microsoft/Terminal
[Performance] Replace std::vector with more lightweight structure in `RenderData::GetPatternId`
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#10,564 创建于 2021年7月6日
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描述
This is about the scrolling test in #10563. A simplified repro would be:
time bash -c 'yes | head -n1000000'
which takes 7-8s with windows terminal and 300ms with gnome terminal.
Test case provided by @lhecker.
These lines show up in the hot paths of the trace of OpenConsole:
https://github.com/microsoft/terminal/blob/main/src/renderer/base/renderer.cpp#L788

It appears that simply constructing empty std::vector (empty because this is in conhost/OpenConsole) is quite expensive.
CC @PankajBhojwani