Proceedings of SAT Competition 2022 : Solver and Benchmark Descriptions
https://helda.helsinki.fi/handle/10138/347211
1. Armin Biere Mathias Fleury弗莱堡大学,德国
GIMSATUL, ISASAT, KISSAT GIMSATUL——2022年提交的多线程的求解器,参加parallel组。 ISASAT, KISSAT —— 2022年提交的顺序求解器,参加main组。
笔记: (1-1)内部嵌入式SAT求解器KITTEN来查找从候选变量的环境子句及其邻近子句;用于find backbones and equivalent literals 。 version “KISSAT SC2021 SWEEP” submitted to the SAT Competition 2021——sweeping算法通过替换在扫描期间已经确定等价的字面量和更仔细地调度和重新调度候选变量,特别是在相同的扫描阶段,得到了改进。 (1-2) non-recursive model rotation IMPROVED SWEEPING IN KISSAT is inspired by non-recursive model rotation [2] used in MUS extraction。 新的模型翻转尝试翻转KITTEN返回的最后一个模型中指定文字的值,如果结果的新赋值仍然满足公式,则成功。如果成功,则更新模型。否则,如果翻转使公式证伪,最后一个模型不被触及。 (2-1)2022年提交的“KISSAT SC2022 BULKY”版继承了2021年提交的“KISSAT SC2021 SWEEP版”[1]的大部分功能,但包括以下更改:
(3-1)KISSAT SC2022 LIGHT AND KISSAT SC2022 HYPER 为了把重点放在KISSAT最重要的功能上,我们去掉了那些在最后三个比赛基准中没有显著提高表现的功能:
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2. Watch Sat and LTO for CaDiCaL and KissatNorbert Manthey CADICAL_watch-sat-flto KISSAT_watch-sat-flto
笔记 (1)对编译过程进行了针对性设置与优化; link time optimization (LTO) LTO can be enabled by adding -flto to the compiler invocation. (2)针对minisat和cadical观察体系在传播中的处理过程异同进行了对比叙述。 MINISAT 2.2 2.1 [2] started to use a blocking literal. When propagating a clause, first the truth value of the blocking literal is checked. In case the blocking literal is satisfied, the related clause is known to be satisfied. Therefore, the clause does not have to be processed further. 翻译: MINISAT 2.2 2.1[2]开始使用阻塞字面值。在传播子句时,首先检查阻塞字面值的真值。如果阻塞字面值被满足,则已知相关子句被满足。因此,该子句不需要进一步处理,Always Watching the Satisfied Literal。 One difference between CADICAL and MINISAT 2.2 based solvers is the way how they treat these satisfied clauses. CADICAL skip updating watch lists. Instead, CADICAL implements further extensions, like memorizing the literal in a clause that was tested when last processing the clause [4]. 译文:CADICAL跳过更新监视列表。相反,CADICAL实现了进一步的扩展,比如记住上次处理子句[4]时测试的子句中的文字。 下面这段,基本内容没有搞明白: Just Update the Blocking Literal: As an alternative, Preliminary testing with MERGESAT when just up-dating the blocking literal of a clause resulted in a performance (3)一句很重要的结论式表述: Not processing a satisfied clause during propagation soon again can result in a different order of propagated literals, |
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3. SEQFROST at the SAT Race 2022Sequential Formal ReasOning about SaTisfiability 译文:可满足性的顺序形式推理 SEQFROST is a new solver mostly rewritten from scratch based on our last year submission [1] with efficient data structures and many code optimizations. This year, we observed a large amount of time is spent on function calls in Boolean Constraint Propagation (BCP) and data sorting especially in Multiple-Decision Making (MDM) and inprocessing. 主要技术改进: (1)Thus, we resorted to inlined code and pointer prefetching in BCP and replaced the standard sort procedure with faster modern alternatives, e.g., pdqsort. 我们在BCP中使用内联代码和指针预取,并使用更快的现代替代方法(例如pdqsort)取代标准排序过程。 (2)Further, we augment the Multi-Arm Bandit (MAB) rewarding scheme as implemented in the last year winner KISSAT-MAB to MDM strategy [2], and implement functional dependency extraction to enhance the effectiveness of variable elimination. 译文:此外,我们增强了多臂强盗(MAB)奖励方案将去年获奖者KISSAT-MAB实施到MDM策略[2],并实现功能依赖项提取,提高变量消除的有效性。 (3)Finally, we extend our elimination method eager redundancy elimination (ERE) [1], [3] with clause strengthening to remove redundant literals. 最后,我们扩展了我们的消除方法热切冗余消除(ERE)[1],[3]与子句加强去除冗余字面量。
VARIABLE ELIMINATION
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4. SLIME SAT Solver1st Oscar Riveros (1)给出了一个结论:The DISTANCE heuristic is now parametric, on the experiments, DISTANCE work well with cryptographic instances, but not with generics. (2)提出了HESS black-box algorithm算法--决策变元相位选择的一种策略:
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5. new solvers Cadical ESA and Kissat MAB ESACadical ESA Kissat MAB ESA 分别从 Cadical and Kissat MAB进行的修改。
在变元消除方面进行了改进 variable elimination is essential for modern SAT solvers. In MiniSat [1] and its derived solvers, variable elimination is used in preprocessing(预处理), and in Kissat [2] and other Kissat-based solvers, it is used in inprocessing(制程巡检).
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