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| 1 | //===-- Utils/ExponentialBackoff.h - Heuristic helper class ------*- C++ -*===// |
|---|---|
| 2 | // |
| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| 4 | // See https://llvm.org/LICENSE.txt for license information. |
| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| 6 | // |
| 7 | //===----------------------------------------------------------------------===// |
| 8 | // |
| 9 | // Implement exponential backoff counting. |
| 10 | // Linearly increments until given maximum, exponentially decrements based on |
| 11 | // given backoff factor. |
| 12 | // |
| 13 | //===----------------------------------------------------------------------===// |
| 14 | |
| 15 | #ifndef OMPTARGET_UTILS_EXPONENTIAL_BACKOFF_H |
| 16 | #define OMPTARGET_UTILS_EXPONENTIAL_BACKOFF_H |
| 17 | |
| 18 | #include <cassert> |
| 19 | #include <cmath> |
| 20 | #include <cstdint> |
| 21 | |
| 22 | namespace utils { |
| 23 | |
| 24 | class ExponentialBackoff { |
| 25 | int64_t Count = 0; |
| 26 | const int64_t MaxCount = 0; |
| 27 | const int64_t CountThreshold = 0; |
| 28 | const double BackoffFactor = 0; |
| 29 | |
| 30 | public: |
| 31 | ExponentialBackoff(int64_t MaxCount, int64_t CountThreshold, |
| 32 | double BackoffFactor) |
| 33 | : MaxCount(MaxCount), CountThreshold(CountThreshold), |
| 34 | BackoffFactor(BackoffFactor) { |
| 35 | assert(MaxCount >= 0 && |
| 36 | "ExponentialBackoff: maximum count value should be non-negative"); |
| 37 | assert(CountThreshold >= 0 && |
| 38 | "ExponentialBackoff: count threshold value should be non-negative"); |
| 39 | assert(BackoffFactor >= 0 && BackoffFactor < 1 && |
| 40 | "ExponentialBackoff: backoff factor should be in [0, 1) interval"); |
| 41 | } |
| 42 | |
| 43 | void increment() { Count = std::min(Count + 1, MaxCount); } |
| 44 | |
| 45 | void decrement() { Count *= BackoffFactor; } |
| 46 | |
| 47 | bool isAboveThreshold() const { return Count > CountThreshold; } |
| 48 | }; |
| 49 | |
| 50 | } // namespace utils |
| 51 | |
| 52 | #endif // OMPTARGET_UTILS_EXPONENTIAL_BACKOFF_H |
| 53 |
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