ExecImpl* start(double flops_amount, double priority, double bound);
ExecImpl* start(const std::vector<s4u::Host*>& hosts, const std::vector<double>& flops_amounts,
const std::vector<double>& bytes_amounts);
ExecImpl* start(double flops_amount, double priority, double bound);
ExecImpl* start(const std::vector<s4u::Host*>& hosts, const std::vector<double>& flops_amounts,
const std::vector<double>& bytes_amounts);