Given the growing disparity between CPU power and the speed of secondary storage, a data cache exploiting large processor storage has the potential to Improve response time dramatically in many situations. The VM/XA SP2 minidisk cache facility, the result of research activity on the characteristics of interactive file-system activity, uses expanded storage to cache input/output to mlnidisks on the Conversational Monitor System. The size of the cache is dynamically ad-Justed by an arbitration process to optimize system performance. Several other functions Improve the performance of the cache during periods of unusual I/O loads.
This paper presents a detailed study of file reference patterns by users of a VM/CMS interactive system. Tlie data were collected from two different IBM locations via CMON, a CMS monitoring facility. We present background information about the CMS file system, the CMON program, and our datareduction programs, as well as a discussion of the results. Some earlier studies of this type have been restricted to a static analysis of the existing flies. However, as Is shown in this paper, a static analysis does not reliably reflect dynamic file reference behavior. By using both static statistics and dynamic statistics, it is possible to better understand how file systems are used, to evaluate possible changes, and to provide distribution parameters for modeling. More recent studies of other Interactive systems have measured dynamic activity patterns. We compare our results with these when appropriate.
The Parallel Processing Compute Server (PPCS) is a distributed-memory multiprocessing system consisting of System/370™ microprocessors (33 at present) interconnected through a matrix switch. This paper describes the hardware configuration, the extensions to the System/370 instruction set that are provided to support the distributed memory and interprocessor signaling, the modifications to the VIUI/SP operating system that allow it to run effectively on many closely coupled processors (most of which have no disks), and the application-support layer, which permits FORTRAN programs to take advantage of the highly parallel environment. Development of the PPCS is a joint effort of the IBIVI Boblingen Development Laboratory and the IBM Thomas J. Watson Research Center. A prototype PPCS has been installed at CERN. IntroductionThe Parallel Processing Compute Server (PPCS) is a distributed-memory multiprocessor that uses message passing for interprocessor communication. It comprises an IBM Enterprise System/9373 (ES/9373) Model 30' [1] 1 The ES/9373 Model 30 is an entry-level processor of the Enterprise System/QSTO™ (ES/9370™), which is a family of mM System/370™ processors that support many users and applications in the commercial, engineering, scientific, and industrial environments. integrated host (I-host) system and 32 (at present) System/370 satellite processors [2], all interconnected via a matrix switch designed to accommodate 62 ports. The I-host is the only processor with I/O capability; otherwise, the satellite processors are functionally identical to the I-host processor. Running under the control of Parallel VM, a modified form of the IBM Virtual Machine/System Product (VM/SP) operating system [3], the PPCS is suitable for a variety of numerically intensive computing programs.Parallel VM features "diskless" operation on the satellite processors (but is designed to exploit I/0-capable satellite processors, if they exist), fast interprocessor communications, local and remote inter-virtual-machine message-passing, and, to a large degree, a single-system image as seen by the application programmer.Distributed VS FORTRAN, a prototype programming environment for PPCS, has been developed. VS FORTRAN [4] application programs must be reorganized by the user to exploit parallel processing by originating, scheduling, and synchronizing subtasks. A subroutine library for task management and data transfer has been developed in the spirit of IBM Parallel FORTRAN [5]. The implementation of this Distributed VS FORTRAN library is based on a CMS [3] extension, called CS/X, that takes advantage of the Parallel VM functions.A PPCS with 32 satellite processors. Parallel VM, and CS/X has been installed at the European Organization for Nuclear Research (CERN) and is running applications used by the high-energy physics (HEP) community. At CERN, ®Copyright 1991 by International Business Machines Corporation. Copying in printed form for private use is permitted without payment of royalty provided that (1) each reproduction is done w...
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