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arxiv: 2605.10625 · v1 · submitted 2026-05-11 · 💻 cs.PL

Recognition: no theorem link

Verifying Sequential Consistency under Bounded Preemptions

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Pith reviewed 2026-05-12 05:22 UTC · model grok-4.3

classification 💻 cs.PL
keywords sequential consistencybounded preemptionsNP-hardnessExponential Time Hypothesisprogram verificationinterleavingsconcurrent programscomplexity trichotomy
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The pith

Verification of sequential consistency with bounded preemptions is polynomial-time for single-writer programs and NP-hard for two-writer programs.

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

The paper examines whether a given trace of reads and writes from a multi-threaded program admits a sequentially consistent interleaving that uses at most a fixed number of preemptions. This restricted version of the classic consistency-checking problem appears in software testing and inside dynamic partial-order reduction algorithms. The authors prove a trichotomy in complexity: the check runs in polynomial time when each variable has only a single writer thread, becomes NP-hard as soon as two writers are allowed per variable, and carries a conditional exponential lower bound under the Exponential Time Hypothesis once three writers appear. They additionally show that the problem is W[1]-hard when the preemption bound is treated as the sole parameter.

Core claim

The problem of deciding whether an observed sequence of memory operations is sequentially consistent under an interleaving with at most π preemptions is solvable in polynomial time when the program is single-writer, NP-hard for two-writer programs, and, for three-writer programs, has no 2^{o(π)} algorithm unless the Exponential-Time Hypothesis fails. When π is unbounded the problem is W[1]-hard parameterized by π.

What carries the argument

The trichotomy classification of the bounded-preemption sequential-consistency verification problem according to the number of writers per variable.

If this is right

  • Single-writer programs admit efficient verification even when the number of allowed preemptions is small.
  • Two writers per variable already suffice to make the verification problem NP-hard.
  • Three writers trigger a conditional lower bound showing that no algorithm significantly faster than brute force over preemptions exists.
  • The problem remains hard in the parameterized sense when the preemption limit is the only parameter.

Where Pith is reading between the lines

These are editorial extensions of the paper, not claims the author makes directly.

  • Dynamic partial-order reduction tools can gain efficiency on single-writer code by exploiting the polynomial-time case.
  • Similar complexity thresholds based on writer multiplicity may appear under other memory models.
  • Testing procedures could prioritize or isolate single-writer patterns to scale to larger programs.

Load-bearing premise

The complexity results depend on the precise definition of sequential consistency and the exact way preemptions are counted in an interleaving.

What would settle it

A polynomial-time algorithm for the two-writer case, or a 2^{o(π)} algorithm for the three-writer case that does not violate the Exponential Time Hypothesis.

Figures

Figures reproduced from arXiv: 2605.10625 by B. Srivathsan, R. Govind, Sanchari Sil, S. Krishna.

Figure 1
Figure 1. Figure 1: The partial interleaving (1 : w(x, 1))(3 : r(x, 1))(1 : w(x, 2)) has only one preemption at (1 : w(x, 1)) while the interleaving (1 : w(x, 1))(3 : r(x, 1))(1 : w(x, 2))(2 : r(x, 2))(2 : w(y, 1))(1 : r(y, 1)) has two preemptions at (1 : w(x, 1)) and (1 : w(x, 2)). Classification of programs In our analysis, we classify programs based on the number of threads that write to a variable. A concurrent program is… view at source ↗
Figure 2
Figure 2. Figure 2: Schema for the algorithm for 1-Writer programs 3 Polynomial-time algorithm for 1-Writer programs We begin our analysis with 1-Writer programs, and the main result of this section is to prove the following theorem. Theorem 1. VSCπadmits a polynomial-time solution for 1-Writer programs. For the rest of this section, fix a 1-Writer program Prog with k threads having a total of n events across all threads, and… view at source ↗
Figure 3
Figure 3. Figure 3: In the figure, there are two programs Prog1 and Prog2 . For Prog1 , Step 1 guesses the preemption points to be w(y, 1) from S2, w(x, 2) from S3 and the first r(x, 2) from S4. For Prog2 , the guessed preemption points are w(x, 1) from S1 and w(y, 1) from S2. Step 2.1. A Block-Program from the Blocks. Using these points, the pro￾gram can be divided into blocks as shown in the right of [PITH_FULL_IMAGE:figur… view at source ↗
Figure 3
Figure 3. Figure 3: Programs Prog1 and Prog2 on the left, their corresponding block-programs on the right w.r.t. chosen preemption points. Inner blocks are coloured in violet, and outer blocks in green. The blue edges denote edges in the conflict graph of the outer nodes. a block appear contiguously. Therefore, selecting an interleaving with these pre￾emption points amounts to finding a suitable interleaving of the blocks, wh… view at source ↗
Figure 4
Figure 4. Figure 4: A permutation of inner blocks (above), and an interleaving obtained by [PITH_FULL_IMAGE:figures/full_fig_p008_4.png] view at source ↗
Figure 5
Figure 5. Figure 5: Illustration of the various complexity results [PITH_FULL_IMAGE:figures/full_fig_p010_5.png] view at source ↗
Figure 6
Figure 6. Figure 6: Illustrating the preemption points within a selector thread [PITH_FULL_IMAGE:figures/full_fig_p014_6.png] view at source ↗
read the original abstract

