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NovAtel's novel approach to CPU usage measurement

David R. Crowe

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Abstract

Abstract This paper describes a set of CPU usage analysis tools, named CPU Probes, with the benefits of both hardware and software tools, and few of their disadvantages. CPU probes use a serial line unit or programmable interval timer as a clock to sample the CPU usage of a system, resulting in fast and accurate CPU usage estimates. CPU usage can be monitored for all processes simultaneously or as little as a single machine instruction. CPU probes are well suited for monitoring real‐time system performance. These tools have been implemented on PDP‐11/RSX and UNIX System V/386 systems.

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What this paper is about

Abstract This paper describes a set of CPU usage analysis tools, named CPU Probes, with the benefits of both hardware and software tools, and few of their disadvantages. CPU probes use a serial line unit or programmable interval timer as a clock to sample the CPU usage of a system, resulting in fast and accurate CPU usage estimates. CPU usage can be monitored for all processes simultaneously or as little as a single machine instruction. CPU probes are well suited for monitoring real‐time system performance. These tools have been implemented on PDP‐11/RSX and UNIX System V/386 systems.

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Available abstract

Abstract This paper describes a set of CPU usage analysis tools, named CPU Probes, with the benefits of both hardware and software tools, and few of their disadvantages. CPU probes use a serial line unit or programmable interval timer as a clock to sample the CPU usage of a system, resulting in fast and accurate CPU usage estimates. CPU usage can be monitored for all processes simultaneously or as little as a single machine instruction. CPU probes are well suited for monitoring real‐time system performance. These tools have been implemented on PDP‐11/RSX and UNIX System V/386 systems.

Key concepts: CPU shielding, Central processing unit, Timer, Computer science, Unix, CPU core voltage, Software, Embedded system

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