cpu性能分析（CPU performance analysis）.docVIP

cpu性能分析（CPU performance analysis） Experience sharing: CPU performance analysis Author: ADM CPU performance analysis , The architecture and working principle of 1:CPU 2: operating systems and processes 3: measures the level of CPUs level of leisure 4:CPU resources become a symptom of the bottleneck of system performance 5: which processes are big to take up CPU resources? 6: uses SAR tools to analyze the utilization of CPU 7: uses the SAR tool to analyze the length of the running process queue 8: uses SAR tools to analyze system calls 9: uses the time command to test the execution efficiency of a command and program 10: uses the top command to look at the process of consuming the most CPU resources 11: uses the uptime command to look at the overall situation of the system 12: uses GlancePlus to analyze system CPU resource utilization 13: performance tuning for CPU demand intensive systems The architecture and working principle of CPU What we call CPU generally refers to the microprocessor, or Microprocessor, and, in general, the main component of a CPU: CPU (central, processing, unit) Cache:cache is a high speed memory whose access time is generally 10-20 microsecond (NS), so that CPU can access a cache in one clock cycle; and general memory access time 80-90 microsecond (NS), which has great influence on the performance of its size to CPU. TLB (translation, lookaside, boffer):TLB is a high-speed cache, which is used to store the virtual addresses and their physical address pairs accessed recently, so that TLB can translate virtual addresses into physical addresses. TLB is a subset of the memory system conversion table; TLB typically points to a memory page rather than a memory address; its size has a major impact on the performance of CPU. Coprocessor Different CPU generally have different clock frequency and cache capacity. CPU can fetch an instruction from the cache and execute it in a single clock cycle. Thus, in theory, the faster the CPU is, the more instructio