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

mlafeldt

/* This is the original elf.h file from the GNU C Library; I only removed
   the inclusion of feature.h and added definitions of __BEGIN_DECLS and
   __END_DECLS as documented in
   https://cmd.inp.nsk.su/old/cmd2/manuals/gnudocs/gnudocs/libtool/libtool_36.html

   On macOS, simply copy the file to /usr/local/include/. 

   Mathias Lafeldt <[email protected]> */

/* This file defines standard ELF types, structures, and macros.

1wErt3r

;SMBDIS.ASM - A COMPREHENSIVE SUPER MARIO BROS. DISASSEMBLY
;by doppelganger ([email protected])

;This file is provided for your own use as-is.  It will require the character rom data
;and an iNES file header to get it to work.

;There are so many people I have to thank for this, that taking all the credit for
;myself would be an unforgivable act of arrogance. Without their help this would
;probably not be possible.  So I thank all the peeps in the nesdev scene whose insight into
;the 6502 and the NES helped me learn how it works (you guys know who you are, there's no 

randrews

setmetatable(_ENV, { __index=lpeg })

Scopes = { {} }

function eval_expr(expr)
    local accum = eval(expr[2]) -- because 1 is "expr"
    for i = 3, #expr, 2 do
        local operator = expr[i]
        local num2 = eval(expr[i+1])

uupaa

Image source

https://gyazo.com/eb5c5741b6a9a16c692170a41a49c858.png

Try resize it!

• ![](https://gyazo.com/eb5c5741b6a9a16c692170a41a49c858.png | width=100)

bkaradzic

Orthodox C++

This article has been updated and is available here.

loderunner

ld – Wading through Mac OS X linker hell

Intro

Friend: I tried looking at static linking in Mac OS X and it seems nearly impossible. Take a look at this http://stackoverflow.com/a/3801032

Me: I have no idea what that -static flag does, but I'm pretty sure that's not how you link to a library. Let me RTFM a bit.

Minutes later...

hewittc

#!/usr/bin/env python3
'''
test.c - clang -o test.so -fPIC -shared test.c
----------------------------------------------

extern int baz();

int foo() {
  return 42;
}

list27.txt

000(023Rb|001Rb)
001(017La|002Rb)
002(021La|003Rb)
003(021La|004La)
004(009Rb|005Lb)
005(004Ra|005La)
006(008La|007La)
007(009Rb|007La)
008(009Ra|008La)
009(010Ra|026Ra)

pointhi

#!/usr/bin/env python
# -*- coding: utf-8 -*-

# This script is a simple test to do image operations on pyopencl in combination with PIL
#
# based on the code of: https://gist.github.com/likr/3735779

import pyopencl as cl
import numpy