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replace some c++ with c

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This commit is contained in:
Michael Zhang 2023-11-25 03:18:40 +00:00
parent d0d0f8140a
commit d7d251bac5
2 changed files with 69 additions and 51 deletions
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3
assignments/03/Makefile
View file

@ -7,6 +7,9 @@ CFLAGS += -O3 -g
clean:
rm -f lpa
lpac: lpa.cpp
mpicc $(CFLAGS) $(LDFLAGS) -o $@ $<
lpa: lpa.cpp
mpic++ $(CFLAGS) $(LDFLAGS) -o $@ $<

117
assignments/03/lpa.cpp
View file

@ -36,9 +36,14 @@ void pair_vector_init(struct pair_vector *);
void pair_vector_clear(struct pair_vector *);
void pair_vector_push(struct pair_vector *v, int fst, int snd);
pair compute_node_range(int p, int total_num_nodes, int each_num_nodes,
int process);
int main(int argc, char **argv) {
MPI::Init(argc, argv);
int rank = MPI::COMM_WORLD.Get_rank(), p = MPI::COMM_WORLD.Get_size();
MPI_Init(&argc, &argv);
int rank, p;
MPI_Comm_rank(MPI_COMM_WORLD, &rank);
MPI_Comm_size(MPI_COMM_WORLD, &p);
MPI_Datatype IntPairType;
init_pair_type(&IntPairType);
@ -53,15 +58,15 @@ int main(int argc, char **argv) {
pair params;
if (rank == 0) {
printf("Hello\n");
fp = fopen(argv[1], "r");
if ((read = getline(&line, &len, fp)) != -1)
// Read the first line
if (getline(&line, &len, fp) != -1)
sscanf(line, "%d %d", &params.fst, &params.snd);
}
// Send the params
MPI_Bcast(&params, 1, IntPairType, 0, MPI::COMM_WORLD);
MPI_Bcast(&params, 1, IntPairType, 0, MPI_COMM_WORLD);
int total_num_nodes = params.fst;
int total_num_edges = params.snd;
int each_num_nodes = total_num_nodes / p;
@ -71,12 +76,12 @@ int main(int argc, char **argv) {
rank == p - 1 ? total_num_nodes - rank * each_num_nodes : each_num_nodes;
int my_nodes[num_my_nodes];
std::function<std::pair<int, int>(int)> node_range =
[p, total_num_nodes, each_num_nodes](int process) {
int start = process * each_num_nodes;
int end = process == p - 1 ? total_num_nodes : start + each_num_nodes;
return std::make_pair(start, end);
};
// std::function<std::pair<int, int>(int)> node_range =
// [p, total_num_nodes, each_num_nodes](int process) {
// int start = process * each_num_nodes;
// int end = process == p - 1 ? total_num_nodes : start +
// each_num_nodes; return std::make_pair(start, end);
// };
// Read the edges
int num_my_edges;
@ -90,30 +95,33 @@ int main(int argc, char **argv) {
// For the current process, what's the last node we're expecting to see?
