This repository proposes a novel event-triggered communication algorithm in a parallel SOR solver for the pressure Poisson PDE for multiphase flows.
The sample coefficient files can be downloaded from here. The coeff1600.dat file has the coefficients for the 8 x 0.5 x 0.5 domain considered in the paper with a 1600 x 100 x 100 discretization. The simulation results reported in the paper are based on this file. The coeff800.dat file has the coefficients for the same domain but with a different discretization of 800 x 50 x 50. Note that the path to the file has to be changed and the first dimension has to be provided as the first runtime argument accordingly.
MPI (Message Passing Interface) is a dependency. Code for the three types of algorithms described in the paper below can be run as follows:
The baseline bulk synchronous parallel solver is implemented in sync.c. The runtime args are length of x dimension and a boolean for enabling log writing respectively. One example command is:
mpirun -np 200 ./sync 1600 0
The asynchronous parallel solver is a special case of the event-triggered communication solver implemented in event.c. The runtime args for the event-triggered solver are length of x dimension, horizon for event threshold, decay for event threshold, averaging filter length at sender, averaging filter length at receiver and a boolean for enabling log writing respectively. If a horizon or decay of 0 is selected, it leads to a threshold of 0 and thus it yields the asynchronous solver. Note that the averaging filter lengths at sender and receiver are redundant here. An example run command is:
mpirun -np 200 ./event 1600 0 0 20 20 0
The event-triggered communication solver is the main focus of this repository and is implemented in event.c. As stated before, the runtime args here are length of x dimension, horizon for event threshold, decay for event threshold, averaging filter length at sender, averaging filter length at receiver and
a boolean for enabling log writing respectively. An example run command is:
mpirun -np 200 ./event 1600 200 0.5 20 20 0