Method GetMemUsage

src/core/memory/memory.cc:30–36

namespace singa {
std::pair<size_t, size_t> CnMemPool::GetMemUsage() {
  size_t free, total;
  auto status = cnmemMemGetInfo(&free, &total, NULL);
  CHECK_EQ(status, cnmemStatus_t::CNMEM_STATUS_SUCCESS)
      << cnmemGetErrorString(status);
  return std::make_pair(free, total);
}
std::pair<size_t, size_t> CnMemPool::GetMemUsage(int id) {
  CHECK_EQ(cudaSetDevice(id), cudaError_t::cudaSuccess);
  size_t free, total;