hardware profiling
RH442
Getting to know your hardware
Hardware profiling
Before tuning the performance, it‘s important to understand the capabilities of your system
CPU 内部寄存器:硬件,时钟周期一致.1级缓存:静态内存,2级缓存:动态高速内存
Memory 相对缓存更慢
Storage 更慢 到磁盘，终止。
Farthe from CPU,slower,bigger,less frequently accessed
Three elements of X86 machine, the ways to use system 针对X86结构
I/O address
IRQ
DMA
CPU profile 指标
grep CPU /proc/cpuinfo
model name : Intel® Xeon® CPU E5-2620 v2 @ 2.10GHz
model name : Intel® Xeon® CPU E5-2620 v2 @ 2.10GHz
Model,Hz 操作系统认为你有两个cpu,Hz是跑步的频率，步子多大无关系 Caches size, L1, L2, L3, private or sharedlscpu
L1d cache:32k L1缓存分为数据缓存
L1i cache:32k &指令缓存
L2 cache:3072K
cpu(s):4 cpu数量为1
Thread(s) per core:1 每颗物理CPU，1为无超线程
Core(s) per socket:2 每颗物理CPU有两个核心
Socket(s):2 两颗物理CPU
CPU features-VT,Architecture 虚拟化,架构64/32是否支持64 cat /proc/cpuinfo |egrep ‘(lm)|(pae)‘
Motherboard chipset 主板芯片组，决定主板和CPU效率 No.of sockets,cores,hyper thereading support Interconnect between sockets 物理CPU多颗时。前端总线联系FSB/qpi/amd 物理CPU之间通讯手段
TOP CPUs
intel E7-8830 8 cores,16 threads 8核，16线程 24M cache, 2.13 GHz,QPI AMD 6284 SE 16 cores 16M cache 2.7GHz
Memory profile 内存
Memory size, max allowed
> free -m
>cat /proc/meminfo
Memory technology,bandwidth and latency 内存第几代技术，以及带宽延时
>DDR2(2 bits),DDR3(4bits),DDR4(8 bits),Rambus(pS/2)
>Latency(wait time before read agin,in ns) 反映速度 纳秒级 列刷新频率
>ECC 内存故障修复 发现内存位失效 纠正 减速 slower safer
Method of memory accessing- UMA NUMA
频率/2=速率 2133/2~~ 1G
UMA or SMP
>MCH 内存控制器 速度瓶颈 pcieX16 显卡占用 卡死了 这是北桥
>ICH 南桥连外设 sata usb pcie*1
NUMA 架构
>两个CPU自己管理自己内存，MCH内置到CPU
>IOH 伪北桥，IO控制器
>ICH 南桥一样
NUMA form apple Mac Pro
>MCH & ICH ->I/O HUB 内设& I/O CONTROLLER 外设..GPU很近
Storage Profile
Type of storage used > Mechanical magnetic platters 盘片 ，磁碟 > SSD devices
Hardware RAID level, no. of disks, striping size
Interconnect type for direct attached storage 内部存储 >SATA SAS IDE IDE没人用了 sata企业级,第三代sata完虐sas sas可靠 SCSI,FIBRE,CHANNEL,ISCSI PCI总线接驳，光纤，互联网 > 带宽，纳秒级，便宜 burstspped vs. average speed 顺序读写 随机读写
SSD
Electronic disk , no moving mechanical components No start-up time Very low latency on read and write Faster than traditional HD sequence 500M/S 200M/S Silent ,not so hot ,vibration free, magnet free,light,less power required Much more expensive,lesser capacity Potentially longer life time MLC 一个单元存多位闪的多寿命短 SLC 很贵，非常贵 每次读至少一个block ####SSD TRIM COMMAND when os erases a file, the file will typically be marked for deletion SSD 不停做垃圾回收 ssd 挂载 fstab default,discard >IDE UP 133MB/S >SATA2 300 >SATA3 600 >SCSI 320 >USB2 60 >USB3 600 >ISCSI GIGA NIC 125 >FIBRE CHANNEL 531 ###PCI EXPRESS >1.0a 2Gb/s bandwidth:2.5GT/s singleLane:250Mb/s full16:8GB/s >2.1 4 5 500 16 >3 8 8 1GB/s 32
Networking profile
Network card model
Network technology
Connection to switch(Speed)
Separated network, special purpose network -Storage,VDI,administration,useradta
I/O virtualization
>cmd
>dmesg
>/var/log/dmesg
>lscpu,lscpu -p
>getconf -a
>x86info
profiling commands
>cmd
>dmidecode
>/sys/class/dmi
>lspci [-v[-v[-v]]]
>lsusb [-v]
>ethtool
>sosreport
>powertop
RH442 1
时间： 2024-10-08 13:53:34