Network interface sharing with an experimental gang scheduler on Cenju-3/DE

We have implemented an experimental gang scheduler on Cenju-3/DE[1] in order to investigate efficient scheduling schemes for multiple user environment with high performance communication on parallel machines. The Cenju-3/DE system provides user-level inter-processor communication mechanisms for a single user. It realizes high performance communication, but cannot be shared among multiple users. In order to realize a multiple user environment we have implemented a network interface sharing mechanism, and examined its behavior with the gang scheduling. In this paper, we report our early evaluation of the gang scheduler and highlight some issues we faced. 1 Introduction Recently, high speed communication libraries have become popular on parallel computers such as Cenju-3. Such libraries rely on user-level interprocessor communication mechanism, in which the user program directly accesses the communication hardware for sending messages, and use polling techniques for incoming messages to ..