442 性能調優 學習第一天

調優的過程當中通常是兩種調優

一種是響應時間的調優

一種是吞吐量調優

兩者之中魚與熊掌不可兼得

調優必備技能 一方面是硬件 另外一方面是軟件，兩者知識結合才能更好的進行調優工做

量化系統指標，並設置一個正常的指標。

分三層調優，業務層調優-》應用層調優-》內核層調優  調優的效果會愈來愈不明顯

應擔優先思考業務是否可以進行調整，後思考應用層的調整，最後最後才考慮內核級別調優

不須要的東西能夠優先關閉

CPU 相關

查看有多少CPU

[root@localhost ~]# cat /proc/cpuinfo

processor: 0

vendor_id: GenuineIntel

cpu family: 15

model : 4

model name: Intel(R) Xeon(TM) CPU 3.00GHz

stepping: 3

cpu MHz : 3000.110

cache size: 2048 KB

physical id: 0

siblings: 2

core id : 0

cpu cores: 1

apicid : 0

initial apicid: 0

fpu : yes

fpu_exception: yes

cpuid level: 5

wp : yes

flags : fpu vme de pse tsc msr pae mce cx8 apic mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall lm constant_tsc pebs bts pni dtes64 monitor ds_cpl cid cx16 xtpr

bogomips: 6000.22

clflush size: 64

cache_alignment: 128

address sizes: 36 bits physical, 48 bits virtual

power management:

#篇幅有限 省略部分

查看緩存

[root@localhost ~]# lscpu

Architecture: x86_64 #CPU架構

CPU op-mode(s): 32-bit, 64-bit

Byte Order: Little Endian

CPU(s): 4 #數量

On-line CPU(s) list: 0-3

Thread(s) per core: 2 #每一個核線程數 若是爲1表明不支持超線程

Core(s) per socket: 1 #一個物理CPU裏面有幾個核

Socket(s): 2

NUMA node(s): 1 #不支持numa的話就顯示爲1

Vendor ID: GenuineIntel

CPU family: 15

Model: 4

Stepping: 3

CPU MHz: 3000.110

BogoMIPS: 5999.18

L1d cache: 16K #一級數據緩存  L1i cache: 16K表明數據指令緩存

L2 cache: 2048K #二級緩存

NUMA node0 CPU(s): 0-3

[root@localhost ~]# lscpu -p

# The following is the parsable format, which can be fed to other

# programs. Each different item in every column has an unique ID

# starting from zero.

# CPU,Core,Socket,Node,,L1d,L2

0,0,0,0,,0,0

1,1,1,0,,1,1

2,0,0,0,,0,0

3,1,1,0,,1,1

物理CPU多顆的時候應該是怎麼聯繫的？

內存

[root@localhost ~]# free -m

            total used free shared buffers cached

Mem: 2887 2197 689 0 227 1097

-/+ buffers/cache: 872 2014

Swap: 4095 81 4014

[root@localhost ~]# cat /proc/meminfo

MemTotal: 2956360 kB

MemFree: 705444 kB

Buffers: 233004 kB

Cached: 1124116 kB

SwapCached: 4676 kB

Active: 1185600 kB

Inactive: 903772 kB

Active(anon): 554292 kB

Inactive(anon): 314724 kB

Active(file): 631308 kB

Inactive(file): 589048 kB

Unevictable: 0 kB

Mlocked: 0 kB

SwapTotal: 4194296 kB

SwapFree: 4110580 kB

Dirty: 180 kB

Writeback: 0 kB

AnonPages: 731272 kB

Mapped: 97284 kB

Shmem: 136764 kB

Slab: 103268 kB

SReclaimable: 74584 kB

SUnreclaim: 28684 kB

KernelStack: 1408 kB

PageTables: 17276 kB

NFS_Unstable: 0 kB

Bounce: 0 kB

WritebackTmp: 0 kB

CommitLimit: 5672476 kB

Committed_AS: 1578500 kB

VmallocTotal: 34359738367 kB

VmallocUsed: 19940 kB

VmallocChunk: 34359706024 kB

HardwareCorrupted: 0 kB

AnonHugePages: 221184 kB

HugePages_Total: 0

HugePages_Free: 0

HugePages_Rsvd: 0

HugePages_Surp: 0

Hugepagesize: 2048 kB

DirectMap4k: 7988 kB

DirectMap2M: 3137536 kB

兩個指標

第幾代技術

延遲

存儲

機械磁盤

SSD (固態

RAID 技術 軟 硬 RAID

接口技術 SATA SAS IDE

dmesg 啓動的全部信息 啓動以後還能夠改變

/var/log/dmesg 啓動的全部信息 啓動完成後不會改變

lscpu

lscpu -p

getconf -a

x86info

dmidecode

lspci 查詢pci信息

ethtool eth0 查詢網卡信息

powertop 查詢最近哪些進程最費電

sosreport 收集計算機信息，紅帽工程師在須要提供幫助的時候會但願你提供這個命令生成的文件信息