trace: parallel trace replay with approximate causal events

//TRACE1 is a new approach for extracting and replaying traces of parallel applications to recreate their I/O behav-ior. Its tracing engine automatically discovers inter-node data dependencies and inter-I/O compute times for each node (process) in an application. This information is re-flected in per-node annotated I/O traces. Such annota-tion allows a parallel replayer to closely mimic the be-havior of a traced application across a variety of stor-age systems. When compared to other replay mecha-nisms, //TRACE offers significant gains in replay accu-racy. Overall, the average replay error for the parallel applications evaluated in this paper is below 6%.