Linux性能优化实战：系统的swap变高（09）

Posted 2021-02-10 python运维自动化之路

tags:

篇首语：本文由小常识网(cha138.com)小编为大家整理，主要介绍了Linux性能优化实战：系统的swap变高（09）相关的知识，希望对你有一定的参考价值。

一、实验环境

1、操作系统

root@openstack:~# lsb_release -a
No LSB modules are available.
Distributor ID:	Ubuntu
Description:	Ubuntu 18.04.1 LTS
Release:	18.04
Codename:	bionic

2、内存

root@openstack:~# free -h
total used free shared buff/cache available
Mem: 4.9G 114M 4.0G 992K 773M 4.5G
Swap: 3.9G 0B 3.9G

3、cpu

root@openstack:~# lscpu
Architecture: x86_64
CPU op-mode(s): 32-bit, 64-bit
Byte Order: Little Endian
CPU(s): 2
On-line CPU(s) list: 0,1
Thread(s) per core: 1
Core(s) per socket: 2
Socket(s): 1
NUMA node(s): 1
Vendor ID: GenuineIntel
CPU family: 6
Model: 60
Model name: Intel(R) Core(TM) i3-4150 CPU @ 3.50GHz
Stepping: 3
CPU MHz: 3491.930
BogoMIPS: 6983.86
Hypervisor vendor: KVM
Virtualization type: full
L1d cache: 32K
L1i cache: 32K
L2 cache: 256K
L3 cache: 3072K
NUMA node0 CPU(s): 0,1

二、上传文件实验

1、窗口1

2、窗口2

# 间隔 1 秒输出一组数据
# -r 表示显示内存使用情况，-S 表示显示 Swap 使用情况
# sar -r -S 1

root@openstack:~# sar -r -S 1
Linux 4.15.0-45-generic (openstack) 	02/06/2019 	_x86_64_	(2 CPU)

09:32:07 AM kbmemfree   kbavail kbmemused  %memused kbbuffers  kbcached  kbcommit   %commit  kbactive   kbinact   kbdirty
08:32:08 AM   4189512   4744524    906804     17.79     50276    695116    257800      2.82    527428    258832         0

09:32:07 AM kbswpfree kbswpused  %swpused  kbswpcad   %swpcad
09:32:08 AM   4039676         0      0.00         0      0.00

09:46:08 AM kbmemfree   kbavail kbmemused  %memused kbbuffers  kbcached  kbcommit   %commit  kbactive   kbinact   kbdirty
09:46:09 AM    112780   4660228   4983536     97.79     52088   4630296    284412      3.11    572084   4178412    192368

09:46:08 AM kbswpfree kbswpused  %swpused  kbswpcad   %swpcad
09:46:09 AM   4039676         0      0.00         0      0.00

上升截图