Bug 75826 - Conditional Formats using STYLE(...) suck cpu when doing "nothing"
Summary: Conditional Formats using STYLE(...) suck cpu when doing "nothing"
Status: RESOLVED DUPLICATE of bug 95233
Alias: None
Product: LibreOffice
Classification: Unclassified
Component: Calc (show other bugs)
(earliest affected) release
Hardware: x86-64 (AMD64) Linux (All)
: high major
Assignee: Not Assigned
: 54920 (view as bug list)
Depends on:
Reported: 2014-03-06 08:27 UTC by Jim Avera
Modified: 2016-03-28 17:26 UTC (History)
3 users (show)

See Also:
Crash report or crash signature:
Regression By:

.ods spreadsheet which burns 80% CPU when "idle" (113.53 KB, application/x-vnd.oasis.opendocument.spreadsheet)
2014-03-06 08:27 UTC, Jim Avera

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Description Jim Avera 2014-03-06 08:27:35 UTC
Created attachment 95212 [details]
.ods spreadsheet which burns 80% CPU when "idle"

LO Calc uses 80% CPU or more when sitting "idle" if Conditional Formats are used in conjunction with STYLE(...).   I'm using this to style rows of data depending on a key value in one of the columns, while leading the other columns containing "plain data" the user can easliy change.

The load increases with the number of cond-formatted cells... it' as if some background thread continually re-evaluates all the Cond. Fmt formulas for all the cells even though no data is changing anywhere.

Attached is a demo .ods file.   It contains a VLOOKUP table in A1:B3 followed by a large array of sample data.  The data cells all have same conditional format with

   Formula: STYLE(VLOOKUP($A$1:$A$9999, $A$1:$B$3, 2, 0))

   (The "apply style" is irrrelevant because STYLE() always returns false)

Please try the attached demo.
Comment 1 Jim Avera 2014-03-06 08:29:26 UTC
Alright, would somebody please post how to attach a .ods document and have it not be stored as text.  The file type drop-downs don't offer any ODF formats as an option...
Comment 2 Joel Madero 2014-03-07 01:39:00 UTC
In the future "auto detect" will do it :)
Comment 3 Joel Madero 2014-03-07 01:57:42 UTC
Same behavior on so updating version. I've asked Markus about this to see what he thinks - might be expected. 

Also for attachments - FDO has a bug where you can't auto detect the first attachment so apologies for that :)
Comment 4 Markus Mohrhard 2014-03-07 09:17:40 UTC
STYLE + Conditional Formatting is sadly a bad combination right now.

At some point I need to profile what is going wrong and fix it properly.
Comment 5 Joel Madero 2014-03-07 16:04:29 UTC
Thanks Markus - marking as NEW
Comment 6 QA Administrators 2015-06-08 14:41:55 UTC
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Comment 7 Jim Avera 2015-06-09 00:56:39 UTC
Tried and it still sucks CPU cycles just sitting idle.

"top" on Linux shows soffice.bin varying from 61% to 98%
Comment 8 m.a.riosv 2015-10-31 15:15:37 UTC
*** Bug 54920 has been marked as a duplicate of this bug. ***
Comment 9 Markus Mohrhard 2016-03-28 15:09:58 UTC
As explained in the other bug report I currently don't consider this behavior a bug and instead consider using STYLE inside of a conditional format function an user error (one that we can possibly avoid by causing a formula compilation error).

*** This bug has been marked as a duplicate of bug 95233 ***
Comment 10 Jim Avera 2016-03-28 17:26:33 UTC
Hi Marcus,

Would you please post more about why this is a user error (or unreasonable use)?
I read your comment#7 in bug 95233, but don't yet understand why STYLE() in a conditional format is inherently a problem.

You said "Now as STYLE changes the cell we of course need to recalculate the conditional format again"

... Yes, that would be true if the cell kept changing.  The problem is that
infinite re-calculation keeps happening even when the cell does NOT change
value, i.e., after all cells have reached the intended steady state.   That's
the bug as I understand it.