[Users] About SYNCs with staggered variables

Hi, community,

I was doing some benchmark tests for my version of GRHydro with TimerReport and I found that a lot of time in the code is spent in SYNCs for the staggered variables. Analogous to IllinoisGRMHD I have the following lines in the schedule.ccl

{

  SYNC:

GRHydro::em_Ax,GRHydro::em_Ay,GRHydro::em_Az,GRHydro::em_psi6phi LANG: C } "Schedule symmetries -- Actually just a placeholder function to ensure prolongations / processor syncs are done BEFORE outer boundaries are updated."

According to the timer, this takes 3 times more than other SYNCs. Is there a reason for this? Is it related to the prolongation operators for staggered variables?

Thanks for your help!

*Dr. Luciano Combi* Postdoctoral Researcher Perimeter Institute for Theoretical Physics CITA National Fellow (U. of Guelph) ---