ExecImpl& set_flops_amount(double flop_amount);
ExecImpl& set_host(s4u::Host* host);
s4u::Host* get_host() const { return hosts_.front(); }
ExecImpl& set_flops_amount(double flop_amount);
ExecImpl& set_host(s4u::Host* host);
s4u::Host* get_host() const { return hosts_.front(); }