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// Variables used by Scriptable. | |
// These must be at the very top of the file. Do not edit. | |
// icon-color: gray; icon-glyph: magic; | |
// Defaults to the latest version and no automatic update; if the file exists, just use it | |
const moment = await require('moment'); | |
// Use any SemVer options to specify a version you want | |
// Refer to the calculator here: https://semver.npmjs.com/ | |
const lodash = await require('lodash@^3.9.1'); |
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// Variables used by Scriptable. | |
// These must be at the very top of the file. Do not edit. | |
// icon-color: brown; icon-glyph: file-code; | |
// To use this script, you need to configure an OAuth App on GitHub. | |
// Follow the instructions on the link below to create your OAuth App. | |
// | |
// When you are asked to put in a redirect URL, you should put the URL for running this script in Scriptable. Assuming the name of this script is "Create Gist", the URL is scriptable:///run?scriptName=Create%20Gist | |
// | |
// https://developer.github.com/apps/building-oauth-apps/creating-an-oauth-app/ | |
// |
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//! A doubly-linked list in 50 LOCs of stable and safe Rust. | |
use std::cell::RefCell; | |
use std::rc::{Rc, Weak}; | |
use std::fmt::Display; | |
// The node type stores the data and two pointers. | |
// | |
// It uses Option to represent nullability in safe Rust. It has zero overhead | |
// over a null pointer due to the NonZero optimization. | |
// |
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
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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 |