World Library  
Flag as Inappropriate
Email this Article

Cray Operating System

Article Id: WHEBN0000855086
Reproduction Date:

Title: Cray Operating System  
Author: World Heritage Encyclopedia
Language: English
Subject: Cray-1, UNICOS, Cos, Chippewa Operating System, Cray X-MP
Collection:
Publisher: World Heritage Encyclopedia
Publication
Date:
 

Cray Operating System

Cray Operating System
Developer Cray Research[1]
Working state Historic
Initial release 1975 (1975)[1]
Latest release 1.17.2 / July 1990 (1990-07)
License Proprietary

The Cray Operating System (COS) succeeded Chippewa Operating System (shipped with earlier computer systems CDC 6000 series and CDC 7600) and was Cray Research's proprietary operating system for its Cray-1 (1976) and Cray X-MP supercomputers, and those platforms' main OS until replaced by UNICOS in the late 1980s. COS was delivered with Cray Assembly Language (CAL), Cray FORTRAN (CFT), and Pascal.

Contents

  • Design 1
    • List of STP tasks 1.1
  • See also 2
  • References 3

Design

As COS was written by ex-SCOPE operating system on the CDC 7600 and before that EXEC*8 from CDC's earlier ERA/Univac pedigree. User jobs were submitted to COS via front-end computers via a high-speed channel interface, and so-called station software. Front end stations were typically large IBM or Control Data mainframes. However the DEC VAX was also a very popular front-end. Interactive use of COS was possible through the stations, but most users simply submitted batch jobs.

Disk-resident datasets used by a user program were 'local' to the individual job. Once a job completed, its local datasets would be released and space reclaimed. In order to retain the data between jobs, datasets had to be explicitly made 'permanent'. Magnetic tape datasets were also supported on Cray systems which were equipped with an I/O Subsystem.

COS also provided job scheduling and checkpoint/restart facilities to manage large workloads, even across system downtimes (both scheduled and unscheduled.)

Internally, COS was divided into a very small message-passing EXEC, and a number of System Task Processors (STP tasks). Each STP task was similar in nature to the peripheral processor programs in earlier Control Data operating systems.

List of STP tasks

STP Task Description
DQM Disk Queue Manager
EXP User Exchange Processor
JCM Job Class Manager
JSH Job Scheduler
PDM Permanent Dataset Manager
SCP Station Control Program
STARTUP Startup
TQM Tape Queue Manager

However since the Cray machines did not have peripheral processors, the main central processor executed the operating system code.

While the source for version 1.13 was released as


  1. ^ a b T-0103C-CRAY_1_Computer_System-Operating_System_COS_Workbook-Training-15th September_1981
  2. ^ https://archive.org/details/Cos1.17DiskImageForCray-1x-mp

References

See also

[2]

This article was sourced from Creative Commons Attribution-ShareAlike License; additional terms may apply. World Heritage Encyclopedia content is assembled from numerous content providers, Open Access Publishing, and in compliance with The Fair Access to Science and Technology Research Act (FASTR), Wikimedia Foundation, Inc., Public Library of Science, The Encyclopedia of Life, Open Book Publishers (OBP), PubMed, U.S. National Library of Medicine, National Center for Biotechnology Information, U.S. National Library of Medicine, National Institutes of Health (NIH), U.S. Department of Health & Human Services, and USA.gov, which sources content from all federal, state, local, tribal, and territorial government publication portals (.gov, .mil, .edu). Funding for USA.gov and content contributors is made possible from the U.S. Congress, E-Government Act of 2002.
 
Crowd sourced content that is contributed to World Heritage Encyclopedia is peer reviewed and edited by our editorial staff to ensure quality scholarly research articles.
 
By using this site, you agree to the Terms of Use and Privacy Policy. World Heritage Encyclopedia™ is a registered trademark of the World Public Library Association, a non-profit organization.
 


Copyright © World Library Foundation. All rights reserved. eBooks from Project Gutenberg are sponsored by the World Library Foundation,
a 501c(4) Member's Support Non-Profit Organization, and is NOT affiliated with any governmental agency or department.