Section: New Software and Platforms


Participant : Pierre Michaud.

microarchitecture simulation

TPCalc is a throughput calculator for microarchitecture studies concerned with multi-program workloads consisting of sequential programs. Because microarchitecture simulators are slow, it is difficult to simulate throughput experiments where a multicore executes many jobs that enter and leave the system. The usual practice of measuring instantaneous throughput on independent coschedules chosen more or less randomly is not a rigorous practice because it assumes that all the coschedules are equally important, which is not always true. TPCalc can compute the average throughput of a throughput experiment without actually doing the throughput experiment. The user first defines the workload heterogeneity (number of different job types), the multicore configuration (number of cores and symmetries). TPCalc provides a list of base coschedules. The user then simulates these coschedules, using some benchmarks of his/her choice, and feeds back to TPCalc the measured execution rates (e.g., instructions per cycle or instructions per second).TPCalc eventually outputs the average throughput. Several throughput metrics are available, corresponding to different workload assumptions. These metrics are described in our ACM TACO paper, a collaboration with Ghent University [15] .

TPCalc is an open-source software written in C++. It runs on Unix-based systems (Linux, OS X ...). It is available for download at http://www.irisa.fr/alf/downloads/michaud/tpcalc.html .