| // Licensed to the Apache Software Foundation (ASF) under one |
| // or more contributor license agreements. See the NOTICE file |
| // distributed with this work for additional information |
| // regarding copyright ownership. The ASF licenses this file |
| // to you under the Apache License, Version 2.0 (the |
| // "License"); you may not use this file except in compliance |
| // with the License. You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, |
| // software distributed under the License is distributed on an |
| // "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| // KIND, either express or implied. See the License for the |
| // specific language governing permissions and limitations |
| // under the License. |
| |
| #include "runtime/bufferpool/reservation-util.h" |
| |
| #include <algorithm> |
| |
| namespace impala { |
| |
| // Most operators that accumulate memory use reservations, so the majority of memory |
| // should be allocated to buffer reservations, as a heuristic. |
| const double ReservationUtil::RESERVATION_MEM_FRACTION = 0.8; |
| const int64_t ReservationUtil::RESERVATION_MEM_MIN_REMAINING = 32 * 1024 * 1024; |
| |
| int64_t ReservationUtil::GetReservationLimitFromMemLimit(int64_t mem_limit) { |
| int64_t max_reservation = std::min<int64_t>( |
| RESERVATION_MEM_FRACTION * mem_limit, mem_limit - RESERVATION_MEM_MIN_REMAINING); |
| return std::max<int64_t>(0, max_reservation); |
| } |
| |
| int64_t ReservationUtil::GetMinMemLimitFromReservation(int64_t buffer_reservation) { |
| buffer_reservation = std::max<int64_t>(0, buffer_reservation); |
| return std::max<int64_t>( |
| buffer_reservation * (1.0 / ReservationUtil::RESERVATION_MEM_FRACTION), |
| buffer_reservation + ReservationUtil::RESERVATION_MEM_MIN_REMAINING); |
| } |
| } |