OilfieldToolsNet/opm-simulators
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This commit is contained in:
tqiu
2021-01-19 11:06:39 +01:00
parent 123e3fa89e
commit 48ebef7808
1 changed files with 8 additions and 5 deletions
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13
opm/simulators/linalg/bda/BILU0.cpp
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@@ -185,7 +185,7 @@ namespace bda
for (int ij = iRowStart; ij < iRowEnd; ij++) {
int j = LUmat->colIndices[ij];
if (i <= j) {
Ut->rowPointers[j+1]++; // actually colPointers
Ut->rowPointers[j+1]++; // actually colPointers, now simply indicates how many blocks this col holds
} else {
Lmat->colIndices[num_blocks_L] = j;
std::copy(LUmat->nnzValues + ij * bs * bs, LUmat->nnzValues + (ij+1) * bs * bs, Lmat->nnzValues + num_blocks_L * bs * bs);
@@ -196,7 +196,7 @@ namespace bda
Lmat->rowPointers[i+1] = num_blocks_L;
}
// prefix sum
// prefix sum to sum rowsizes into colpointers
std::partial_sum(Ut->rowPointers, Ut->rowPointers+Nb+1, Ut->rowPointers);
// for every row
@@ -207,7 +207,7 @@ namespace bda
for (int ij = iRowStart; ij < iRowEnd; ij++) {
int j = LUmat->colIndices[ij];
if (i <= j){
int idx = Ut->rowPointers[j]++;
int idx = Ut->rowPointers[j]++; // rowPointers[i] is (mis)used as the write offset of the current row i
Ut->colIndices[idx] = i; // actually rowIndices
memcpy(Ut->nnzValues + idx * bs * bs, LUmat->nnzValues + ij * bs * bs, sizeof(double) * bs * bs);
}
@@ -216,6 +216,7 @@ namespace bda
// rotate
// the Ut->rowPointers were increased in the last loop
// now Ut->rowPointers[i+1] is at the same position as Ut->rowPointers[i] should have for a crs matrix. reset to correct expected value
for (int i = Nb; i > 0; --i) {
Ut->rowPointers[i] = Ut->rowPointers[i-1];
}
@@ -223,7 +224,8 @@ namespace bda
Opm::Detail::Inverter<bs> inverter;
// Utmp is needed for CPU and GPU decomposition, because U is transposed, and reversed at the end
// Utmp is needed for CPU and GPU decomposition, because U is transposed, and reversed after decomposition
// U will be reversed because it is used with backwards substitution, the last row is used first
// Ltmp is only needed for CPU decomposition, GPU creates GPU buffer for Ltmp
double *Utmp = new double[Ut->nnzbs * block_size * block_size];
@@ -273,6 +275,7 @@ namespace bda
// if row rowU1 is empty, skip row
if (jk < Lmat->rowPointers[rowU1+1]) {
int colL = Lmat->colIndices[jk];
// for every block on colU
for (int k = jColStart; k < ij; ++k) {
int rowU2 = Ut->colIndices[k];
while (colL < rowU2) {
@@ -385,7 +388,7 @@ namespace bda
std::rotate(ptr.begin(), ptr.end() - 1, ptr.end());
ptr.front() = 0;
// reversing the rows of U, because that is the order they are used in
// reversing the rows of U, because that is the order they are used in during ILU apply
int URowIndex = 0;
int offsetU = 0; // number of nnz blocks that are already copied to Umat
Umat->rowPointers[0] = 0;