[Libreoffice-bugs] [Bug 118431] New: soffice.bin continuous 100% CPU load when working on large documents

[bugzilla-daemon at bugs.documentfoundation.org]

https://bugs.documentfoundation.org/show_bug.cgi?id=118431

            Bug ID: 118431
           Summary: soffice.bin continuous 100% CPU load when working on
                    large documents
           Product: LibreOffice
           Version: 6.0.3.2 release
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: UNCONFIRMED
          Severity: normal
          Priority: medium
         Component: LibreOffice
          Assignee: libreoffice-bugs at lists.freedesktop.org
          Reporter: frank at silverwolfmedia.com

Description:
When working  on large documents (e.g. in writer, 200 pages of text with two
dozen or so images) the soffice.bin process persistently shows a 100% CPU load.
Closing all documents solves the problem, reopening them restores it, but not
immediately.

This occurred with previous versions on Ubuntu Linux 12.04 (old laptop with
single core and little memory) and still occurs on Ubununtu Linux 18.04 (new
laptop with 8 gig RAM and quad core I5).

This is not trivial as it reduces battery life on my laptop from 6.5 to 2.5
hours or less.

No advanced settings have been found to affect the problem or provide a
solution.

The system has enough spare RAM that swap file usage is minimal and core memory
usage is within normal limits. Excess memory allocation would force the system
into swapping, but this is not the case; it's a CPU load issue only.


Steps to Reproduce:
1. Start LO
2. Open or create a large document or several large documents (100+ pages with
some images) in Write or large, complex spreadsheets (1000+ cells in Calc)


Actual Results:
After some time (but not immediately) you will notice that something is causing
a high CPU load. This invariably turns out to be the soffice.bin process which
holds a single core at 100% regardless of activity. Close all documents. CPU
load will immediately drop to sensible levels (a few percent). Reopen
documents, wait a while, and high CPU load reoccurs (but once again, not
immediately) 

Expected Results:
CPU load should be a factor of application task load, not of memory
consumption. When SO is completely idle, the soffice.bin process should not
show a constant 100% CPU load


Reproducible: Always


User Profile Reset: Yes



Additional Info:
Version: 6.0.3.2
Build ID: 1:6.0.3-0ubuntu1
CPU threads: 8; OS: Linux 4.15; UI render: default; VCL: gtk3; 
Locale: en-ZA (en_US.UTF-8); Calc: group

Sample output of 'top' command (see soffice.bin process at top of list):

top - 10:31:17 up 7 days,  1:20,  1 user,  load average: 1.72, 1.51, 1.60
Tasks: 384 total,   2 running, 292 sleeping,   0 stopped,   1 zombie
%Cpu(s): 12.2 us,  0.7 sy,  0.0 ni, 86.9 id,  0.1 wa,  0.0 hi,  0.1 si,  0.0 st
KiB Mem :  8029492 total,   172296 free,  6218896 used,  1638300 buff/cache
KiB Swap: 33203196 total, 32590968 free,   612228 used.  1322736 avail Mem 

  PID USER      PR  NI    VIRT    RES    SHR S  %CPU %MEM     TIME+ COMMAND     
  397 frankvw   20   0 8587332 907868 113896 R 100.0 11.3   1318:06 soffice.bin 
 1745 frankvw   20   0 1328980 191504 159260 S   1.7  2.4  83:51.15 Xorg        
 2416 frankvw   20   0  655160  34808  24744 S   1.0  0.4  32:21.19 indicator-+ 
17572 frankvw   20   0  668976  27500  15856 S   0.7  0.3   0:01.81 gnome-term+ 
  339 frankvw   20   0   51468   3940   3076 R   0.3  0.0   0:00.12 top

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