Abstract
To support performance measurement and analysis of GPU-accelerated applications, we extended the HPCToolkit performance tools with several novel features. To support efficient monitoring of accelerated applications, HPCToolkit employs a new wait-free data structure to coordinate measurement and attribution between each application thread and a GPU monitor thread. To help developers understand the performance of accelerated applications, HPCToolkit attributes metrics to heterogeneous calling contexts that span both CPUs and GPUs. To support fine-grain analysis and tuning of GPU-accelerated code, HPCToolkit collects PC samples of both CPU and GPU activity to derive and attribute metrics at all levels in a heterogeneous calling context.
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