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This.isDevOps(powah_code=36)

Thuan Duong thuandt

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This.isDevOps(powah_code=36)
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@thuandt
thuandt / userChrome.css
Last active August 29, 2015 14:20
userChrome.css
/* Disable "List all Tabs" Button */
.tabs-alltabs-button {
display: none !important;
}
/* Disable Container box for "List all Tabs" Button */
.tabs-alltabs-box {
display: none !important;
}
@thuandt
thuandt / unique_digit_prime.py
Created December 8, 2012 23:53 — forked from lewtds/unique_digit_prime.py
Tìm số nguyên tố lớn nhất có 9 chữ số và các chữ số khác nhau từng đôi một
#!/usr/bin/env python
# -*- coding: utf-8 -*-
#
# Filename: prime.py
#
# Description: Tìm số nguyên tố lớn nhất có 9 chữ số khác nhau
#
# Created: 12/09/2012 06:32:33 AM
# Last Modified: 12/09/2012 06:40:49 AM
@thuandt
thuandt / latency.markdown
Created January 11, 2013 19:57 — forked from hellerbarde/latency.markdown

Latency numbers every programmer should know

L1 cache reference ......................... 0.5 ns
Branch mispredict ............................ 5 ns
L2 cache reference ........................... 7 ns
Mutex lock/unlock ........................... 25 ns
Main memory reference ...................... 100 ns             
Compress 1K bytes with Zippy ............. 3,000 ns  =   3 µs
Send 2K bytes over 1 Gbps network ....... 20,000 ns  =  20 µs
SSD random read ........................ 150,000 ns  = 150 µs

Read 1 MB sequentially from memory ..... 250,000 ns = 250 µs

@thuandt
thuandt / gcd.py
Created January 17, 2013 01:02
Greatest Common Divisor using Recursion in Python source: http://code.activestate.com/recipes/578421-greatest-common-divisor-using-recursion-in-python/
import sys
def gcd(a, b):
t = b
b = a % b
if b == 0:
return t
else:
return gcd(t, b)
@thuandt
thuandt / raster_font.cpp
Created March 5, 2013 15:40
#include <GL/gl.h>
#include <GL/glut.h>
GLubyte rasters[24] = { 0x00, 0x00,
0x06, 0x00,
0x06, 0x00,
0x06, 0x00,
0x06, 0x00,
0x06, 0x00,
0x06, 0x00,
@thuandt
thuandt / star_animation.cpp
Created March 12, 2013 06:31
Star Animation
#include <GL/gl.h>
#include <GL/glut.h>
#include <cmath>
static GLfloat spin = 0.0;
void init(void)
{
glClearColor(0.0, 0.0, 0.0, 0.0);
glShadeModel(GL_FLAT);
@thuandt
thuandt / umask
Created May 1, 2013 06:37
UNIX/Linux umask
Umask Created Files Created Directories
-------------------------------------------------------------
000 666 (rw-rw-rw-) 777 (rwxrwxrwx)
002 664 (rw-rw-r--) 775 (rwxrwxr-x)
022 644 (rw-r--r--) 755 (rwxr-xr-x)
027 640 (rw-r-----) 750 (rwxr-x---)
077 600 (rw-------) 700 (rwx------)
277 400 (r--------) 500 (r-x------)
@thuandt
thuandt / bash_shortcuts
Created May 1, 2013 21:39
Keyboard Shortcuts for Bash
Ctrl + A Go to the beginning of the line you are currently typing on
Ctrl + E Go to the end of the line you are currently typing on
Ctrl + L Clears the Screen, similar to the clear command
Ctrl + U Clears the line before the cursor position. If you are at the end of the line, clears the entire line.
Ctrl + H Same as backspace
Ctrl + R Let’s you search through previously used commands
Ctrl + C Kill whatever you are running
Ctrl + D Exit the current shell
Ctrl + Z Puts whatever you are running into a suspended background process. fg restores it.
Ctrl + W Delete the word before the cursor
@thuandt
thuandt / keybase.md
Created March 25, 2016 08:13

Keybase proof

I hereby claim:

  • I am thuandt on github.
  • I am thuandt (https://keybase.io/thuandt) on keybase.
  • I have a public key ASAOXz-V0iQWVO2CXIGKgcuhu_js3JzwICItI0Szy2unOAo

To claim this, I am signing this object:

@thuandt
thuandt / zfs-raidz.md
Created March 31, 2016 19:02
ZFS RAID-Z NOTES

RAID-Z

The strongest valid recommendation based on exact fitting of blocks into stripes is the following: If you are using RAID-Z with 512-byte sector devices with recordsize=4K or 8K and compression=off (but you probably want compression=lz4): use at least 5 disks with RAIDZ1; use at least 6 disks with RAIDZ2; and use at least 11 disks with RAIDZ3.

To summarize: Use RAID-Z. Not too wide. Enable compression.