int current_process = 0;
std::pair<int, int> current_node_range = node_range(current_process);
pair current_node_range =
compute_node_range(p, total_num_nodes, each_num_nodes, current_process);
int edge_counter = 0;
for (int i = 0; i < total_num_edges; ++i) {
getline(&line, &len, fp);
if (getline(&line, &len, fp) == -1)
break;
int fst, snd;
sscanf(line, "%d %d", &fst, &snd);
if (fst >= current_node_range.second) {
if (fst >= current_node_range.snd) {
if (current_process == 0) {
num_my_edges = edge_counter;
my_edges = (pair *)calloc(num_my_edges, sizeof(pair));
memcpy(my_edges, all_edges.ptr, edge_counter * sizeof(pair));
} else {
MPI_Send(&edge_counter, 1, MPI_INT, current_process,
TAG_SEND_NUM_EDGES, MPI::COMM_WORLD);
TAG_SEND_NUM_EDGES, MPI_COMM_WORLD);
MPI_Send(all_edges.ptr, edge_counter, IntPairType, current_process,
TAG_SEND_EDGES, MPI::COMM_WORLD);
TAG_SEND_EDGES, MPI_COMM_WORLD);
}
// We're starting on the next process
current_process += 1;
current_node_range = node_range(current_process);
current_node_range = compute_node_range(
p, total_num_nodes, each_num_nodes, current_process);
edge_counter = 0;
pair_vector_clear(&all_edges);
}
@ -125,15 +133,17 @@ int main(int argc, char **argv) {
// We have to send the last one again here, since it didn't get caught in
// the loop above
MPI_Send(&edge_counter, 1, MPI_INT, current_process, TAG_SEND_NUM_EDGES,
MPI::COMM_WORLD);
MPI_COMM_WORLD);
MPI_Send(all_edges.ptr, edge_counter, IntPairType, current_process,
TAG_SEND_EDGES, MPI::COMM_WORLD);
TAG_SEND_EDGES, MPI_COMM_WORLD);
free(all_edges.ptr);
} else {
MPI_Recv(&num_my_edges, 1, MPI_INT, 0, TAG_SEND_NUM_EDGES, MPI::COMM_WORLD,
MPI_Recv(&num_my_edges, 1, MPI_INT, 0, TAG_SEND_NUM_EDGES, MPI_COMM_WORLD,
NULL);
my_edges = (pair *)calloc(num_my_edges, sizeof(pair));
MPI_Recv(my_edges, num_my_edges, IntPairType, 0, TAG_SEND_EDGES,
MPI::COMM_WORLD, NULL);
MPI_COMM_WORLD, NULL);
}
char *buf = (char *)calloc(sizeof(char), 1000);
@ -155,17 +165,18 @@ int main(int argc, char **argv) {
#pragma endregion
// STEP 2 TIMER STARTS HERE
MPI::COMM_WORLD.Barrier();
double step_2_start_time = MPI::Wtime();
MPI_Barrier(MPI_COMM_WORLD);
double step_2_start_time = MPI_Wtime();
// Each process analyzes the non-local edges that are contained in its portion
// of the graph.
#pragma region
std::map<int, int> node_label_assignment;
std::pair<int, int> my_node_range = node_range(rank);
pair my_node_range =
compute_node_range(p, total_num_nodes, each_num_nodes, rank);
// Initial node assignment
for (int i = my_node_range.first; i < my_node_range.second; ++i) {
for (int i = my_node_range.fst; i < my_node_range.snd; ++i) {
node_label_assignment[i] = i;
}
@ -177,12 +188,12 @@ int main(int argc, char **argv) {
pair edge = my_edges[i];
adj[edge.fst].insert(edge.snd);
if (!(my_node_range.first <= edge.fst && edge.fst < my_node_range.second)) {
if (!(my_node_range.fst <= edge.fst && edge.fst < my_node_range.snd)) {
non_local_nodes.insert(edge.fst);
non_local_edges.insert(std::make_pair(edge.snd, edge.fst));
}
if (!(my_node_range.first <= edge.snd && edge.snd < my_node_range.second)) {
if (!(my_node_range.fst <= edge.snd && edge.snd < my_node_range.snd)) {
non_local_nodes.insert(edge.snd);
non_local_edges.insert(std::make_pair(edge.fst, edge.snd));
}
@ -214,8 +225,8 @@ int main(int argc, char **argv) {
#pragma endregion
// STEP 5 TIMER STARTS HERE
MPI::COMM_WORLD.Barrier();
double step_5_start_time = MPI::Wtime();
MPI_Barrier(MPI_COMM_WORLD);
double step_5_start_time = MPI_Wtime();
// The processes perform the transfers of non-local labels and updates of
// local labels until convergence.
