1 EAGAIN (Resource temporarily
unavailable)
recvmsg(3, {msg_namelen=0}, 0) = -1 EAGAIN (Resource temporarily
unavailable)
poll([{fd=3, events=POLLIN}, {fd=4, events=POLLIN}, {fd=6, events=POLLIN}], 3,
-1
I attached the pyqt5 tray app if somebody wants to take a look at that.
But the CPU load disappears with QT5.
** Attachment added: "python-tray-qt5.tar.gz"
https://bugs.launchpad.net/ubuntu/+source/gnome-panel/+bug/1779663/+attachment/5159066/+files/python-tray-qt5.tar.gz
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https://bugs.launchpad.net/bugs/1779663
Title:
QT4 Tray application and CPU load in 18.04
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