Improved XMLNode::~XMLNode perfomance #1044
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XMLNode::~XMLNode uses interface method DeleteChildren(), which iteratively removes the first child until the list is empty. Each single removal performs additional checks and keeps _firstChild and _lastChild links in a consistent state. This leads to a performance penalty. The proposed patch solves this problem by iterating the list of the children and directly destroying them without keeping links in a consistent state. The performance boost we gained on xmltest is: - 3% for my laptop (x86_64) - 9% for bananapi f3 board (riscv64)
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XMLNode::~XMLNode uses interface method DeleteChildren(), which iteratively removes the first child until the list is empty. Each single removal performs additional checks and keeps _firstChild and _lastChild links in a consistent state. This leads to a performance penalty.
The proposed patch solves this problem by iterating the list of the children and directly destroying them without keeping links in a consistent state.
The performance boost we gained on xmltest is: