https://bugs.documentfoundation.org/show_bug.cgi?id=131486
Bug ID: 131486
Summary: LibreOffice Calc freezes itself and Gnome 3.36 on
multiple cell select
Product: LibreOffice
Version: 6.4.1.2 release
Hardware: All
OS: Linux (All)
Status: UNCONFIRMED
Severity: normal
Priority: medium
Component: Calc
Assignee: libreoffice-bugs@lists.freedesktop.org
Reporter: bughat...@protonmail.com
Description:
There is a high cost to selecting cells in Calc. It appears to linearly scale
with the amount of cells already selected. I do not understand either of these
facts.
Calc also is apparently not using the disk at this time.
Steps to Reproduce:
1. Open a new spreadsheet in LibreOffice Calc (within Arch Linux) (on Gnome
3.36).
2. Select n cells in different columns by left clicking while holding Ctrl. n
is the number of cells such that selecting the n+1th cell takes at least 3
seconds. I estimate that n will be between 20 and 50 cells on your system.
3. Observe Calc using 100% of 1 CPU for several seconds. During this time you
should not be able to do anything else on your system aside from observe the
clock tick and an unclickable dialog box ask you if you wish to kill Calc do to
its non-responsiveness.
Actual Results:
Calc spends millions of microseconds on the task of a single cell select when
several cells are already selected.
Expected Results:
Calc spends at most 1 microsecond on the task of a single sell select
regardless of how many cells are already selected:
Check if the cell is selected in memory. If it is, then select the cell. If
not, then deselect the cell.
Reproducible: Always
User Profile Reset: No
Additional Info:
Version: 6.4.1.2
Build ID: 6.4.1-3
CPU threads: 16; OS: Linux 5.5; UI render: default; VCL: gtk3;
Locale: en-US (en_US.UTF-8); UI-Language: en-US
Calc: threaded
I am using X11 and the official Nvidia Linux drivers.
Why does the length of time to select a cell depend on the number of cells
already selected?
Why does your link on how to check if OpenGL is enabled wrong, because there is
no option "Use OpenGL for all rendering" under the specified section of the
settings?
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