justjkk

The MIT License (MIT)

Copyright (c) 2015 J Kishore Kumar

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

sharth

/* Example of a library interposer: interpose on malloc().
 * gcc -D_GNU_SOURCE -fPIC -O2 -Wall -o malloc_interposer.so -shared malloc_interposer.c -ldl
 * setenv LD_PRELOAD $cwd/malloc_interposer.so
 * run the app
 */

#include <stdio.h>
#include <dlfcn.h>
#include <string.h>

hellerbarde

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

RhubarbSin

Markup Cheat sheet for Org-mode

Heading 1

Heading 2: Set a deadline and a schedule

[66%] Heading 3: a list with checkboxes

1. [X] task 1
2. [X] task 2
3. [ ] task 3 (C-c C-c to toggle status of checkbox)

lukego

sed -E -e 's/^/    /g' -e 's/^    --- ?//g' | pandoc -o listing.pdf -

That expression is a cheap literate programming system for Markdown.
Start commentary lines with '--- ' and they will be
markdown-formatted, the rest will be code. (Uses Lua comment syntax.)

Finally the right implementation of this idea:
  http://fresh.homeunix.net/~luke/misc/emacs/pbook.pdf (program)
  http://fresh.homeunix.net/~luke/misc/erlang/regtest.pdf (better example)

aaronwolen

% Title % Name % Date

My first slide

List

jayjanssen

this is a sample of output:

root@percona-db-2:~# iperf -s -u -B 226.94.1.1 -i 1
------------------------------------------------------------
Server listening on UDP port 5001
Binding to local address 226.94.1.1
Joining multicast group  226.94.1.1
Receiving 1470 byte datagrams
UDP buffer size:   122 KByte (default)
------------------------------------------------------------

rofl0r

#define _XOPEN_SOURCE 700
#include <signal.h>
#include <unistd.h>

int main()
{
	sigset_t set;
	int status;

	if (getpid() != 1) return 1;

ksafranski

Intro

TCL-Expect scripts are an amazingly easy way to script out laborious tasks in the shell when you need to be interactive with the console. Think of them as a "macro" or way to programmaticly step through a process you would run by hand. They are similar to shell scripts but utilize the .tcl extension and a different #! call.

Setup Your Script

The first step, similar to writing a bash script, is to tell the script what it's executing under. For expect we use the following:

#!/usr/bin/expect

avendael

" Show tab numbers
set guioptions+=n

" Hide scrollbars
set guioptions-=r

" zenburn color theme
colo zenburn

" Default editor when C-i is invoked