@ -254,13 +265,9 @@ int main(int argc, char **argv) {
}
std::vector<int> recvbuf(recv_total, 0);
// std::cout << fmt::format("[{}] {} \t|| \t{}", rank,
// fmt::join(send_counts, ", "),
// fmt::join(recv_counts, ", "))
// << std::endl;
MPI::COMM_WORLD.Alltoallv(sendbuf.data(), send_counts.data(),
send_displs.data(), MPI_INT, recvbuf.data(),
recv_counts.data(), recv_displs.data(), MPI_INT);
MPI_Alltoallv(sendbuf.data(), send_counts.data(), send_displs.data(),
MPI_INT, recvbuf.data(), recv_counts.data(),
recv_displs.data(), MPI_INT, MPI_COMM_WORLD);
std::map<int, int> total_node_label_assignment(node_label_assignment);
for (int i = 0; i < p; ++i) {
@ -274,7 +281,7 @@ int main(int argc, char **argv) {
// For each local node, determine the minimum label out of its neighbors
std::map<int, int> new_labels;
for (int i = my_node_range.first; i < my_node_range.second; ++i) {
for (int i = my_node_range.fst; i < my_node_range.snd; ++i) {
int current_value = total_node_label_assignment[i];
int min = current_value;
@ -313,8 +320,8 @@ int main(int argc, char **argv) {
#pragma endregion
// END TIMERS
MPI::COMM_WORLD.Barrier();
double end_time = MPI::Wtime();
MPI_Barrier(MPI_COMM_WORLD);
double end_time = MPI_Wtime();
if (rank == 0) {
printf("2-5 Time: %0.04fs\n", end_time - step_2_start_time);
@ -329,19 +336,20 @@ int main(int argc, char **argv) {
std::map<int, int> label_count;
int ctr = 0;
for (int i = 0; i < p; ++i) {
std::pair<int, int> this_node_range = node_range(i);
int count = this_node_range.second - this_node_range.first;
pair this_node_range =
compute_node_range(p, total_num_nodes, each_num_nodes, i);
int count = this_node_range.snd - this_node_range.fst;
if (i == 0) {
for (int j = 0; j < count; ++j) {
all_assignments[this_node_range.first + j] =
node_label_assignment[this_node_range.first + j];
label_count[all_assignments[this_node_range.first + j]]++;
all_assignments[this_node_range.fst + j] =
node_label_assignment[this_node_range.fst + j];
label_count[all_assignments[this_node_range.fst + j]]++;
}
} else {
MPI::COMM_WORLD.Recv(&all_assignments[this_node_range.first], count,
MPI::INT, i, TAG_SEND_FINAL_RESULT);
MPI::COMM_WORLD.Recv(&all_assignments[this_node_range.fst], count,
MPI_INT, i, TAG_SEND_FINAL_RESULT);
for (int j = 0; j < count; ++j) {
label_count[all_assignments[this_node_range.first + j]]++;
label_count[all_assignments[this_node_range.fst + j]]++;
}
}
}
@ -349,15 +357,15 @@ int main(int argc, char **argv) {
std::cout << "Done! " << label_count.size() << std::endl;
} else {
std::vector<int> flat_assignments;
for (int i = my_node_range.first; i < my_node_range.second; ++i) {
for (int i = my_node_range.fst; i < my_node_range.snd; ++i) {
flat_assignments.push_back(node_label_assignment[i]);
}
MPI::COMM_WORLD.Send(flat_assignments.data(), flat_assignments.size(),
MPI::INT, 0, TAG_SEND_FINAL_RESULT);
MPI_INT, 0, TAG_SEND_FINAL_RESULT);
}
#pragma endregion
MPI::Finalize();
MPI_Finalize();
return 0;
}
@ -397,4 +405,11 @@ void pair_vector_push(struct pair_vector *v, int fst, int snd) {
v->ptr[v->len].fst = fst;
v->ptr[v->len].snd = snd;
v->len++;
}
pair compute_node_range(int p, int total_num_nodes, int each_num_nodes,
int process) {
int start = process * each_num_nodes;
int end = process == p - 1 ? total_num_nodes : start + each_num_nodes;
return {.fst = start, .snd = end};
}