What is the server CPU

At present, the server CPU is still divided according to the CPU instruction system, usually divided into CISC type CPU and RISC type CPU. Later, a 64-bit VLIM (Very Long Instruction Word super) appeared. Long instruction set architecture) The CPU of the instruction set.

a, CISC type CPU

CISC English & ldquo; Complex Instruction Set Computer & rdquo; abbreviation, Chinese meaning & ldquo; & rdquo ;, a complex instruction set of Intel it refers to production X86 (a naming convention for intel CPUs) series CPUs and their compatible CPUs (other manufacturers such as AMD, VIA, etc.) are based on PC (PC) architecture. This kind of CPU is generally a 32-bit structure, so we also make it an IA-32 CPU. (IA: Intel Architecture, Intel Architecture). The CISC type CPU currently mainly has two types: intel server CPU and AMD server CPU.

Second, RISC type CPU

RISC is the abbreviation of English "Reduced Instruction Set Computing", meaning "simplified instruction set" in Chinese. It is developed on the basis of the CISC (Complex Instruction Set Computer) instruction system. Some people have tested the CISC machine and showed that the frequency of use of various instructions is quite different. The most commonly used are some relatively simple instructions, they only account for 20% of the total number of instructions, but 80% of the frequency of the program. Complex instruction systems inevitably increase the complexity of the microprocessor, making the processor development time long and costly. And complex instructions require complex operations, which inevitably slow down the computer.

Based on the above reasons, the RISC type CPU was born in the 1980s. Compared with the CISC type CPU, the RISC type CPU not only streamlined the command system, but also adopted a kind of superscalar and super-pipeline structure. ;, greatly increased the parallel processing capability (parallel processing parallel processing refers to a server with multiple CPUs simultaneously processing. Parallel processing can greatly improve the server's data processing capabilities. Departmental, enterprise-level servers should support CPU parallel processing technology) . That is to say, under the same frequency, the CPU with RISC architecture has much higher CPU performance than the CISC architecture, which is determined by the technical characteristics of the CPU. At present, CPUs of this command system are widely used in medium and high-end servers, and in particular, high-end servers all use the CPU of the RISC command system. The RISC command system is more suitable for the high-end server operating system UNIX, and now Linux is also a UNIX-like operating system. RISC-type CPUs are not compatible with Intel and AMD CPUs in software and hardware.

At present, the CPUs that use RISC instructions in medium and high-end servers mainly have the following types:

(1) PowerPC processors

(2) SPARC processors

(3) PA-RISC processor

(4) MIPS processor

(5) Alpha processor