Implementation of Multicore communications API

This paper presents an implementation of Multicore Communications API (MCAPI), with focus on portability, stability, and simplicity of the design. The main motivation for the implementation is instability of other publicly available implementations. The developed implementation utilizes POSIX message queues, that is an easily portable interface and readily compatible with MCAPI. The performance was measured as latency and transfer rate of the API. The measurement platforms were a x86-64 PC and a development board featuring an ARM processor. A MCAPI implementation was used as reference for comparison. PMQ-MCAPI is much more stable and easily usable than other MCAPI implementations publicly available for PC. When transfer size was between 1-8 KiB, latency of transfers between cores was between 9-15 μs and transfer rate 500-5000 MBps. This translates to 27 000-45 000 cycles and 0.16-1.67 bytes per cycle. CPU and especially performance of its cache were concluded as the most important factors contributing to the performance. In comparison to the reference, latency of the implementation was 1/8 at best, while transfer rate was up to 35x.