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Bug 120793 - Utilizing one core when scrolling down using page/down up in multi page view, if automatic spell checking is active
Summary: Utilizing one core when scrolling down using page/down up in multi page view,...
Status: NEW
Alias: None
Product: LibreOffice
Classification: Unclassified
Component: Writer (show other bugs)
Version:
(earliest affected)
3.5.7.2 release
Hardware: All All
: medium normal
Assignee: Not Assigned
URL:
Whiteboard:
Keywords: perf
Depends on:
Blocks: Spell-Checking Scrolling-PageUpDown Multi-Page-View
  Show dependency treegraph
 
Reported: 2018-10-22 14:18 UTC by Telesto
Modified: 2020-08-17 20:04 UTC (History)
1 user (show)

See Also:
Crash report or crash signature:


Attachments
Example file (51.29 KB, application/vnd.oasis.opendocument.text)
2018-10-22 14:18 UTC, Telesto
Details

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Description Telesto 2018-10-22 14:18:43 UTC
Description:
Utilizing one core when scrolling down using page/down up in multi page view

Steps to Reproduce:
1. Open the attached file
2. 3 or more pages side by side
3. Hold page down and monitor CPU usage

Actual Results:
Utilizing 1 core 

Expected Results:
Bit more efficient of plain text


Reproducible: Always


User Profile Reset: No



Additional Info:
Found in
Version: 6.2.0.0.alpha0+
Build ID: 3846561f79cf9065abd9ca83c9fbfbe7e52e28e2
CPU threads: 4; OS: Windows 6.3; UI render: default; VCL: win; 
TinderBox: Win-x86@42, Branch:master, Time: 2018-10-20_23:33:00
Locale: nl-NL (nl_NL); Calc: CL

and in 3.5.7.2.
Comment 1 Telesto 2018-10-22 14:18:58 UTC
Created attachment 145907 [details]
Example file
Comment 2 Buovjaga 2019-02-18 16:34:33 UTC
I repro, but only if automatic spell checking is active. Can you confirm? Otherwise it is 65-70%.

Arch Linux 64-bit
Version: 6.3.0.0.alpha0+
Build ID: e77beebb0d839f5dc0d4f9c4fd7cc9b7ccfd0175
CPU threads: 8; OS: Linux 4.20; UI render: default; VCL: gtk3; 
Locale: fi-FI (fi_FI.UTF-8); UI-Language: en-US
Calc: threaded
Built on 16 February 2019
Comment 3 Telesto 2019-02-18 16:52:07 UTC
(In reply to Buovjaga from comment #2)
> I repro, but only if automatic spell checking is active. Can you confirm?
> Otherwise it is 65-70%.

Hmm.. the STR are not JMUX proof: CPU doesn't say anything.. So it's more about page down speed & tearing.. 

Most problematic with spell-check enabled, indeed. Without it's little marginal slower 
Btw, did I report this before.. you did measure 'a bug doc' of mine with page down a while ago?