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Data races make parallel programs hard to understand. Precise race detection that stops an execution on first occurrence of a race addresses this problem, but it comes with significant overhead. In this work, we exploit the insight that precisely detecting only write-after-write (WAW) and read-after-write (RAW) races suffices to provide cleaner semantics for racy programs. We demonstrate that stopping...
We analyze the fundamental performance impact of enforcing a fixed order of synchronization operations to achieve weak deterministic execution. Our analysis is in three parts, performed on a real system using the SPLASH-2 and PAR-SEC benchmarks. First, we quantify the impact of various sources of nondeterminism on execution of data-race-free programs. We find that thread synchronization is the prevalent...
We propose a novel synchronization mechanism called versioning. It dynamically establishes a deterministic order of memory accesses in parallel programs that have serial semantics, in a way that is transparent to the programmer. This order is created in a distributed manner and is enforced by monitoring memory accesses and stalling threads if necessary. Versioning gives rise to parallel programming...
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