jboner

Latency Comparison Numbers (~2012)
----------------------------------
L1 cache reference                           0.5 ns
Branch mispredict                            5   ns
L2 cache reference                           7   ns                      14x L1 cache
Mutex lock/unlock                           25   ns
Main memory reference                      100   ns                      20x L2 cache, 200x L1 cache
Compress 1K bytes with Zippy             3,000   ns        3 us
Send 1K bytes over 1 Gbps network       10,000   ns       10 us
Read 4K randomly from SSD*             150,000   ns      150 us          ~1GB/sec SSD

s4y

var child_process = require('child_process');

// exec: spawns a shell.
child_process.exec('ls -lah /tmp', function(error, stdout, stderr){
	console.log(stdout);
});

// execFile: executes a file with the specified arguments
child_process.execFile('ls', ['-lah', '/tmp'], function(error, stdout, stderr){
	console.log(stdout);

un33k

FILE SPACING:

 # double space a file
 sed G

 # double space a file which already has blank lines in it. Output file
 # should contain no more than one blank line between lines of text.
 sed '/^$/d;G'

mbostock

license: gpl-3.0