总结一下有关于服务器 CPU的结构的一点新知识~
服务器 CPU，顾名思义，就是在服务器上使用的 CPU，它是服务器的「大脑」，也是衡量服务器性能的重要指标。服务器 CPU 按指令系统来分，通常分为 CISC、RISC 和 VLIM 3 类指令系统。
一.CISC架构服务器
从计算机诞生以来，微处理器(CPU)一直采用复杂指令系统(ComplexInstruction Set Computer，CISC)，微型计算机的软件是按照 CISC设计的，并一直沿续到现在。在 CISC 微外理器中，程序的各条指令是按顺序出行执行的，每条指令中的各个操作也是按顺序串行执行的。顺序执行的优点是控制简单，但计算机各部分的利用率不高，执行速度慢。CISC 架构的服务器主要以 IA-32架构(Intel Architecture，英特尔 32 位架构)为主，而且多数为中低档服务器所采用。
二.RISC 架构服务器
CPU 精简指令集(Reduced Instruction Set Computing，RISC)的指令系统相对简单，它只要求硬件执行很有限且最常用的那部分指令，大部分复杂的操作则使用成熟的编译技术，由简单指令合成。目前在中高档服务器中普遍采用这一指令系统的 CPU，特别是高档服务器全都采用 RISC 指令系统的 CPU，在同等频率下，采用RISC 架构的 CPU 比 CISC 架构的 CPU 性能高很多。
三.VLIW架构服务器
超长指令集架构(Very Long Instruction Word，VLIW)采用了先进的 EPIC(清晰并行指令)设计，也将这种构架叫做「IA-64 架构」。每时钟周期例如 IA-64可运行 20 条指令，而 CISC 通常只能运行1~3条指令，RISC能运行4条指令。VLIW 的最大优点是简化了处理器的结构，删除了处理器内部许多复杂的控制电路，也能够使其芯片制造成本降低，价格低廉，能耗少，而且性能也要比超标量芯片高得多。
四.德迅云安全服务器IP
122.228.87.1
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