int GaussSeidelPoisson1Drb(Vector u, double tol, int maxit)
{
int it=0, i, j;
double max = tol+1;
Vector b = cloneVector(u);
Vector r = cloneVector(u);
Vector v = cloneVector(u);
copyVector(b, u);
fillVector(u, 0.0);
while (max > tol && ++it < maxit) {
copyVector(v, u);
copyVector(u, b);
collectVector(v);
for (j=0;j<2;++j) {
#pragma omp parallel for schedule(static)
for (i=1+j;i<r->len-1;i+=2) {
u->data[i] += v->data[i-1];
u->data[i] += v->data[i+1];
r->data[i] = u->data[i]-(2.0+alpha)*v->data[i];
u->data[i] /= (2.0+alpha);
v->data[i] = u->data[i];
}
if (j == 0)
collectVector(v);
}
max = maxNorm(r);
}
freeVector(b);
freeVector(r);
freeVector(v);
return it;
}
int GaussJacobiPoisson1D(Vector u, double tol, int maxit)
{
int it=0, i;
Vector b = cloneVector(u);
Vector e = cloneVector(u);
copyVector(b, u);
fillVector(u, 0.0);
double max = tol+1;
while (max > tol && ++it < maxit) {
copyVector(e, u);
collectVector(e);
copyVector(u, b);
#pragma omp parallel for schedule(static)
for (i=1;i<e->len-1;++i) {
u->data[i] += e->data[i-1];
u->data[i] += e->data[i+1];
u->data[i] /= (2.0+alpha);
}
axpy(e, u, -1.0);
e->data[0] = e->data[e->len-1] = 0.0;
max = maxNorm(e);
}
freeVector(b);
freeVector(e);
return it;
}
void Poisson1D(Vector u, Vector v)
{
int i;
collectVector(v);
#pragma omp parallel for schedule(static)
for (i=1;i<u->len-1;++i) {
u->data[i] = (2.0+alpha)*v->data[i];
u->data[i] -= v->data[i-1];
u->data[i] -= v->data[i+1];
}
u->data[0] = u->data[u->len-1] = 0.0;
v->data[0] = v->data[v->len-1] = 0.0;
}
Vector collectBeforePre(Vector u)
{
collectVector(u);
Vector result;
if (u->comm_rank == 0) {
result=createVector(u->len-1);
int len=u->len-1;
dcopy(&len, u->data+1, &u->stride, result->data, &result->stride);
} else if (u->comm_rank == u->comm_size-1) {
result=createVector(u->len-1);
int len=u->len-1;
dcopy(&len, u->data, &u->stride, result->data, &result->stride);
} else {
result=createVector(u->len);
copyVector(result, u);
}
return result;
}
/***********************************************
* API to collect all data allocated by LinBox *
**********************************************/
void LinBoxCollect(){
collectVector();
collectBlackbox();
collectElement();
collectDomain();
}
