ARM Cortex

The speed of a given CPU depends on many factors, such as the type of instructions being executed, the execution order etc. The MIPS (million instructions per second) value can be useful when comparing performance between processors made with similar architecture, However, MIPS doesn’t make sense when processors are based on different architecture. For this reason, DMIPS / MHz (Dhrystone MIPS) is considered whilst estimating the performance of CPUs, wherein DMIPS result is divided by CPU frequency to enable easy comparison of CPUs running at different clock rates.

DMIPS is a sort of a simple benchmark without I/O tests. The Dhrystone benchmark provides a measure of integer performance (no floating point instructions). The DMIPS/Mhz (Dhrystone MIPS/Megahertz) values are sourced from multiple websites. The DMIPS value for Cortex-A75 and Cortex-A55 are estimated using the performance increase as claimed by ARM. As claimed, “Cortex-A55 delivers significantly higher performance than the Cortex-A53 across the board, including integer (+18%)” and “Cortex-A75 processor provides a significant boost in single-thread performance using a fully out-of-order, variable-length, and symmetrical three-way superscalar pipeline. With over 20% more integer core performance”.