Date of Award
Master of Science in Electrical Engineering (MSEE)
After over two decades of extensive research on branch prediction, branch mispredictions are still an important performance and power bottleneck for today’s aggressive processors. All this research has introduced very sophisticated and accurate branch predictor designs, TAGE predictor being the current-state-of-art. In this work, instead of directly improving on individual predictor’s accuracy, I focus on an orthogonal statistical method called bootstrap aggregating, or bagging. Bagging is used to improve overall accuracy by using an ensemble of predictors, which are trained with slightly different data sets. Each predictor (can be same or different predictors) is trained using a resampled (with replacement) training set (bootstrapping). Then, the final prediction is simply provided by weighting or majority voting (aggregating). This work shows that applying bagging improves performance more than simply increasing the size of the predictor.
Karsli, Ibraham Burak, "BOOTSTRAP AGGREGATING BRANCH PREDICTORS" (2014). Open Access Master's Theses. Paper 447.