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Jim Grindle
This paper goes over the current (June, 1998) status of UNICOS/mk and the Cray T3E. It covers the recent hardware improvements, the UNICOS/mk software roadmap, including support plans and releases; and a number of software status issues including Software Problem Report(SPR) status, Mean Time To Interrupt(MTTI) numbers, and software feature status.?
Patti Langer
This talk will cover current release and support plans, reliability/stability efforts, future plans as well as T90P and J90++ updates.
Kostadis Roussos
Miser is a dynamic batch process scheduler that provides deterministic batch scheduling and increased system throughput without static partitioning of a system. Static partitioning allows resources to be targeted at specific classes of processes, thus allowing deterministic run times, but can lead to waste. Miser gives submitted batch jobs processing priority over the required resources needed to complete on schedule, but reduces waste by allowing idle resources to be used. The batch scheduler consists of a user process which schedules job resources, and kernel support for delivering resources to jobs on schedule. The combination allows flexibility while improving responsiveness and performance.
Barry Sharp
During the past eight years of running UNICOS on X-MP, Y-MP, and T90 systems numerous enhancements to the kernel, System Administration and User-Level facilities have been made. This paper outlines the rationale for these and provides descriptions on their implementation. The intent is to share this inventory with other UNICOS member sites and to suggest those that might be applicable to the Origin2000 IRIX system.
Barry Sharp
The UNICOS system is designed with both batch and interactive workload requirements in mind. However, in practice, the vanilla UNICOS kernel memory scheduler struggles to adequately balance these two distinct workloads, even with its wealth of scheduler tuning parameters. This paper presents a simple modification to the kernel-level memory scheduler that works harmoniously with the vanilla system to simplify the process of balancing the two workloads.
Manfred Stolle
- DMF on UNICOS, UNICOS/MK and IRIX is well suited to handle a local file system but it gets rather poor in a distributed environment with files larger than the DMF controlled file system. Using a small DMF controlled file system a `file system full` error is not supposed to occur due to poor migration performance or too large external files. dmscp-agent is a tool supporting the transfer of data streams to/from a file server with DMF related features.
- A DMF controlled file system with a long history shows problems concerning the fast and safe restoration of data located on damaged tapes.dmtaperepair is a tool usable to efficiently restore bitfiles of a damaged tape in the same MSP.
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