fogus

main(argc, argv)
int argc;
char *argv[];
{
	int i;

	argc--;
	for(i=1; i<=argc; i++)
		printf("%s%c", argv[i], i==argc? '\n': ' ');
}

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

dmfutcher

;; Simple TCP echo server in x86_64 assembly, using Linux syscalls
;;
;;         nasm -felf64 -o server.o server.asm
;;        ld server.o -o server
;;         ./server
;;

global _start

;; Data definitions

vivianspencer

Debian 8 Hardening

1. Update root's mail recipient. Open /etc/aliases replacing administrator@example.tld with an administrator's email address. This is where logs will be emailed.

   root:     administrator@example.tld
   

2. Update the the default umask to 027. Edit the file /etc/init.d/rc and change the following setting:

umask 027