void start()

in rela/batch_runner.h [46:60]


  void start() {
    if (batchers_.empty()) {
      for (auto& name : methods_) {
        batchers_.emplace(name, std::make_unique<Batcher>(batchsize_));
      }
    } else {
      for (auto& kv : batchers_) {
        kv.second->reset();
      }
    }

    for (auto& kv : batchers_) {
      threads_.emplace_back(&BatchRunner::runnerLoop, this, kv.first);
    }
  }