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John Allen JohnAllen

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@jboner
jboner / latency.txt
Last active May 2, 2024 09:45
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
@karpathy
karpathy / min-char-rnn.py
Last active May 1, 2024 11:00
Minimal character-level language model with a Vanilla Recurrent Neural Network, in Python/numpy
"""
Minimal character-level Vanilla RNN model. Written by Andrej Karpathy (@karpathy)
BSD License
"""
import numpy as np
# data I/O
data = open('input.txt', 'r').read() # should be simple plain text file
chars = list(set(data))
data_size, vocab_size = len(data), len(chars)
@magickatt
magickatt / github_clone_using_token.sh
Created September 6, 2019 17:31
Clone a GitHub repository using a Personal Access Token
export GITHUB_USER=magickatt
export GITHUB_TOKEN=secret
export GITHUB_REPOSITORY=magickatt/ContainerisingLegacyApplicationsTalk
git clone https://${GITHUB_USER}:${GITHUB_TOKEN}@github.com/${GITHUB_REPOSITORY}
@chrishulbert
chrishulbert / main.rs
Created August 27, 2023 13:15
Interactive Brokers TWS API in Rust
// MIT licensed.
use std::net::TcpStream;
use std::io::{Read, Write};
use std::sync::mpsc::channel;
use std::thread;
fn main() {
let mut stream = TcpStream::connect("127.0.0.1:7496").expect("connect");
stream.set_nodelay(true).expect("nodelay"); // Because we're wannabe HFT traders.
@sebastianwebber
sebastianwebber / pg-notify-parallel.go
Last active March 11, 2024 15:45
postgres listen/notifiy with golang and `go-pg`
package main
import (
"log"
"time"
"github.com/go-pg/pg"
)
const maxWorkers = 5
@justsml
justsml / fetch-api-examples.md
Last active February 24, 2024 18:05
JavaScript Fetch API Examples
@rfikki
rfikki / lightclient-peers-mainnet-latest.txt
Last active August 2, 2023 14:06
Updated 04/18/2021
admin.addPeer("enode://da0c61fe14ba9da1a9835b59d811553d21787448724cfe6412bc17f0b14586df91826d8286b2137342d09a8631df5ea548cf301294b05657c2a90f9c3d526721@143.198.119.44:30303");
admin.addPeer("enode://3e2287c6caf363357efc600611ccb777e6997ef8b749b1f87e94d3a7d2b466bbefba163b0620c88804f18bc70cfbe68538720ac2644fc1c970848488cdca0c7a@143.198.114.251:30303");
admin.addPeer("enode://15ea76b5d30ce9eaabf6a9a8fe5ca0ff032534d296b5b8ca6e00a730d08a4aaa019077c382a6b2d08ebc7cf6f8eb888f5e00e0dd378798e3459a555538654370@157.230.6.79:30303");
admin.addPeer("enode://2e718763172902a8fa4bcdda45f77a5c2688de5230e184d154e4867922b8f6ad23e1016379715cb5f55f6c79060563f93896035e35dfb47361d08599d4908ae8@143.198.118.178:30303");
admin.addPeer("enode://9d45f21eeb37bd5555fac0c4094ae3d4d144d93e2313aeb891bf3054b0dcf6ca817961ed29ea1de00389b5c36dc6bbe9b00443e367b16ed8ba251cea6c242044@94.176.237.140:30303");
admin.addPeer("enode://2493b5b8407ccb1c448d7ad358e838066640f273442730caf80acde2fe98522b1d9dcebd2dc982efe44911a49779888fe72defc181c29596facff05e1
@robert52
robert52 / money.model.js
Last active November 11, 2022 17:40
Approaches to create and combine models in mongoose. Document referencing, model composition and many more.
'use strict';
const DEF_CURRENCY = 'USD';
const DEF_SCALE_FACTOR = 100;
const mongoose = require('mongoose');
const Schema = mongoose.Schema;
const ObjectId = Schema.ObjectId;
const MoneySchema = new Schema({
@rfikki
rfikki / ropsten-peers-latest.txt
Last active September 24, 2022 03:23
Updated July 15, 2020: Ropsten Latest Peers with Istanbul - IMPORTANT RUN THE LATEST RELEASE OF THE CLIENT - https://geth.ethereum.org/downloads/
admin.addPeer("enode://8c5131f577ee602ccaad5e5f600011c024d43d33e6af6f8a89ed26cbfadd7efe903a8e426dde4071b857e0838a2efa29ae3b268f8b55acd59e72d4a919673cbc@13.251.47.174:30303");
admin.addPeer("enode://798b8eba7b65cdd71bb061a6b18a1f7d16612d54e1aa542d8dc5c3573322b5dd7496c1eea100dbb84f8495d89f3d5ddb4142b0006a73cd32daa2f643bd5d1c76@175.24.29.183:30311");
admin.addPeer("enode://9a4be35fec78cf91e7e959029ae3f5d3d3e86446186eb14f181c8f3b9917f57839ef98d4ba53cf06eb4fea696ecc14796b34d96db4f4294864edfcab27dd9956@31.220.51.107:30303");
admin.addPeer("enode://2763ab6d19d6e7ce7a953ba95c9a87fe6ae5eac3434bf216282f53142d89cb5451faa701311d7de1d79cc8ecbd57f1781156e26f5722aee835547aeab870e385@52.237.88.221:30303");
admin.addPeer("enode://81488a6c0b62aa14a1172d607893b6317e4f2565ca2bd73c7c0b8bfd55842af6b7972218728d1f352b3fddc61d0dccbf92e81d2bbfdc375db44ae44ee332d4db@88.198.59.75:30303");
admin.addPeer("enode://3d55f613d74e90f5b8a4154d20d8a7260a973751c1402bf52adde2b08b72a9e0327a522bf187765f2d6e2a3b893dfe7aa41b204bce5f793bd9470f24fa3aafc
@learner-long-life
learner-long-life / Rinkeby.md
Last active August 30, 2022 22:32
How to get on Rinkeby Testnet in less than 10 minutes

How to get on Rinkeby Testnet in less than 10 minutes

Following instructions from the excellent https://www.rinkeby.io/

Synchronizing a Full Node

A full node lets you access all state. There is a light node (state-on-demand) and wallet-only (no state) instructions as well,