next up previous
Next: Sensitivity of the Model Up: Experimental Results Previous: Quality Experiments

Performance Results

Having clearly established the superior quality of item-based algorithms over the user-based ones, we focus on the scalability challenges. As we discussed earlier, item-based similarity is more static and allows us to precompute the item neighborhood. This precomputation of the model has certain performance benefits. To make the system even more scalable we looked into the sensitivity of the model size and then looked into the impact of model size on the response time and throughput.

Badrul M. Sarwar