Description of problem: When not writing, before and after creation of USB media, the application CPU is very high. Version-Release number of selected component (if applicable): liveusb-creator-3.90.0-1.fc24.noarch How reproducible: Always Steps to Reproduce: 1. 2. 3. Actual results: top reports high CPU usage while the application is idle 13301 root 20 0 1076840 118852 64496 R 136.9 1.5 13:56.96 liveusb-creator Expected results: Should be much less than this when idle. Additional info:
Created attachment 1137284 [details] strace pid 13301
Created attachment 1137285 [details] strace pid 13304
Created attachment 1137286 [details] strace pid 13305
Created attachment 1137287 [details] strace pid 13307
Created attachment 1137288 [details] strace pid 13309
Created attachment 1148720 [details] liveusb-creator-3.92.1-1's CPU usage FYI, the high CPU usage is still present with 3.92.1-1 version.
Also reported here: https://github.com/lmacken/liveusb-creator/issues/43
liveusb-creator-3.93.1-1.fc24 has been submitted as an update to Fedora 24. https://bodhi.fedoraproject.org/updates/FEDORA-2016-ff4136b90c
liveusb-creator-3.93.1-1.fc24 has been pushed to the Fedora 24 testing repository. If problems still persist, please make note of it in this bug report. See https://fedoraproject.org/wiki/QA:Updates_Testing for instructions on how to install test updates. You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2016-ff4136b90c
This is not fixed with liveusb-creator-3.93.1-1.fc24. If you see "There are no portable drives connected" spinner, it eats 130% cpu. Even after you connect a drive and do nothing, it still eats 65% cpu. During writing, it eats 60% cpu. After writing has finished, it eats 100% cpu. All of that seems to be busy waiting.
liveusb-creator-3.93.2-1.fc24 has been submitted as an update to Fedora 24. https://bodhi.fedoraproject.org/updates/FEDORA-2016-ff4136b90c
Still not fixed in liveusb-creator-3.93.2-1.fc24. On my box with 4 CPU cores, the CPU usage is around 135% to 145%. And the Xorg process is at 80% when nothing other than liveusb-creator is active. Also, "ps -m PID" shows 9 threads, which is 5 too many. Four threads are enough: writer, reader, display, mouse. Only two of the threads accumulate CPU time, in the ratio 2:1 approximately.
liveusb-creator-3.93.2-1.fc24 has been pushed to the Fedora 24 testing repository. If problems still persist, please make note of it in this bug report. See https://fedoraproject.org/wiki/QA:Updates_Testing for instructions on how to install test updates. You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2016-ff4136b90c
I'd suspect this is caused by using graphics drivers with no 3D acceleration. On my machine, it uses around 4% of one core.
Nope, 3D works OK. My system is Thinkpad T450s: 00:02.0 VGA compatible controller: Intel Corporation HD Graphics 5500 (rev 09) OpenGL renderer string: Mesa DRI Intel(R) HD Graphics 5500 (Broadwell GT2) i965 driver However, I just tested it on a desktop with Radeon R9 270X (radeon driver) and I see only 10-15% cpu usage when showing the spinner (compared to 130% with intel). So this seems to be related to intel (and maybe just certain intel cards)? However, when writing, I still see 40%+ cpu usage even on the Radeon desktop machine.
I take my comment back. Even on the Radeon desktop machine, if I leave the spinner spinning, every second the CPU usage increases. After one minute, I have about 160% cpu usage. So there's the same issue as well, it just takes longer to manifest.
Ah, yes, I understood the report wrong. The spinning wheel in drive selection seems to be broken. Going to fix that.
liveusb-creator-3.93.3-1.fc24 has been submitted as an update to Fedora 24. https://bodhi.fedoraproject.org/updates/FEDORA-2016-ff4136b90c
CPU usage is now ok on bare metal (Intel). But it's still high (80-100% CPU) in QEMU with Fedora 22 (it will be probably same even in newer releases).
liveusb-creator-3.93.3-1.fc24 has been pushed to the Fedora 24 testing repository. If problems still persist, please make note of it in this bug report. See https://fedoraproject.org/wiki/QA:Updates_Testing for instructions on how to install test updates. You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2016-ff4136b90c
liveusb-creator-3.93.3-1.fc24 has been pushed to the Fedora 24 stable repository. If problems still persist, please make note of it in this bug report.
The cpu usage is fixed on my F24 bare metal when waiting for a flash drive, it was caused by the spinner. However, when writing it's still 50% and after writing has finished, it's at 30%, even when it is still.
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