Gibbons and Korach studied a fundamental problem in 1997: given an observed sequence of reads and writes of a multi-threaded program, does there exist an interleaving which is sequentially consistent? Apart from applications in testing shared memory implementations, a procedure for this problem is employed in Dynamic Partial-Order-Reduction (DPOR) algorithms. The problem is known to be NP-hard even when different syntactic parameters are kept bounded. In this paper, we consider a restriction on the kind of interleaving required: does there exist a sequentially-consistent interleaving with at most {\pi} preemptions? Empirical evidence suggests that several bugs manifest within a few preemptive switches. This motivates us to investigate the problem under bounded preemptions. Our results exhibit a trichotomy: the problem lends to a polynomial-time algorithm for the class of single-writer programs where for each variable, there is a single thread writing to it; it becomes NP-hard for two-writer programs and finally, for three-writer programs, we get a conditional lower bound under the Exponential-Time-Hypothesis. When the number of preemptions {\pi} is not bounded, we show the problem to be W[1]-hard, and hence unlikely to be fixed-parameter-tractable with parameter {\pi}.

Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, simulated authors' rebuttal, and a circularity audit. Tearing a paper down is the easy half of reading it; the pith above is the substance, this is the friction.

Referee Report

0 major / 3 minor

Summary. The paper studies the complexity of checking whether an observed trace of reads and writes from a multi-threaded program admits a sequentially consistent interleaving that uses at most π preemptions. Building on the 1997 Gibbons-Korach result, it establishes a trichotomy: the problem is solvable in polynomial time for single-writer programs (one writer per variable), NP-hard for two-writer programs, and admits an ETH-based conditional lower bound for three-writer programs. It additionally proves W[1]-hardness when parameterized by π (unbounded case).

Significance. If the stated reductions and algorithm hold, the work supplies a fine-grained complexity map for a practically motivated restriction of SC verification, directly relevant to DPOR algorithms and concurrency testing. The single-writer polynomial-time case and the clean separation at two versus three writers are the most useful contributions; the ETH lower bound and parameterized hardness further delineate the boundary between tractable and intractable regimes under the standard SC model with explicit preemption counting.

minor comments (3)
  1. The abstract and introduction use the notation {π} (presumably LaTeX artifacts); replace with standard math mode throughout for readability.
  2. Section 3 (or wherever the single-writer algorithm is presented) should include a brief high-level description of the dynamic-programming or graph-search technique before the formal proof, to help readers verify the claimed polynomial bound.
  3. The ETH lower-bound construction for three-writer programs would benefit from an explicit statement of the source problem (e.g., 3-SAT or multicolored clique) and the precise blow-up in the reduction, even if details are in an appendix.

Simulated Author's Rebuttal

0 responses · 0 unresolved

We thank the referee for their positive summary of the paper, accurate capture of the trichotomy results (polynomial-time for single-writer programs, NP-hardness for two-writer programs, and the ETH-based lower bound for three-writer programs), and the recommendation for minor revision. The report correctly identifies the relevance to DPOR and concurrency testing.

Circularity Check

0 steps flagged

No significant circularity in derivation chain

full rationale

The paper establishes complexity-theoretic results (P for single-writer programs, NP-hard for two-writer, ETH lower bound for three-writer, and W[1]-hardness parameterized by π) via explicit reductions from known hard problems and a polynomial-time algorithm for the single-writer case. These steps rely on standard SC semantics and preemption counting as declared inputs; no equation, definition, or self-citation reduces a claimed result to a quantity defined in terms of itself or to a fitted parameter. The 1997 Gibbons-Korach reference is external prior work with no author overlap, and the trichotomy follows directly from the reductions without circular renaming or ansatz smuggling.

Axiom & Free-Parameter Ledger

0 free parameters · 1 axioms · 0 invented entities

The central claims rely on the standard definition of sequential consistency and the Exponential Time Hypothesis; no free parameters or new entities are introduced.

axioms (1)
  • domain assumption Exponential Time Hypothesis (ETH)
    Invoked to obtain the conditional lower bound for three-writer programs.

pith-pipeline@v0.9.0 · 5530 in / 1335 out tokens · 52519 ms · 2026-05-12T05:22:01.889348+00:00 · methodology

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