Measure of Data Accuracy Consistent with Travel Time Information Accuracy
The accuracy of travel time information provided to the traveler is an important factor affecting the benefit ofadvanced traveler information systems ( ATIS). A recent work shows that the ATIS travel time error should be lower than 20% in order that the average user of the service gets the benefit of improving on-time reliability.
An instruction-level simulator for IBM 3090 with VF (vector facility) has been developed for studying the performance of vector processors and their memory hierarchies. Results of a study of the locality of several large scientific applications are presented. The cache miss ratios of vectorized applications are found to be almost equal to those of their original scalar executions. Moreover, both the spatial and temporal locality of these applications (in scalar and vector executions) are strong enough to show a sufficiently high hit ratio on conventional cache structures.<<ETX>>