一个不认识的进程

今天登陆服务器，看到了一个不认识的进程，
root 8581 1 0 Feb14 ? 00:33:01 /usr/bin/python2 -Es /usr/sbin/tuned -l -P

这是个啥，google了一下，好像是跟性能优化有关的进程。

Tuned本质上是一个Linux环境中的后台进程，在运行过程中依据配置内容监控调整系统。监控程序会根据监控的配置内容，监控进程会持续监控结果反馈，调整优化策略。

查看下配置文件

[root@data9 tuned]# cat /etc/tuned/tuned-main.conf

# Global tuned configuration file.

# Whether to use daemon. Without daemon it just applies tuning. It is
# not recommended, because many functions don't work without daemon,
# e.g. there will be no D-Bus, no rollback of settings, no hotplug,
# no dynamic tuning, ...
daemon = 1

# Dynamicaly tune devices, if disabled only static tuning will be used.
dynamic_tuning = 0

# How long to sleep before checking for events (in seconds)
# higher number means lower overhead but longer response time.
sleep_interval = 1

# Update interval for dynamic tunings (in seconds).
# It must be multiply of the sleep_interval.
update_interval = 10

# Recommend functionality, if disabled "recommend" command will be not
# available in CLI, daemon will not parse recommend.conf but will return
# one hardcoded profile (by default "balanced").
recommend_command = 1

# Whether to reapply sysctl from the e.g /etc/sysctl.conf, /etc/sysctl.d, ...
# If enabled these sysctls will be re-appliead after Tuned sysctls are
# applied, i.e. Tuned sysctls will not override system sysctls.
reapply_sysctl = 1

# Default priority assigned to instances
default_instance_priority = 0

# Udev buffer size
udev_buffer_size = 1MB

管理

tuned-adm命令是管理tuned组件的主要接口。
通过list命令，可以查看当前应用和备选的所有Profile内容。

[root@data9 tuned]# tuned-adm list
Available profiles:
- balanced                    - General non-specialized tuned profile
- desktop                     - Optimize for the desktop use-case
- latency-performance         - Optimize for deterministic performance at the cost of increased power consumption
- network-latency             - Optimize for deterministic performance at the cost of increased power consumption, focused on low latency network pe
rformance- network-throughput          - Optimize for streaming network throughput, generally only necessary on older CPUs or 40G+ networks
- powersave                   - Optimize for low power consumption
- throughput-performance      - Broadly applicable tuning that provides excellent performance across a variety of common server workloads
- virtual-guest               - Optimize for running inside a virtual guest
- virtual-host                - Optimize for running KVM guests
Current active profile: balanced

通过tuned-adm命令的profile参数，可以保证系统动态的进行调整参数。

参考

https://www.linuxidc.com/Linux/2015-05/118005.htm
https://access.redhat.com/documentation/zh-cn/red_hat_enterprise_linux/7/html/power_management_guide/tuned