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

hantuo

package main

type I interface {
  Foo()
}

type A struct {

}

klange

Since this is on Hacker News and reddit...

• No, I don't distribute my résumé like this. A friend of mine made a joke about me being the kind of person who would do this, so I did (the link on that page was added later). My actual résumé is a good bit crazier.
• I apologize for the use of _t in my types. I spend a lot of time at a level where I can do that; "reserved for system libraries? I am the system libraries".
• Since people kept complaining, I've fixed the assignments of string literals to non-const char *s.
• My use of type * name, however, is entirely intentional.
• If you're using an older compiler, you might have trouble with the anonymous unions and the designated initializers - I think gcc 4.4 requires some extra braces to get them working together. Anything reasonably recent should work fine. Clang and gcc (newer than 4.4, at le

sanatgersappa

package main

import (
    "html/template"
	"io"
	"net/http"
	"os"
)

//Compile templates on start

purohit

package LevenshteinDistance

import "math"

func compare(a, b string) int {
	var cost int
	d := make([][]int, len(a)+1)
	for i := 0; i < len(d); i++ {
		d[i] = make([]int, len(b)+1)
	}

trinitronx

#!/bin/sh
# 2021-12-09:
#   This script is no longer supported!
#   Apple broke all direct downloads without logging with an Apple ID first.
#   The number of hoops that a script would need to jump through to login,
#   store cookies, and download is prohibitive.
#   Now we all must manually download and mirror the files for this to work at all :'-(

OSX_VERS=$(sw_vers -productVersion | awk -F "." '{print $2}')

philfreo

#!/usr/bin/perl



use Mysql;
use strict;
use vars qw($school_name);
use vars qw($pass);

require "./cgi-lib.pl";

night-before-opsmas.txt

'Twas the night before Christmas, when all through the racks
Not a server was alerting, not even Compaqs.
The backups were written to tapes with care
In hopes that later the data would be there.

The machines were nestled all snug in their sleds
Whilst visions of vengeance danced in their heads;
And oncall in his three-wolf and I in my rack.
Had just settled down for some syn and some ack.

kyledrake

# The blog post that started it all: https://neocities.org/blog/the-fcc-is-now-rate-limited
#
# Current known FCC address ranges:
# https://news.ycombinator.com/item?id=7716915
#
# Confirm/locate FCC IP ranges with this: http://whois.arin.net/rest/net/NET-165-135-0-0-1/pft
#
# In your nginx.conf:

location / {

michaljemala

package main

import (
	"crypto/tls"
	"crypto/x509"
	"flag"
	"io/ioutil"
	"log"
	"net/http"
)