[Libreoffice-bugs] [Bug 109335] New: OpenCL performance degradation

[bugzilla-daemon at bugs.documentfoundation.org]

https://bugs.documentfoundation.org/show_bug.cgi?id=109335

            Bug ID: 109335
           Summary: OpenCL performance degradation
           Product: LibreOffice
           Version: 5.0.3.2 release
          Hardware: x86-64 (AMD64)
                OS: Windows (All)
            Status: UNCONFIRMED
          Severity: normal
          Priority: medium
         Component: Calc
          Assignee: libreoffice-bugs at lists.freedesktop.org
          Reporter: lagonauta at gmail.com

Description:
On my nVidia GTX 750 Ti OpenCL performance degrades a lot after upgrading from
5.0.3.1 to 5.0.3.2 on the "Ground water" test document, from 440 ms to 28000
ms.

There is a similar performance degradation between 5.0.4.2 and 5.0.5.1 on the
"Dates worked" test document, from 100 ms to 2300 ms.

"Stock history" document did not suffer performance degradation on newer
versions.

I am using Calc with the default option, but in Brazilian Portuguese and with
the OpenCL "subset" option set to false, as for some reason OpenCL never works
when set to true (maybe locale bug?).


Steps to Reproduce:
1. Install LibreOffice
2. Enable OpenCL
2. Disable OpenCL subset of operations
3. Run "Dates worked.xlsm" or "Ground water daily.xls"

Actual Results:  
(After 5.0.5.1)
- Dates worked: 2291 ms to complete
- Ground water: 28000 ms to complete

Expected Results:
- Dates worked: 100 ms to complete
- Ground water: 440 ms to complete



Reproducible: Always

User Profile Reset: No

Additional Info:


User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36
(KHTML, like Gecko) Chrome/52.0.2743.116 Safari/537.36 Edge/15.15063

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