memory leak

[Co1lin]

Graph deconstruction will not release occupied memory.

test code:

#include <iostream>
#include <vector>

#include "quartz/tasograph/tasograph.h"
#include "quartz/context/context.h"
using namespace quartz;

const std::string input_file = "../experiment/nam_circs/adder_8.qasm";

Context ctx({
        GateType::h, GateType::cx, GateType::x, GateType::rz, GateType::add,
        GateType::input_qubit, GateType::input_param
});
QASMParser qasm_parser(&ctx);

template<class Vec, class VT>
void append(Vec& vec, const VT& value) {
  vec.emplace_back(value);
}

auto graph_from_qasm_file(const std::string& file) {
  DAG *dag = nullptr;
  qasm_parser.load_qasm(file, dag);
  return std::make_shared<Graph>( Graph(&ctx, dag) );
}

int main()
{
  std::vector<std::shared_ptr<Graph>> buffer;
  std::cout << "Reading graph...  " << std::endl;
  const auto test_graph = Graph::from_qasm_file(&ctx, input_file);
//  const auto test_graph = graph_from_qasm_file(input_file);
  std::cout << "test_graph.get_num_qubits() = " << test_graph->gate_count() << std::endl;
  while (true) {
    int delta = 0;
    std::cin >> delta;
    if (delta >= 0) {
      std::cout << "Start appending: size(buffer) = " << buffer.size() << " delta = " << delta << std::endl;
      for (int i = 0; i < delta; i++) {
        auto tmp_graph = Graph::from_qasm_file(&ctx, input_file);
        append(buffer, tmp_graph);
      }
      std::cout << "Appending finished: size(buffer) = " << buffer.size() << "\n\n";
    }
    else {
      std::cout << "\nStart popping: size(buffer) = " << buffer.size() << " delta = " << delta << std::endl;
      for (int i = delta; i < 0; i++) {
        buffer.pop_back();
      }
      std::cout << "Popping finished: size(buffer) = " << buffer.size() << "\n\n";
    }
  }

  return 0;
}

ps afu | awk 'NR>1 {$5=int($5/1024)"M";}{ print;}' | grep test_mem