Centos CPU optimization

1 View L1, L2. .. dmesgx86info-c (yuminstallx86info-y) 2 hit rate, loss rate view: valgrind -- tool = caohegrind Command 3 View process priority (usually 0 by default) chrt

1. check L1, L2...

Dmesg x86info-c (yum install x86info-y) 2 hit rate, loss rate view: valgrind -- tool = caohegrind Command 3 View process priority (usually 0 by default) top three priorities of chrt-p 29022 (process number): SCHED_RR 1 ~ 99 adjustment method: chrt-r 50 command SCHED_FIFO 1 ~ 99 adjustment method: chrt-f 50 command SCHED_OTHER 100 ~ 139 (the adjusted value is-20 ~ 19) adjustment method: nice-n-18 command renice-18-p 312 (process number) 4 average load rate view sar-q 1 2 (displayed every second, display twice) top uptime5 usage view mpstat sar-p all 1 2 iostat-c 1 2 more/proc/stat6 clock frequency (unavailable on xen) tick_divider = (in/etc/grub. add the kernel line in conf) 2 (= 500Hz) 4 (= 250Hz) 5 (= 200Hz) 8 (= 125Hz) 10 (= 100Hz) the smaller the tick_divider value, the higher the cpu consumption, the lower the performance, the higher the tick_divider value, the lower the cpu consumption, the higher the performance, and the lower the timer accuracy. 7. cpu frequency voltage/etc/init. d/cpuspeed this process can automatically adjust the cpu frequency and voltage value/etc/sysco Nfig/cpuspeed (the value of cpu frequency and voltage can be manually configured) 8 IRQ balancing this mechanism can allocate processes to different CPUs in a certain way (each 10 seconds by default) if you want to allocate the cpu task process by yourself: chkconfig irqbalance off (disable IRQ balancing) ls/proc/irq (view the current IRQ interrupt) 1 2 10 .... Ls/proc/irq/1/i8042 smp_affinity cat smp_affinity 00000001 (this is the cpu number) echo 00000002>/proc/irq/1/smp_affinity9 assign the process to the cpu taskset-p 0x00001 1 (assign the process with process number 1 to 0x00001cpu) 10 determine which CPUs are running after startup vim/etc/grub. conf isolcpus = 0, 1, 2... 11 view cpu and IRQ cat/proc/cpuinfo cat/proc/interrupt12 close cpu (cannot close cpu at startup) echo 0>/sys/devices/system/cpu/cpu1/online (disable cpu1) echo 1>/sys/devices/system/cpu/cpu1/replaceable/online (enable cpu1) 13. check the resources obtained by the process. cat/proc/3213/status14: group the cpu (default group:/) instance (create/cpusets cpu group) mkdir/cpusets grep cpu/proc/filesystems vim/etc/fstab mount-t cpuset nodev/cpusets/mount-a ls/cpusets /..... cpus ..... mem .... tasks... echo 1>/cpusets/cpus (allocate cpu to/cpusets) echo 0>/cpusets/mems (allocate mem to/cpusets) echo 3132>/cpusets/tasks (process number 3132 is bound to the cpusets group) cat/proc/3132/cpuset/cpusets (default /) (/cpusets/cpu_exclusive cpu in this group can only run in this cpu group) (/cpusets/yy_on_release automatically clears the cpu group cache switch)