static int bfam_ts_adams_inter_rhs(const char *key, void *val, void *arg)
{
bfam_ts_adams_allprefix_t *data = (bfam_ts_adams_allprefix_t *)arg;
bfam_subdomain_t *sub = (bfam_subdomain_t *)val;
char prefix[BFAM_BUFSIZ];
snprintf(prefix, BFAM_BUFSIZ, "%s%d_", BFAM_ADAMS_PREFIX,
data->ts->currentStage % data->ts->nStages);
BFAM_LDEBUG("Adams inter: using prefix %s", prefix);
data->ts->inter_rhs(sub, prefix, prefix, "", data->ts->t);
return 1;
}
static inline int
bfam_ts_adams_do_update(bfam_subdomain_t* sub, const bfam_long_real_t* A,
const bfam_ts_adams_t* ts, const bfam_long_real_t dt, const int nStages)
{
BFAM_LDEBUG("BFAM_TS_ADAMS_DO_UPDATE");
/* Loop through the stages to scale rates and add in */
/*
* nStages is the computing number of stages whereas ts->nStages is the
* storage number of stages
*/
for(int k = 0; k < nStages;k++)
{
char prefix[BFAM_BUFSIZ];
snprintf(prefix,BFAM_BUFSIZ,"%s%d_",BFAM_ADAMS_PREFIX,
(ts->currentStage+ts->nStages-k)%ts->nStages);
BFAM_LDEBUG("Adams step: stage %d of %d using prefix %s",k,nStages,prefix);
ts->add_rates(sub, "", "", prefix, dt*A[k]);
}
return 1;
}
void bfam_ts_adams_free(bfam_ts_adams_t *ts)
{
BFAM_LDEBUG("ADAMS FREE");
if (ts->lsrk != NULL)
{
bfam_ts_lsrk_free(ts->lsrk);
bfam_free(ts->lsrk);
}
ts->lsrk = NULL;
bfam_communicator_free(ts->comm);
bfam_free(ts->comm);
ts->comm = NULL;
bfam_dictionary_clear(&ts->elems);
/*
bfam_free_aligned(ts->A);
ts->A = NULL;
*/
ts->nStages = 0;
ts->t = NAN;
bfam_ts_free(&ts->base);
}
void bfam_ts_adams_init(
bfam_ts_adams_t *ts, bfam_domain_t *dom, bfam_ts_adams_method_t method,
bfam_domain_match_t subdom_match, const char **subdom_tags,
bfam_domain_match_t comm_match, const char **comm_tags, MPI_Comm mpicomm,
int mpitag, void *comm_data,
void (*aux_rates)(bfam_subdomain_t *thisSubdomain, const char *prefix),
void (*scale_rates)(bfam_subdomain_t *thisSubdomain,
const char *rate_prefix, const bfam_long_real_t a),
void (*intra_rhs)(bfam_subdomain_t *thisSubdomain, const char *rate_prefix,
const char *minus_rate_prefix, const char *field_prefix,
const bfam_long_real_t t),
void (*inter_rhs)(bfam_subdomain_t *thisSubdomain, const char *rate_prefix,
const char *minus_rate_prefix, const char *field_prefix,
const bfam_long_real_t t),
void (*add_rates)(bfam_subdomain_t *thisSubdomain,
const char *field_prefix_lhs,
const char *field_prefix_rhs, const char *rate_prefix,
const bfam_long_real_t a),
const int RK_init)
{
BFAM_LDEBUG("ADAMS INIT");
/*
* set up some preliminaries
*/
bfam_ts_init(&ts->base, dom);
bfam_dictionary_init(&ts->elems);
ts->t = BFAM_LONG_REAL(0.0);
ts->base.step = &bfam_ts_adams_step;
/*
* store the function calls
*/
ts->scale_rates = scale_rates;
ts->intra_rhs = intra_rhs;
ts->inter_rhs = inter_rhs;
ts->add_rates = add_rates;
ts->currentStage = 0;
ts->numSteps = 0;
ts->lsrk = NULL;
switch (method)
{
default:
BFAM_WARNING("Invalid Adams scheme, using ADAMS_3");
case BFAM_TS_ADAMS_3:
ts->nStages = 3;
/*
ts->A = bfam_malloc_aligned(ts->nStages*sizeof(bfam_long_real_t));
ts->A[0] = BFAM_LONG_REAL(23.0)/
BFAM_LONG_REAL(12.0);
ts->A[1] = BFAM_LONG_REAL(-4.0)/
BFAM_LONG_REAL( 3.0);
ts->A[2] = BFAM_LONG_REAL( 5.0)/
BFAM_LONG_REAL(12.0);
*/
/* if necessary initialize the RK scheme */
if (RK_init)
{
ts->lsrk = bfam_ts_lsrk_new_extended(
dom, BFAM_TS_LSRK_KC54, subdom_match, subdom_tags, comm_match,
comm_tags, mpicomm, mpitag, comm_data, aux_rates, scale_rates,
intra_rhs, inter_rhs, add_rates, 0);
}
break;
case BFAM_TS_ADAMS_1:
ts->nStages = 1;
/*
ts->A = bfam_malloc_aligned(ts->nStages*sizeof(bfam_long_real_t));
