jim0409

軟體工程師面試資源最簡整理與技巧分享

前言

只要是在 CS 產業，想要當軟體工程師，基本的資料結構和演算法功力是必須要時時打磨的，這次就整理一些好用的工具，而且盡量把資源最小化，讓大家在準備面試時有足夠資源，又不會被太多資料弄得暈頭轉向。

線上練習寫 code 網站

• Hackerrank

jim0409

package main

import (
	"fmt"
)

type Node struct {
	Value int
}

jim0409

# post_loc.txt contains the json you want to post
# -p means to POST it
# -H adds an Auth header (could be Basic or Token)
# -T sets the Content-Type
# -c is concurrent clients
# -n is the number of requests to run in the test

ab -p post_loc.txt -T application/json -H 'Authorization: Token abcd1234' -c 10 -n 2000 http://example.com/api/v1/locations/

jim0409

@startuml
' uncomment the line below if you're using computer with a retina display
' skinparam dpi 300
!define Table(name,desc) class name as "desc" << (T,#FFAAAA) >>
' we use bold for primary key
' green color for unique
' and underscore for not_null
!define primary_key(x) <b>x</b>
!define unique(x) <color:green>x</color>
!define not_null(x) <u>x</u>

jim0409

Resize root partition (or how to remove the default /home partition) on CentOS 7 online

This requires you to be able to ssh into the instance using the root user account and that no services be running as users out of /home on the target machine.

The examples are from a default installation with no customation-you NEED to know what you're working with for volumes/partitions to not horribly break things.

By default, CentOS 7 uses XFS for the file system and Logical Volume Manager (LVM), creating 3 partitions: /,/home and

Step 1 - Copy /home Contents

To backup the contents of /home, do the following:

jim0409

Pico HTTP Server in C

This is a very simple HTTP server for Unix, using fork(). It's very easy to use

How to use

1. include header httpd.h
2. write your route method, handling requests.
3. call serve_forever("12913") to start serving on port 12913

jim0409

Install Nginx on Mac OS from source

no Homebrew required

1. Download Nginx

$ cd /usr/local/src
$ curl -OL http://nginx.org/download/nginx-1.12.2.tar.gz
$ tar -xvzf nginx-1.12.2.tar.gz && rm nginx-1.12.2.tar.gz

jim0409

Moved to git repository: https://github.com/denji/nginx-tuning

NGINX Tuning For Best Performance

For this configuration you can use web server you like, i decided, because i work mostly with it to use nginx.

Generally, properly configured nginx can handle up to 400K to 500K requests per second (clustered), most what i saw is 50K to 80K (non-clustered) requests per second and 30% CPU load, course, this was 2 x Intel Xeon with HyperThreading enabled, but it can work without problem on slower machines.

You must understand that this config is used in testing environment and not in production so you will need to find a way to implement most of those features best possible for your servers.

jim0409

This gist has been moved to its own Github repo, so it's easier to contribute with additions and corrections. Please open a PR there if you see any mistake, I don't track comments on here as there's no notification system for gists AFAIK. Thanks.

Tabs and Windows

Function	Shortcut
Previous Tab	⌘+ Left Arrow
Next Tab	⌘+ Right Arrow
Go to Tab	⌘ + Number

jim0409

#!/bin/sh
parse_yaml() {
   local prefix=$2
   local s='[[:space:]]*' w='[a-zA-Z0-9_]*' fs=$(echo @|tr @ '\034')
   sed -ne "s|^\($s\)\($w\)$s:$s\"\(.*\)\"$s\$|\1$fs\2$fs\3|p" \
        -e "s|^\($s\)\($w\)$s:$s\(.*\)$s\$|\1$fs\2$fs\3|p"  $1 |
   awk -F$fs '{
      indent = length($1)/2;
      vname[indent] = $2;
      for (i in vname) {if (i > indent) {delete vname[i]}}