The Ou Case

From Apache OpenOffice Wiki
< Calc‎ | Performance
Revision as of 20:03, 4 December 2010 by Gang65 (Talk | contribs)

(diff) ← Older revision | Latest revision (diff) | Newer revision → (diff)
Jump to: navigation, search

Performance 170.png
Performance Project

Quick Navigation




About this template

Loading a large plain data file takes very long.


Note that the numbers published in the article compare Excel .xls binary file format with Calc .ods, which is apples and oranges.


  • source/filter/xml/xmlsubti.cxx
    • 38% of time spent in ScMyTables::NewColumn() because of replicated use of aTableVec[nTableCount - 1] (vector::operator[])
      Note: percentage may be off due to compilation without optimization to obtain exact line numbers that may result in STLport's vector methods being differently compiled.
      • proposed fix: should obtain the pointer once instead.
    • Similar for other places where aTableVec[xxx] is used.
  • TODO: Check all ScMyTables::.*() and ScMyTableData::.*()
    • Especially for 63342857 calls to AddColumn() and NewColumn() that result in 1168654944 calls to operator[] ...
    • 63081776 calls to AddColumn() originate from ScXMLTableRowCellContext::EndElement()
    • Those are highly suspicious and seem to indicate that too many temporary elements are created for empty columns/cells (needs verification).
Personal tools