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@jboner
jboner / latency.txt
Last active May 3, 2024 01:00
Latency Numbers Every Programmer Should Know
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
@piscisaureus
piscisaureus / pr.md
Created August 13, 2012 16:12
Checkout github pull requests locally

Locate the section for your github remote in the .git/config file. It looks like this:

[remote "origin"]
	fetch = +refs/heads/*:refs/remotes/origin/*
	url = git@github.com:joyent/node.git

Now add the line fetch = +refs/pull/*/head:refs/remotes/origin/pr/* to this section. Obviously, change the github url to match your project's URL. It ends up looking like this:

@bishboria
bishboria / springer-free-maths-books.md
Last active April 25, 2024 06:27
Springer made a bunch of books available for free, these were the direct links
@adrienbrault
adrienbrault / llama2-mac-gpu.sh
Last active April 22, 2024 08:47
Run Llama-2-13B-chat locally on your M1/M2 Mac with GPU inference. Uses 10GB RAM. UPDATE: see https://twitter.com/simonw/status/1691495807319674880?s=20
# Clone llama.cpp
git clone https://github.com/ggerganov/llama.cpp.git
cd llama.cpp
# Build it
make clean
LLAMA_METAL=1 make
# Download model
export MODEL=llama-2-13b-chat.ggmlv3.q4_0.bin
@ErikAugust
ErikAugust / spectre.c
Last active April 15, 2024 13:55
Spectre example code
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#ifdef _MSC_VER
#include <intrin.h> /* for rdtscp and clflush */
#pragma optimize("gt",on)
#else
#include <x86intrin.h> /* for rdtscp and clflush */
#endif
@dahlia
dahlia / lisp.rb
Created September 2, 2010 07:52
30 minutes Lisp in Ruby
# 30 minutes Lisp in Ruby
# Hong Minhee <http://dahlia.kr/>
#
# This Lisp implementation does not provide a s-expression reader.
# Instead, it uses Ruby syntax like following code:
#
# [:def, :factorial,
# [:lambda, [:n],
# [:if, [:"=", :n, 1],
# 1,
@jcs
jcs / openbsd_cbp.md
Last active April 2, 2024 20:18
OpenBSD (with encrypted softraid) on the Chromebook Pixel (2015)
#!/usr/bin/env bash
set -e
if [ -e static ]; then
rm -r static
fi
mkdir -p static
sass src/sass/main.scss > static/application.css
$(npm bin)/browserify src/js/main.js > static/application.js
@pervognsen
pervognsen / shift_dfa.md
Last active January 27, 2024 19:54
Shift-based DFAs

A traditional table-based DFA implementation looks like this:

uint8_t table[NUM_STATES][256]

uint8_t run(const uint8_t *start, const uint8_t *end, uint8_t state) {
    for (const uint8_t *s = start; s != end; s++)
        state = table[state][*s];
    return state;
}
@ericlagergren
ericlagergren / index.gohtml
Last active December 22, 2023 17:51
Hot-reloading / hot-swapping live template files in Go
My name is {{.Name}} and I'm {{.Age}} years old!!