It was not a big task to convert my application to a qt5 app, which I did this afternoon. The CPU load is gone, now, and for me, this is the solution to my problem.
I appreciate your help, thanks! -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to gnome-panel in Ubuntu. https://bugs.launchpad.net/bugs/1779663 Title: QT4 Tray application and CPU load in 18.04 Status in gnome-panel package in Ubuntu: Incomplete Bug description: Ubuntu 18.04 LTS Session: gnome-flashback Tested with: gnome-panel: 3.26.0-1ubuntu5 / 3.28.0-1ubuntu1 (cosmic) We recognized a steady CPU load of about 2% when starting our QT4 tray application. To eliminate any issues in our application, we created a minimal python qt4 tray app (attached). As soon as this app is started, the gnome-panel process gets a CPU load of about 2%. When stracing the gnome-panel, we recognize a repeating log pattern: poll([{fd=3, events=POLLIN}, {fd=4, events=POLLIN}, {fd=6, events=POLLIN}], 3, 0) = 0 (Timeout) poll([{fd=3, events=POLLIN|POLLOUT}], 1, -1) = 1 ([{fd=3, revents=POLLOUT}]) writev(3, [{iov_base="\212\5\4\0f\26 \0\0\0\26\0\26\0\2\0\217\3\4\0U\1 \0f\26 \0\0\0\0\0"..., iov_len=40}, {iov_base=NULL, iov_len=0}, {iov_base="", iov_len=0}], 3) = 40 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, 13) = 0 (Timeout) poll([{fd=3, events=POLLIN|POLLOUT}], 1, -1) = 1 ([{fd=3, revents=POLLOUT}]) writev(3, [{iov_base="5 \4\0g\26 \0\3\0 \0\26\0\2\0\213\4\6\0h\26 \0g\26 \0&\0\0\0"..., iov_len=236}, {iov_base=NULL, iov_len=0}, {iov_base="", iov_len=0}], 3) = 236 recvmsg(3, {msg_name=NULL, msg_namelen=0, msg_iov=[{iov_base="[\2\353kT\1 \0U\1 \0\200)y\0\0\0\26\0\26\0\2\0\n\5h\3\26\0\30\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) poll([{fd=3, events=POLLIN}, {fd=4, events=POLLIN}, {fd=6, events=POLLIN}], 3, 0) = 0 (Timeout) poll([{fd=3, events=POLLIN|POLLOUT}], 1, -1) = 1 ([{fd=3, revents=POLLOUT}]) writev(3, [{iov_base="\212\5\4\0i\26 \0\0\0\26\0\26\0\2\0\217\3\4\0U\1 \0i\26 \0\0\0\0\0"..., iov_len=40}, {iov_base=NULL, iov_len=0}, {iov_base="", iov_len=0}], 3) = 40 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, 13) = 0 (Timeout) poll([{fd=3, events=POLLIN|POLLOUT}], 1, -1) = 1 ([{fd=3, revents=POLLOUT}]) writev(3, [{iov_base="5 \4\0j\26 \0\3\0 \0\26\0\2\0\213\4\6\0k\26 \0j\26 \0&\0\0\0"..., iov_len=236}, {iov_base=NULL, iov_len=0}, {iov_base="", iov_len=0}], 3) = 236 recvmsg(3, {msg_name=NULL, msg_namelen=0, msg_iov=[{iov_base="[\2\371kT\1 \0U\1 \0\217)y\0\0\0\26\0\26\0\2\0\n\5h\3\26\0\30\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) poll([{fd=3, events=POLLIN}, {fd=4, events=POLLIN}, {fd=6, events=POLLIN}], 3, 0) = 0 (Timeout) poll([{fd=3, events=POLLIN|POLLOUT}], 1, -1) = 1 ([{fd=3, revents=POLLOUT}]) The trayapp is doing nothing. Can anybody explain how to stop this behaviour in gnome-panel? Thanks! To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-panel/+bug/1779663/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
