【摘要】 <正> 1 引言安腾(Itanium)处理器是HP/Intel公司推出的第一代基于IA-64体系结构的处理器。IA-64体系结构是一种64位的支持显式指令级并行计算(Explicit Parallel Instruction Computing,EPIC)的体系结构,它实现了一系列新特性,支持开发更大的指令级并行性(Instruction Level Parallelism,ILP),突破了传统体系结构的性能限制。这些新特性包括:猜更多还原

【Abstract】 Itanium is the first generation product processor based on IA-64 architecture. ORCCOpen Research Compiler)provides an open source IPF(Itanium Processor Family)research compiler infrastructure. We have compiled and run NAS Benchmarks on the Itanium machine. This paper briefly describes the performance of orcc, sgicc and gcc in the following 3 ways : execution time, compilation time, and executable file size. The results show that orcc has nearly the same performance as sgicc, which is 2 fold faster over gcc in the aspect of execution time. We also find that even with the best-optimized program, the utilization ratio of process resources is no more that 70%.更多还原