81 lines
3.1 KiB
Markdown
81 lines
3.1 KiB
Markdown
# stalld
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#### 介绍
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The stalld program (which stands for 'stall daemon') is a
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mechanism to prevent the starvation of operating system threads in a
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Linux system. The premise is to start up on a housekeeping cpu (one
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that is not used for real-application purposes) and to periodically
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monitor the state of each thread in the system, looking for a thread
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that has been on a run queue (i.e. ready to run) for a specifed length
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of time without being run. This condition is usually hit when the
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thread is on the same cpu as a high-priority cpu-intensive task and
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therefore is being given no opportunity to run.
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When a thread is judged to be starving, stalld changes
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that thread to use the SCHED_DEADLINE policy and gives the thread a
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small slice of time for that cpu (specified on the command line). The
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thread then runs and when that timeslice is used, the thread is then
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returned to its original scheduling policy and stalld then
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continues to monitor thread states.
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There is now an experimental option to boost using SCHED_FIFO. This
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logic is used if the running kernel does not support the
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SCHED_DEADLINE policy and may be forced by using the -F/--force_fifo
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option.
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#### 安装教程
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Install stalld rpm package:
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yum install stalld
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#### 使用说明
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Logging options
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-l/--log_only: only log information (do not boost) [false]
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-v/--verbose: print info to the std output [false]
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-k/--log_kmsg: print log to the kernel buffer [false]
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-s/--log_syslog: print log to syslog [true]
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Startup options
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-c/--cpu: list of cpus to monitor for stalled threads [all cpus]
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-f/--foreground: run in foreground [false but true when -v]
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-P/--pidfile: write daemon pid to specified file [no pidfile]
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Boosting options
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-p/--boost_period: SCHED_DEADLINE period [ns] that the starving task will receive [1000000000]
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-r/--boost_runtime: SCHED_DEADLINE runtime [ns] that the starving task will receive [20000]
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-d/--boost_duration: how long [s] the starving task will run with SCHED_DEADLINE [3]
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-F/--force_fifo: force using SCHED_FIFO for boosting
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Monitoring options
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-t/--starving_threshold: how long [s] the starving task will wait before being boosted [60]
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-A/--aggressive_mode: dispatch one thread per run queue, even when there is no starving
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threads on all CPU (uses more CPU/power). [false]
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#### 参与贡献
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master分支使用最新的上游版本，如果检测到上游有最新版本发布，先形成issue后再提交对应PR更新，流程如下。
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1. 提交issue
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2. Fork 本仓库
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3. 新建 Feat_xxx 分支
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4. 提交代码
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5. 新建 Pull Request
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#### 特技
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1. 使用 Readme\_XXX.md 来支持不同的语言，例如 Readme\_en.md, Readme\_zh.md
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2. Gitee 官方博客 [blog.gitee.com](https://blog.gitee.com)
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3. 你可以 [https://gitee.com/explore](https://gitee.com/explore) 这个地址来了解 Gitee 上的优秀开源项目
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4. [GVP](https://gitee.com/gvp) 全称是 Gitee 最有价值开源项目，是综合评定出的优秀开源项目
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5. Gitee 官方提供的使用手册 [https://gitee.com/help](https://gitee.com/help)
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6. Gitee 封面人物是一档用来展示 Gitee 会员风采的栏目 [https://gitee.com/gitee-stars/](https://gitee.com/gitee-stars/)
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