ts->A[0] = BFAM_LONG_REAL(1.0);
*/
/* if necessary initialize the RK scheme */
if (RK_init)
{
ts->lsrk = bfam_ts_lsrk_new_extended(
dom, BFAM_TS_LSRK_FE, subdom_match, subdom_tags, comm_match,
comm_tags, mpicomm, mpitag, comm_data, aux_rates, scale_rates,
intra_rhs, inter_rhs, add_rates, 0);
}
break;
case BFAM_TS_ADAMS_2:
ts->nStages = 2;
/*
ts->A = bfam_malloc_aligned(ts->nStages*sizeof(bfam_long_real_t));
ts->A[0] = BFAM_LONG_REAL( 3.0)/
BFAM_LONG_REAL( 2.0);
ts->A[1] = BFAM_LONG_REAL(-1.0)/
BFAM_LONG_REAL( 2.0);
*/
/* if necessary initialize the RK scheme */
if (RK_init)
{
ts->lsrk = bfam_ts_lsrk_new_extended(
dom, BFAM_TS_LSRK_HEUN, subdom_match, subdom_tags, comm_match,
comm_tags, mpicomm, mpitag, comm_data, aux_rates, scale_rates,
intra_rhs, inter_rhs, add_rates, 0);
}
break;
case BFAM_TS_ADAMS_4:
ts->nStages = 4;
/*
ts->A = bfam_malloc_aligned(ts->nStages*sizeof(bfam_long_real_t));
ts->A[0] = BFAM_LONG_REAL( 55.0)/
BFAM_LONG_REAL( 24.0);
ts->A[1] = BFAM_LONG_REAL(-59.0)/
BFAM_LONG_REAL( 24.0);
ts->A[2] = BFAM_LONG_REAL( 37.0)/
BFAM_LONG_REAL( 24.0);
ts->A[3] = BFAM_LONG_REAL( 3.0)/
BFAM_LONG_REAL( 8.0);
*/
/* if necessary initialize the RK scheme */
if (RK_init)
{
ts->lsrk = bfam_ts_lsrk_new_extended(
dom, BFAM_TS_LSRK_KC54, subdom_match, subdom_tags, comm_match,
comm_tags, mpicomm, mpitag, comm_data, aux_rates, scale_rates,
intra_rhs, inter_rhs, add_rates, 0);
}
break;
}
/*
* get the subdomains and create rates we will need
*/
bfam_subdomain_t *subs[dom->numSubdomains + 1];
bfam_locidx_t numSubs = 0;
bfam_domain_get_subdomains(dom, subdom_match, subdom_tags, dom->numSubdomains,
subs, &numSubs);
for (int s = 0; s < numSubs; s++)
{
int rval = bfam_dictionary_insert_ptr(&ts->elems, subs[s]->name, subs[s]);
BFAM_ABORT_IF_NOT(rval != 1, "Issue adding subdomain %s", subs[s]->name);
for (int n = 0; n < ts->nStages; n++)
{
char aux_rates_name[BFAM_BUFSIZ];
snprintf(aux_rates_name, BFAM_BUFSIZ, "%s%d_", BFAM_ADAMS_PREFIX, n);
aux_rates(subs[s], aux_rates_name);
}
}
/*
* Set up the communicator we will use
*/
ts->comm = bfam_communicator_new(dom, comm_match, comm_tags, mpicomm, mpitag,
comm_data);
}
void bfam_ts_adams_step(bfam_ts_t *a_ts, bfam_long_real_t dt)
{
/* cast to the proper type */
bfam_ts_adams_t *ts = (bfam_ts_adams_t *)a_ts;
bfam_ts_adams_allprefix_t data;
data.ts = ts;
data.dt = dt;
/*
* start the communication
*/
bfam_communicator_start(ts->comm);
/*
* do the intra work
*/
bfam_dictionary_allprefixed_ptr(&ts->elems, "", &bfam_ts_adams_intra_rhs,
&data);
/*
* finish the communication
*/
bfam_communicator_finish(ts->comm);
/*
* do the inter work
*/
bfam_dictionary_allprefixed_ptr(&ts->elems, "", &bfam_ts_adams_inter_rhs,
&data);
if (ts->lsrk)
{
/*
* If we are using RK, we want to tell the RK scheme to use the next rate
* for storage (not the current rate which is valid
*/
ts->lsrk->t = ts->t;
char rate_prefix[BFAM_BUFSIZ];
snprintf(rate_prefix, BFAM_BUFSIZ, "%s%d_", BFAM_ADAMS_PREFIX,
(ts->currentStage + 1) % ts->nStages);
BFAM_LDEBUG("Adams step: RK rate rate_prefix %s", rate_prefix);
BFAM_ASSERT(ts->lsrk->step_extended);
ts->lsrk->step_extended((bfam_ts_t *)ts->lsrk, dt, rate_prefix, "", "");
if (ts->numSteps + 2 >= ts->nStages)
{
bfam_ts_lsrk_free(ts->lsrk);
bfam_free(ts->lsrk);
ts->lsrk = NULL;
}
}
else
/* q_{n+1} := q_{n} + dt \sum_{k=0}^{m} a_{k} dq_{n-k} */
bfam_dictionary_allprefixed_ptr(&ts->elems, "", &bfam_ts_adams_update,
&data);
/* shift the stage counter */
ts->currentStage = (ts->currentStage + 1) % ts->nStages;
ts->numSteps++;
/* update the stage time */
ts->t += dt;
}
