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Real-time data collection in Linux: a case study.

¹Department of Psychology, Ohio State University, 142 Townshend Hall, 1885 Neil Ave., Columbus, OH 43210, USA. sf@dactyl.som.ohio-state.edu

Behavior Research Methods, Instruments, & Computers : a Journal of the Psychonomic Society, Inc

|July 13, 2001

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Linux is suitable for real-time data collection and precise programming. This study demonstrates Linux

Area of Science:

Computer Science
Real-time Systems
Operating Systems

Background:

Multiuser UNIX-like operating systems, including Linux, are often deemed unsuitable for real-time data collection due to potential timing latencies from preemptive scheduling.
This perception limits the use of powerful and widely available operating systems in time-sensitive applications.

Purpose of the Study:

To demonstrate the adequacy of Linux for precisely controlled programming with millisecond resolution.
To provide a model for documenting programming methods and software performance on other operating systems.

Main Methods:

Described and tested Linux system calls relevant to timing control.
Developed and evaluated a MIDI-based program for music performance experiments using these system calls.

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Measured the timing accuracy of the application, including data input and output.

Main Results:

Linux system calls provide precise timing control at millisecond resolution or better.
The developed MIDI-based application demonstrated millisecond-level accuracy in timing, data input, and output.
The study validates Linux as a viable platform for real-time experiment software.

Conclusions:

Linux, with appropriate programming techniques, is fully adequate for real-time data collection and precise experimental control.
The methods used for system call testing and application development can serve as a template for other operating systems.
This research challenges the conventional view of Linux's limitations in real-time applications.