trixi-framework/Trixi.jl

Calculate timestep only once for equations with constant propagation speed

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Aperta il 11 ott 2020

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enhancementgood first issueperformancetaal

Descrizione

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.

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Tech stack
Nessuno
Dominio
performance
Tipo issue
feature
DifficoltàQuanto dovrebbe essere impegnativa per un nuovo contributor.
4
Tempo stimatoTempo stimato per completare e verificare uno scope piccolo.
3-5 days
Stato attivitàQuanto è probabile che la issue sia ancora attiva e reviewable.
stale
ChiarezzaQuanto chiaramente la issue descrive problema, scope e risultato atteso.
needs investigation
Prerequisiti
Resolve Trixi.jl issue #215
Adatta ai principiantiQuanto la issue è adatta a contributor alla prima esperienza.
15
Direzione di ricerca
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.