Bug 104892 - Adding a bunch of very small images (jpg/png) will cause a high CPU load
Summary: Adding a bunch of very small images (jpg/png) will cause a high CPU load
Status: NEW
Alias: None
Product: LibreOffice
Classification: Unclassified
Component: Impress (show other bugs)
(earliest affected) release
Hardware: All All
: low trivial
Assignee: Not Assigned
Keywords: bibisected, bisected, perf, regression
Depends on:
Blocks: Performance CPU-AT-100%
  Show dependency treegraph
Reported: 2016-12-23 19:14 UTC by Telesto
Modified: 2024-04-25 06:39 UTC (History)
3 users (show)

See Also:
Crash report or crash signature:

Bunch of small images (206.76 KB, application/zip)
2016-12-23 19:17 UTC, Telesto

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Description Telesto 2016-12-23 19:14:30 UTC
Adding a bunch of small 8-16kb images at once will cause a high CPU load. 

Steps to Reproduce:
1.Download and extract the attached zip
2.Open Impress (empty sheet)
3.Add the extract images to a slide with drag & drop. Monitor disk and CPU usage

Actual Results:  
Maximal CPU load for 5-8 seconds

Expected Results:
CPU load of 7% for 2 seconds

Reproducible: Always

User Profile Reset: No

Additional Info:
Found in:
Build ID: 9cfb2f2f03b5ec086487fd483298466db0b09010
CPU Threads: 4; OS Version: Windows 6.19; UI Render: default; 
TinderBox: Win-x86@42, Branch:master, Time: 2016-12-20_23:58:02
Locale: nl-NL (nl_NL); Calc: CL

and in
Build ID: 490fc03b25318460cfc54456516ea2519c11d1aa
Locale: nl-NL (nl_NL)

but not in:
Build ID: 37b43f919e4de5eeaca9b9755ed688758a8251fe
Locale: en-US (nl_NL)

User-Agent: Mozilla/5.0 (Windows NT 6.2; WOW64; rv:45.0) Gecko/20100101 Firefox/45.0
Comment 1 Telesto 2016-12-23 19:17:32 UTC
Created attachment 129907 [details]
Bunch of small images
Comment 2 Buovjaga 2016-12-31 18:35:07 UTC
I repro, but only, if I drag'n'drop all of them at once. On Linux, the time of the CPU load is only a couple of secs. On Win it was more like that 5-8 secs.

Arch Linux 64-bit, KDE Plasma 5
Build ID: fc0d4e6bc43d5f982452df07930f5ecf5927ad22
CPU Threads: 8; OS Version: Linux 4.8; UI Render: default; VCL: kde4; 
Locale: fi-FI (fi_FI.UTF-8); Calc: group
Built on December 31st 2016

Win 10
Build ID: 7ed40deee74a9869b7da073ad473241187420ff8
CPU Threads: 4; OS Version: Windows 6.19; UI Render: default; 
TinderBox: Win-x86@42, Branch:master, Time: 2016-12-30_23:18:54
Locale: fi-FI (fi_FI); Calc: group
Comment 3 QA Administrators 2018-01-01 03:26:48 UTC Comment hidden (obsolete)
Comment 4 Buovjaga 2018-05-30 19:23:32 UTC
Bisected to https://cgit.freedesktop.org/libreoffice/core/commit/?id=187445b2d2885ced92be37ffb11cd2a9bb11f8d6

commit 187445b2d2885ced92be37ffb11cd2a9bb11f8d6 (patch)
tree 1aef8d03508376156d4f987083a9f148da4602f5
parent 77cc71476bae2b3655102e2c29d36af40a393201 (diff)
Uno api sidebar unit test tdf#91806
- python test subsequentcheck
- correct deck setTitle APi (UI update)
- enhance UnoInProcess for flexiility in loading parameter

Change-Id: Id04cb78c6162ac84fb3bfd8577f84763109d993e
Reviewed-on: https://gerrit.libreoffice.org/16180

It seemed weird at first, so I checked out the commit and also the previous and the result matched the bisect. Must be the sidebar resource manager stuff.

Adding Laurent to CC
Comment 5 Xisco Faulí 2018-06-05 19:06:27 UTC
Adding Cc: to Laurent Godard
Comment 6 QA Administrators 2019-06-06 02:55:10 UTC Comment hidden (obsolete)
Comment 7 QA Administrators 2022-08-12 03:49:47 UTC
Dear Telesto,

To make sure we're focusing on the bugs that affect our users today, LibreOffice QA is asking bug reporters and confirmers to retest open, confirmed bugs which have not been touched for over a year.

There have been thousands of bug fixes and commits since anyone checked on this bug report. During that time, it's possible that the bug has been fixed, or the details of the problem have changed. We'd really appreciate your help in getting confirmation that the bug is still present.

If you have time, please do the following:

Test to see if the bug is still present with the latest version of LibreOffice from https://www.libreoffice.org/download/

If the bug is present, please leave a comment that includes the information from Help - About LibreOffice.
If the bug is NOT present, please set the bug's Status field to RESOLVED-WORKSFORME and leave a comment that includes the information from Help - About LibreOffice.

Please DO NOT

Update the version field
Reply via email (please reply directly on the bug tracker)
Set the bug's Status field to RESOLVED - FIXED (this status has a particular meaning that is not 
appropriate in this case)

If you want to do more to help you can test to see if your issue is a REGRESSION. To do so:
1. Download and install oldest version of LibreOffice (usually 3.3 unless your bug pertains to a feature added after 3.3) from https://downloadarchive.documentfoundation.org/libreoffice/old/

2. Test your bug
3. Leave a comment with your results.
4a. If the bug was present with 3.3 - set version to 'inherited from OOo';
4b. If the bug was not present in 3.3 - add 'regression' to keyword

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Warm Regards,
QA Team