tangnotes

root@devpc01:/home/linhua# cpupower frequency-info
analyzing CPU 0:
  driver: intel_cpufreq
  CPUs which run at the same hardware frequency: 0
  CPUs which need to have their frequency coordinated by software: 0
  maximum transition latency: 20.0 us
  hardware limits: 800 MHz - 3.40 GHz
  available cpufreq governors: conservative ondemand userspace powersave performance schedutil
  current policy: frequency should be within 800 MHz and 3.40 GHz.
                  The governor "ondemand" may decide which speed to use

tangnotes

[Sun Feb 20 14:50:58 2022] rcu: INFO: rcu_sched self-detected stall on CPU
[Sun Feb 20 14:50:58 2022] rcu:         0-...!: (1 GPs behind) idle=ab6/1/0x4000000000000002 softirq=71528/71530 fqs=0
[Sun Feb 20 14:50:58 2022]      (t=403679 jiffies g=325261 q=466)
[Sun Feb 20 14:50:58 2022] rcu: rcu_sched kthread starved for 403679 jiffies! g325261 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1
[Sun Feb 20 14:50:58 2022] rcu:         Unless rcu_sched kthread gets sufficient CPU time, OOM is now expected behavior.
[Sun Feb 20 14:50:58 2022] rcu: RCU grace-period kthread stack dump:
[Sun Feb 20 14:50:58 2022] task:rcu_sched       state:I stack:    0 pid:   12 ppid:     2 flags:0x80004000
[Sun Feb 20 14:50:58 2022] Call Trace:
[Sun Feb 20 14:50:58 2022]  __schedule+0x2d1/0x830
[Sun Feb 20 14:50:58 2022]  schedule+0x35/0xa0

tangnotes

See https://staaldraad.github.io/2017/12/20/netstat-without-netstat/

awk 'function hextodec(str,ret,n,i,k,c){
    ret = 0
    n = length(str)
    for (i = 1; i <= n; i++) {
        c = tolower(substr(str, i, 1))
        k = index("123456789abcdef", c)
 ret = ret * 16 + k

tangnotes

function getPPID() {
        _pid0=$1
        _pid=`ps --no-header -o pid -p $_pid0`
        if [ "x$_pid" == "x" ]
        then
                echo "Error: $_pid0 does not exists"
                return
        fi
        echo -n "$_pid > "

tangnotes

import redis
import random
import string
import threading

host_ip='192.168.0.100'
host_port=6379
target_size = 1024 * 1024 # KB

def get_random_string(length):

tangnotes

#!/bin/bash

file=$1

if [ "x$file" == "x" ]
then
    echo "Usage: $0 FILE_NAME"
    exit 1
fi

tangnotes

[Unit]
Description=The NGINX HTTP and reverse proxy server
After=syslog.target network.target remote-fs.target nss-lookup.target

[Service]
Type=forking
PIDFile=/usr/local/nginx/logs/nginx.pid
ExecStartPre=/usr/local/nginx/sbin/nginx -t
ExecStart=/usr/local/nginx/sbin/nginx
ExecReload=/usr/local/nginx/sbin/nginx -s reload

tangnotes

{
  "Ansi 6 Color" : {
    "Green Component" : "0.5960785",
    "Blue Component" : "0.6039215999999999",
    "Red Component" : "0.02352941"
  },
  "Tags" : [

  ],
  "Ansi 12 Color" : {

tangnotes

export TANGO_ENV=personal_laptop
export PS1="[\033[32m\d \t\033[0m] \h: \033[36m\w\033[0m $\n> "
export CLICOLOR=1
export LSCOLORS=GxFxCxDxBxegedabagaced
export PATH=/usr/local/bin:$PATH

tangnotes

    server {
        listen 80;
        server_name upstream.test.uve.io;
        default_type 'application/json';
        location / {
            content_by_lua_block {
                 ngx.say('{"data":[{"uid":"123456","name":"James"}],"__tmeta":{"mkey1":"mval1","mkey2":"mval2"}}')
             }
        }
    }