Livermore Timesharing Network surveillance system
The Livermore Timesharing Network surveillance system is described. The system monitors a network of four CDC 7600 and two CDC Star-100 computers, which are connected by a DEC PDP-10, several PDP-8 and PDP-11 teletype message concentrators, and other devices. It simulates some common daily programing functions that a typical human network user would perform, and then measures the actual ''wall clock'' time required for a particular computer on the network to respond to these tasks. This data can be used to calculate a performance index, or figure of merit, for each network node. The system employs a PDP-11/10 processor with disk cartridge and 24K of core memory. It includes a custom-structured disk operating system supported by several semi-intelligent processes. Such a design was dictated by hardware and software constraints, as well as by the desire to have an active, continuous measure of network availability. This approach keeps measurement overhead time to a minimum. The system also chooses the fastest algorithm to identify and respond to network messages correctly, synchronizes its minicomputer program response with message rates, and recognizes the correct sequence of messages for timing ''marks.''
- Research Organization:
- California Univ., Livermore (USA). Lawrence Livermore Lab.
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 6503071
- Report Number(s):
- UCRL-81602; CONF-790110-1
- Country of Publication:
- United States
- Language:
- English
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