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High CPU load when network traffic page left open #768
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Is this only an issue with master (regression) or also a problem if you run 25.0 or 25.1rc1? |
This also appears to occur for me on v25.0, So not a regression on master. e.g. with the following graph: I see CPU thrashing of 50 - 90%, and get this similar-looking perf report: https://tmp.256k1.dev/23_10_bitcoin_qt_25.0_cpu.svg |
Which version of qt? Does it also happen with a previous release (statically compiled)? |
Sorry for the slow reply, these were both compiled with libqt5gui5 version 5.15.8+dfsg-3. Which previous release would you like me to try? |
any previous release, or the 26.0rc1 (I am only wondering about guix compilation vs local compilation) |
Tested again with 26.0rc2 binary from bitcoincore.org, and the issue is still present for me. So long as the graph content is relatively "varied", then one CPU constantly thrashes between ~60-100%. Seems to happen even more readily if I set the scale to 5m where even with fewer data points shown (I think) it pretty much just pins a single core to 100% I guess it's possible that this is something specific to my setup, and not a Bitcoin Core/QT issue; if so then I'm not too worried as I don't use the QT program that often (and don't need to leave the network traffic page open in any case). Let me know if there's anything else useful I can do to help debug. I think first it might be good to have a reproduction from someone else... |
Is there an existing issue for this?
Current behaviour
Possibly related to #466
Running
Bitcoin Core version v25.99.0-04265ba9378e
When running
bitcoin-qt
with an additionalnetwork traffic
window open, after some time CPU usage on a single core starts to thrash between 60-100%. The CPU thrashing will (immediately) drop when thenetwork traffic
window is closed.Expected behaviour
Viewing the
network traffic
page should not use 100% CPU or cause thrashing.Steps to reproduce
steps
bitcoin-qt
, opennetwork traffic
and wait some time? I think the graph needs to include a wide range of datapoints for this (rendering?) bug to occur (see below screenshots).actions
I ran
perf
for 30 seconds onbitcoin-qt
while CPU was thrashing, but it seemed to only show a lot of time spent inlibQT5Gui.so
, which doesn't seem particularly helpful.I noticed that the CPU spikes seem to only be present when the graph is well-populated with many variously-valued data points, like this:
However CPU usage drops if there is a large spike in network activity, which causes a low level of datapoint variation (plus one large spike), like this:
Relevant log output
Nothing of interest was present in the logs.
How did you obtain Bitcoin Core
Compiled from source
What version of Bitcoin Core are you using?
v25.99.0-04265ba9378e
Operating system and version
Ubuntu 23.04
Machine specifications
OS: Ubuntu 23.04 x86_64
CPU: 11th Gen Intel i7-11700K (16) @ 3.800GHz
GPU: NVIDIA GeForce RTX 3060 Ti
Memory: 64162MiB
HDD: Samsung SSD 990 PRO 2TB
MB: Z590 AORUS ELITE AX
Kernel: 6.2.0-33-generic
Resolution: 3840x2160
WM: i3
Terminal: tmux
Shell: fish 3.6.1
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