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1655 giacomo 1
AUTO - Another Unuseful Track simulatOr
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by Marco Dallera and Marco Fiocca, 2001
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This project was done as a Lab assignment during the course of
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"Informatica Industriale" at the University of Pavia, Italy.
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It simulates a race between cars under a set of 4 tracks.
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The authors provided also some pages that describes the application
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(auto.ps, in italian, on the website).
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To run the application, just compile it and call "x auto th" where tn is
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the track number (0 to 4).
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Since the control algorithm is quite complex, you need a quite powerful
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machine. If you get an exception 8 (WCET violation), you need a faster PC.
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You can anyway run the application making "auto2", that uses RR instead of
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EDF or CBS, or "auto3", that uses the EDFACT Module (you need yo copy
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the edfact.c and edfact.h files in the application directory to do that).
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To be run, the application needs to be compiled with the
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#define MAX_CAB set to a number greater than 20 (see include/modules/cabs.h).
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The control algorithm of the cars is not yet perfect, and if you look to
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the race for a long time, sometimes some cars go in the wrong direction.
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If you find a better algorithm, send me a patch :-)
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The code you can find in this directory is the original code of the
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students except for the MAX_CAB test into main(), and for the idle time
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monitor (that I took from the jumpball example) that can be useful to know
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when the system is overloaded. For example, on my PC there is idle time until
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the system has 9 cars. The tenth make the PC overloaded until one of them
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crashes :-).
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Finally note that the WCET and PERIODS specified by the authors are not so
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correct, and with this setting you can run 8 cars maximum before crashing the
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system.
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Have a nice race...
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Paolo
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pj@sssup.it
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PS: Sometimes on my portable the demo crashes. I wonder why!... If someone
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finds why, please tell me, I will patch it...
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