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Manufacturing and environmental variations cause timing errors in microelectronic processors that are typically avoided by ultra-conservative multi-corner design margins or corrected by error detection and recovery mechanisms at the circuit-level. In contrast, we present here runtime software support for cost-effective countermeasures against hardware timing failures during system operation. We propose a variability-aware OpenMP (VOMP) programming environment, suitable for tightly-coupled shared memory processor clusters, that relies upon modeling across the hardware/software interface. VOMP is implemented as an extension to the OpenMP v3.0 programming model that covers various parallel constructs, including task, sections, and for. Using the notion of work-unit vulnerability (WUV) proposed here, we capture timing errors caused by circuit-level variability as high-level software knowledge. WUV …