this book constitutes the refereed proceedings of the 9th international workshop on architectures, modeling, and simulation, samos 2009, held on samos, greece, on july 20-23, 2009. the 18 regular papers presented were carefully reviewed and selected from 52 submissions. the papers are organized in topical sections on architectures for multimedia, multi/many cores architectures, vlsi architectures design, architecture modeling and exploration tools. in addition there are 14 papers from three special sessions which were organized on topics of current interest: instruction-set customization, reconfigurable computing and processor architectures, and mastering cell be and gpu execution platforms.