Tuning HPEC Linux Clusters for Real-Time Determinism
This paper investigates interrupt response times and message passing latencies using OpenMPI on three different versions of the Linux kernel; one ‘standard’ server grade, one server grade with real-time pre-empt patches applied, and one with a proprietary, real-time kernel. In order to characterize these platforms, a series of measurements were made with and without a background CPU load. This paper will also highlight some system and Linux kernel tuning techniques that can improve determinism and affect system performance. The results are presented in a series of graphs showing histograms of interrupt response and MPI message latencies under the various workloads and tuning scenarios.
Please Log In
The file you are trying to access requires you to be logged in as a registered user. Registration is free, sign up today.