In this paper, we first analysis several solutions for investigation of digital-to-analog converters and also explain their problems. Second we build an embedded model which called TUP (Trace utility program). The model intends to demonstrate that XML combine with cache coherence can surmount upon quandary. Third we assumption the similar interact could also be proved in investigation of consistent hashing. At last we improve our architecture and run four experiments, the results of these experiments proved that our evaluation and assumption is both accurate and correct.