From 0a532d47e46a0d7780b7b1bda8b57e762dda88ef Mon Sep 17 00:00:00 2001
From: Anton Khirnov <anton@khirnov.net>
Date: Fri, 4 Jan 2019 09:48:17 +0100
Subject: Make the cfl factor used for relaxation runtime-configurable.

---
 param.ccl                    | 6 ++++++
 src/maximal_slicing_axi_mg.c | 5 +++++
 2 files changed, 11 insertions(+)

diff --git a/param.ccl b/param.ccl
index 204a942..ec6f908 100644
--- a/param.ccl
+++ b/param.ccl
@@ -43,6 +43,12 @@ CCTK_REAL tol_residual "maximum absolute value of the residual"
     0: :: ""
 } 1e-12
 
+RESTRICTED:
+CCTK_REAL cfl_factor ""
+{
+    0: :: ""
+} 0.0
+
 RESTRICTED:
 CCTK_INT stats_every "print elliptic solver stats every <count> coarsest-level steps"
 {
diff --git a/src/maximal_slicing_axi_mg.c b/src/maximal_slicing_axi_mg.c
index 899ef35..c7d6d18 100644
--- a/src/maximal_slicing_axi_mg.c
+++ b/src/maximal_slicing_axi_mg.c
@@ -83,6 +83,7 @@ typedef struct MSMGContext {
     int nb_relax_post;
     int nb_relax_pre;
     double tol_residual;
+    double cfl_factor;
 
     CoordPatch *patches;
     int nb_patches;
@@ -246,6 +247,7 @@ static CoordPatch *get_coord_patch(MSMGContext *ms, int level)
     cp->solver->nb_cycles = ms->nb_cycles;
     cp->solver->nb_relax_post = ms->nb_relax_post;
     cp->solver->nb_relax_pre  = ms->nb_relax_pre;
+    cp->solver->cfl_factor    = ms->cfl_factor;
 
     cp->solver->opaque       = ms;
     cp->solver->log_callback = log_callback;
@@ -327,6 +329,7 @@ static void print_stats(MSMGContext *ms)
 
 static int context_init(cGH *gh, int fd_stencil, int maxiter, int nb_cycles,
                         int nb_relax_pre, int nb_relax_post, double tol_residual,
+                        double cfl_factor,
                         const char *loglevel_str,
                         MSMGContext **ctx)
 {
@@ -344,6 +347,7 @@ static int context_init(cGH *gh, int fd_stencil, int maxiter, int nb_cycles,
     ms->nb_relax_pre  = nb_relax_pre;
     ms->nb_relax_post = nb_relax_post;
     ms->tol_residual  = tol_residual;
+    ms->cfl_factor    = cfl_factor;
 
     for (int i = 0; i < ARRAY_ELEMS(log_levels); i++) {
         if (!strcmp(loglevel_str, log_levels[i].str)) {
@@ -888,6 +892,7 @@ void msa_mg_init(CCTK_ARGUMENTS)
 
     ret = context_init(cctkGH, fd_stencil, maxiter, nb_cycles,
                        nb_relax_pre, nb_relax_post, tol_residual,
+                       cfl_factor,
                        loglevel, &ms);
     if (ret < 0)
         CCTK_WARN(0, "Error initializing the solver context");
-- 
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