Accession Number : ADA282658

Title :   Performance Measurements of the Multimedia Testbed on Real-Time Mach.

Corporate Author : CARNEGIE-MELLON UNIV PITTSBURGH PA DEPT OF COMPUTER SCIENCE

Personal Author(s) : Dannenberg, Roger B. ; Anderson, David B. ; Neuendorffer, Tom ; Rubine, Dean

Report Date : APR 1994

Pagination or Media Count : 20

Abstract : Multimedia has generated widespread interest in real-time support within general purpose operating systems. Multimedia also places new demands on operating systems for interprocess communication. The Multimedia Testbed is a set of applications that stress consistent low-latency response and efficient interprocess communication for large blocks of data. The Multimedia Testbed was ported to Real-Time Mach in the hopes of providing predictable low-latency response and, consequently, good synchronization and low jitter as required for multimedia applications. Our work compares the performance of Real-Time Mach with that of Mach 3.0. Although the fixed-priority scheduling, of Real-Time Mach is a substantial improvement, user threads are still preempted by device drivers, and the overall real-time performance is not suitable for multimedia applications. We discuss areas where Real-Time Mach needs improvement.

Descriptors :   *REAL TIME, *COMPUTER COMMUNICATIONS, *OPERATING SYSTEMS(COMPUTERS), *TEST BEDS, JITTER, RESPONSE, SCHEDULING, TIME, WORK.

Subject Categories : Computer Programming and Software

Distribution Statement : APPROVED FOR PUBLIC RELEASE