WengQiang's Blog

where there is a will, there is a way!

最近远程访问家里的电脑,因为家里的电脑会关机或者设置了休眠,远程访问就失败,折腾了一会,发现可以通过wake on lan功能远程开机/唤醒, 以下操作设置是在你已经可以正常远程访问你远程主机的前提下:

打开wake on lan设置

  1. bios 设置(需要bios支持该功能) bios wakeonlan

  2. network adaptor(网卡适配器设置)

技术指标

  1. MA(moving average) 计算方式:某一段时间的收盘价之和/该段时间
    \[MA = \frac{P_1 + P_2 + ... + P_n}{n}\]

  2. WMA(weighted moving average) \[WMA = \frac{1*P_1 + 2*P_2 + ... +(n-1)*P_{n-1}+ n*P_n}{\frac {n*(n+1)}{2}}\]

  3. EMA(exponential moveing average)

  4. RSI(relative strength index) \[RSI = 100 - (\frac{100}{1+RS})\] \[RS = \frac{average\quad of\quad x\quad day's\quad up\quad closes}{average \quad of\quad x\quad day's\quad down\quad closes}\]

缠中说禅

  1. 均线系统
  • 多头模式 vs 空头模式 > 以7日均线以及14日均线为例: 7日均线长期在14日之上为多头, 反之为空头

  • 弱收敛、强收敛、交叉缠绕 > 弱收敛:走势突破短期均线却不能突破长期均线
    > 强收敛:走势突破长期均线然后形成陷阱
    > 交叉:走势突破长期均线,然后反复
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centos 7(64) 系统

  1. 防火墙
  • 查看防火墙是否开启 firewall-cmd --state

  • 重载防火墙,使新规则生效 firewall-cmd --complete-reload

  • 查看打开的端口 firewall-cmd --list-ports

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basic concepts

  • crate: rust package
  • cargo: rust's build system and package manager
  • prelude: pre-import module
    1. at the root of every crate, the compiler injects an implicit extern crate std;
    2. in every module, the compiler injects an implicit use std::prelude::v1::*; (for now)
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rocksdb 读写

rockdb read_write
rockdb read_write
  • wal: write ahead log it can be used to completely recover the data in memtable

    Options::wal_dir: the directory to store wal files Options::wal_ttl: the timeout to delete the wal file

  • memtable: the write cache of rocksdb
  • block cache: the read cache of rocksdb

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