trixi-framework/Trixi.jl

Calculate timestep only once for equations with constant propagation speed

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#216 建立於 2020年10月11日

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enhancementgood first issueperformancetaal

描述

For example, scalar advection and hyperbolic diffusion have constant propagation speeds, thus the time step needs to be calculated only once after each change of the mesh. This can be a performance improvement, especially when doing parallel simulations, where it saves one blocking collective communication per time step.

For this to work, first #215 needs to be resolved.

貢獻者指南

技術棧
無
領域
performance
議題類型
feature
難度面向新貢獻者的預計實作難度，1 表示很小改動，5 表示專家級工作。
4
預計時間有經驗貢獻者完成調查、實作、測試並準備 pull request 的粗略時間範圍。
3-5 days
活動狀態議題目前的可參與程度：新鮮、活躍、陳舊、阻塞或等待維護者輸入。
stale
清晰度議題是否清楚說明預期改動、驗收標準和下一步。
needs investigation
前置要求
Resolve Trixi.jl issue #215
新手友善度1-100 的估計分數，表示該議題對首次貢獻者的友善程度。
15
研究方向
First, issue #215 must be resolved. Then, identify the equations in Trixi.jl that have constant propagation speeds, such as scalar advection and hyperbolic diffusion. The timestep calculation logic is likely in the time integration routines. The goal is to compute the timestep only once per mesh change instead of every time step, which will save blocking collective communication in parallel simulations.