https://bugs.kde.org/show_bug.cgi?id=476707
Bug ID: 476707
Summary: Bad performance on XY plot with ~200k data points
Classification: Applications
Product: LabPlot2
Version: unspecified
Platform: Archlinux
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: frontend
Assignee: alexander.se...@web.de
Reporter: chrismet...@binary-6.de
Target Milestone: ---
Created attachment 162944
--> https://bugs.kde.org/attachment.cgi?id=162944&action=edit
Raw, unmodified source data example
SUMMARY
Creating an XY plot of a ~200,000 double data points kills performance of
LabPlot. One CPU core will get stuck on 100% and almost no interaction will be
possible.
This seems to be caused by the automatic Y ticks being set to 10 major ticks
and 1 minor tick, resulting in one tick per data point, as turning off ticks
results in great performance.
STEPS TO REPRODUCE
1. Load in example source data as a spreadsheet
2. Remove columns 1 2 and 4 as they contain garbage data
3. Remove lines 1-4 as they contain garbage data
4. Create a new column with row numbers
5. Create an XY Plot with the row numbers on X and the double values on Y
OBSERVED RESULT
The plot is generated, but is fully "highlighted" with infinite ticks in Y.
Labplot basically hardlocks with 100% CPU usage.
EXPECTED RESULT
The plot is generated and performance stays good.
SOFTWARE/OS VERSIONS
```
Debug build
Sep 30 2023, 22:50:57
System: Arch Linux
Locale: C,Default (Decimal point '.', Group separator ','
Number settings: Decimal point '.', Group separator ',', Exponential 'e', Zero
digit '0', Percent '%', Positive/Negative sign '+'/'-' (Updated on restart)
Architecture: x86_64-little_endian-lp64
Kernel: linux 6.5.9-arch2-1
C++ Compiler: GNU 13.2.1
C++ Compiler Flags: -march=x86-64 -mtune=generic -O2 -pipe -fno-plt
-fexceptions -Wp,-D_FORTIFY_SOURCE=2 -Wformat -Werror=format-security
-fstack-clash-protection -fcf-protection -Wp,-D_GLIBCXX_ASSERTIONS -g
-ffile-prefix-map=/build/labplot/src=/usr/src/debug/labplot -flto=auto
-fno-operator-names -fno-exceptions -Wall -Wextra -Wcast-align
-Wchar-subscripts -Wformat-security -Wno-long-long -Wpointer-arith -Wundef
-Wnon-virtual-dtor -Woverloaded-virtual -Werror=return-type -Werror=init-self
-Wvla -Wdate-time -Wsuggest-override -Wlogical-op -Wall -Wextra -Wundef
-Wpointer-arith -Wunreachable-code -Wunused -Wdeprecated-declarations
-fno-omit-frame-pointer -fstack-protector -fexceptions -std=c++11 -O2
-Wcast-align -Wswitch-enum -fvisibility=default -pedantic
-Wzero-as-null-pointer-constant
```
```
-` chrismettal@mainframe
.o+` ---------------------
`ooo/ OS: Arch Linux x86_64
`+oooo: Host: X670E Steel Legend
`+oooooo: Kernel: 6.5.9-arch2-1
-+oooooo+: Uptime: 23 hours, 49 mins
`/:-:++oooo+: Packages: 1367 (pacman), 102 (flatpak)
`/++++/+++++++: Shell: bash 5.2.15
`/++++++++++++++: Resolution: 3440x1440
`/+++ooooooooooooo/` DE: Plasma 5.27.9
./ooosssso++osssssso+` WM: KWin
.oossssso-````/ossssss+` WM Theme: Breeze
-osssssso. :ssssssso. Theme: [Plasma], Dracula [GTK2/3]
:osssssss/ osssso+++. Icons: breeze-dark [Plasma],
breeze-dark [GTK2/3]
/ossssssss/ +ssssooo/- Terminal: konsole
`/ossssso+/:- -:/+osssso+- CPU: AMD Ryzen 9 7950X (32) @ 5.881GHz
`+sso+:-` `.-/+oso: GPU: AMD ATI 18:00.0 Raphael
`++:. `-/+/ GPU: AMD ATI Radeon RX 7900 XT/7900
XTX
.` `/ Memory: 10676MiB / 63410MiB
```
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