DESCR("bookkeeping", "%s", h.on_off(bookkeeping));
DESCR("computation cost factors", "[%s]", comp_cost.to_string().c_str());
DESCR("communication cost factors", "[%s]", comm_cost.to_string().c_str());
DESCR("bookkeeping", "%s", h.on_off(bookkeeping));
DESCR("computation cost factors", "[%s]", comp_cost.to_string().c_str());
DESCR("communication cost factors", "[%s]", comm_cost.to_string().c_str());