61   Linux系统调优基础

Posted 2020-08-28

01 Linux系统调优基础

#显示进行在哪个cpu上运行

[[email protected] ~]# ps axo psr,  

  2 ntpd

  1 qpidd

  3 pickup

  3 sshd

  0 bash

  2 pscomm

  

 #显示进行在哪个cpu上运行，并显示进程的pid 

[[email protected] ~]# ps axo psr,comm,pid

  2 ntpd             3775

  1 qpidd            9998

  3 pickup          26239

  2 sshd            26448

  1 bash            26450

  1 ps              26496

 

 

#绑定进程号为9998的进程到第四颗CPU上

[[email protected] ~]# taskset -p -c 3 9998

pid 9998‘s current affinity list: 0-3

pid 9998‘s new affinity list: 3

#绑定进程号为3775的进程到第一或第二颗CPU上

[[email protected] ~]# taskset -p -c 1,2 3775

pid 3775‘s current affinity list: 0-3

pid 3775‘s new affinity list: 1,2

注意：该命令仅对当前进程有效，重启后无效

#显示中断

[[email protected] ~]# cat /proc/interrupts 

02 Linux系统调优基础

[[email protected] ~]# sar -P ALL 1

[[email protected] ~]# iostat -c 1 

[[email protected] ~]# vmstat 1

03 Linux系统调优基础

#释放缓存

[[email protected] vm]# echo 1 > /proc/sys/vm/drop_caches

[[email protected] ~]# cd /sys/block/sda/

[[email protected] sda]# ls queue/                                                /2\:0\:0\:0/block/sda/

add_random           iostats             minimum_io_size      rotational

discard_granularity  logical_block_size  nomerges             rq_affinity

discard_max_bytes    max_hw_sectors_kb   nr_requests          scheduler

discard_zeroes_data  max_sectors_kb      optimal_io_size      unpriv_sgio

hw_sector_size       max_segments        physical_block_size

iosched              max_segment_size    read_ahead_kb

[[email protected] sda]# ls queue/iosched/

back_seek_max      fifo_expire_sync  low_latency  slice_async_rq

back_seek_penalty  group_idle        quantum      slice_idle

fifo_expire_async  group_isolation   slice_async  slice_sync

#显示磁盘调度算法

[[email protected] sda]# cat queue/scheduler 

noop anticipatory deadline [cfq]

 

#更改磁盘调度算法

[[email protected] sda]# echo deadline > queue/scheduler

[[email protected] sda]# cat queue/scheduler             

noop anticipatory [deadline] cfq 

[[email protected] sda]# ls queue/iosched/

fifo_batch  front_merges  read_expire  write_expire  writes_starved

[[email protected] sda]# echo cfq > queue/scheduler 

[[email protected] sda]# ls queue/iosched/

back_seek_max      fifo_expire_sync  low_latency  slice_async_rq

back_seek_penalty  group_idle        quantum      slice_idle

fifo_expire_async  group_isolation   slice_async  slice_sync

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