事件驱动服务器, event-driven server https://gist.github.com/jcouyang/9914091 OPPC模型瓶颈 传统服务器模型如Apache为每一个请求生成一个子进程。当用户连接到服务器的一个子进程就产生,并处理连

TPS、QPS、RPS PPS PPS (Packet Per Second) PCT (percentile) PCT99: 99%的响应时间 “90th pct/95th pct/99th pct”分别表示测试实例按响应时间从小到大排序后,第90/95/99个测

java spi, ServiceLoader ServiceLoader与ClassLoader是Java中2个即相互区别又相互联系的加载器.JVM利用ClassLoader将类载

spring rabbitmq https://spring.io/guides/gs/messaging-rabbitmq/

raspberry ntp http://raspberrypi.tomasgreno.cz/ntp-client-and-server.html

linux enca 编码并转换 enca -list languages enca -L zh_CN file 检查文件的编码 enca -L zh_CN -x UTF-8 file 将文件编码转换为"UTF-8″编码 enca -L zh_CN -x UTF-8 < file1 > file2 如果不想覆盖原文件可以这

Mahonia Mahonia—a character-set conversion library for Go Mahonia is a character-set conversion library implemented in Go. All data is compiled into the executable; it doesn’t need any external data files. Mahonia is now deprecated. I recommend using the standard package at golang.org/x/text/encoding, possibly along with golang.org/x/net/charset https://code.google.com/archive/p/mahonia/

golang 各种数据类型转换 Conversions are expressions of the form T(x) where T is a type and x is an expression that can be converted to type T. string > duration 1 2 d, e := time.ParseDuration("-1h") d, e := time.ParseDuration("1000ms") array > slice 1 2 arr := [3]int{1,2,3} sli := arr[:] hex > int, big.Int 1 2 3 4 5 6 // int n,

go file 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 if srcFile, err = os.Open(localPath); err != nil { logger.Errorf("failed to read src file: %v", err) return } defer srcFile.Close() fileInfo, err := srcFile.Stat() fileSize := fileInfo.Size() // file size os.PathSeparator file, _ := os.Getwd() log.Println("current path:", file) file, _ = exec.LookPath(os.Args[0]) log.Println("exec path:",

openssl basic 查看私钥长度 1 openssl rsa -in id_rsa.pem -text -noout get cert 1 openssl s_client -connect site.com:636 </dev/null 2>/dev/null | openssl x509 -outform PEM > site.pem import cert into ca certs 1 sudo keytool -importcert -noprompt -alias site-`date "+%Y%m%d%H%M%S"` -file ./site.pem -keystore /usr/java/latest/lib/security/cacerts -storepass changeit 查看证书信息 pem 1 2 openssl x509 -noout -text -in ca.crt openssl x509 -noout -text -in

emacs elpa https://elpa.emacs-china.org/index-en.html 1 2 3 4 5 emacs ~/.emacs (setq package-archives '(("gnu" . "http://elpa.emacs-china.org/gnu/") ("melpa" . "http://elpa.emacs-china.org/melpa/"))) M-x list-packages Type M-x list-packages to open the package list. Press ‘i’ to mark for installation, ‘u’ to unmark, and ‘x’ to perform the installation. Press ‘RET’ to read more about installing and using each package. https://www.emacswiki.org/emacs/InstallingPackages

nginx basic, command 1 2 3 4 5 6 7 8 9 # Do not run, just test the configuration file. sudo nginx -t nginx -s signal # stop — fast shutdown # quit — graceful shutdown # reload — reloading the configuration file # reopen — reopening the log files almalinux install nginx 1 2 3 sudo dnf update -y sudo dnf install nginx -y sudo systemctl enable --now

正向代理, Forward Proxy, 反向代理, reverse proxy 正向代理是代理客户端, 为客户端收发请求, 使真实客户端对服务器不可见； 而反向代理是代理服务器端, 为服务器收发请求,

linux cut 1 2 3 4 cut -d ',' -f 3 # 截取前24个字符 cut -c-24 http://www.cnblogs.com/dong008259/archive/2011/12/09/2282679.html cut是一个选取命令,就是将一段数据经过分析,取出我们想要的。一般来说,选取信息通常是针对&q

Guava Multimap 在日常的开发工作中,我们有的时候需要构造像Map<K, List>或者Map<K, Set>这样比较复杂的集合类型的

ConcurrentModificationException 对Vector、ArrayList在迭代的时候如果同时对其进行修改就会抛出java.util.ConcurrentModification

AUTOCONF, AUTOMAKE, configure, make, make install http://blog.csdn.net/linzhiji/article/details/6774410 这些都是典型的使用GNU的AUTOCONF和AUTOMAKE产生的程序的安装步骤。 ./configure是用来检测你的安装平台

dnscrypt Server 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68

swap archlinux 禁用 swap 禁用 zram swap 1 2 3 systemctl list-units --type=swap sudo systemctl mask dev-zram0.swap reboot 查看 swap 使用情况 1 2 3 4 5 6 # 没有输出的话就是没有启用 swap swapon --show swapon free -m cat /proc/swaps vmstat 1 5 1 2 3 4 NAME TYPE SIZE USED PRIO /dev/vda2 partition 1.9G 1.5G

go regex, 正则 1 2 3 4 5 6 nodes := []string{"foo.bar-000.x", "foo.t0.bar","foo.bar"} reg := regexp.MustCompile(`foo\.(.[^\.]*)\.{0,1}.*`) for _, v := range nodes { result := reg.FindSubmatch([]byte(v)) fmt.Println("output: ", string(result[1])) } [^a-zA-Z ]+, 匹配所有不是小写大写字母和空格的字符 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 . 匹配任