This document outlines a project that tested the performance and power usage of applications running simultaneously on multicore processors. It discusses benchmarking tools like performance counters, PAPI, and the HPC Toolkit. Tests were run on AMD and Intel processors using C-Ray and Ramspeed applications pinned to specific cores. Control tests showed baseline performance for each application alone on each core. Interference tests examined increases in runtime, cache misses, and power when applications shared the processor. Results showed interference effects. Future work could test more applications and cores simultaneously to better understand multicore interference.