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@jboner
jboner / latency.txt
Last active August 3, 2026 11:42
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
@curioustechizen
curioustechizen / EnhancedCheckBox.java
Last active September 14, 2020 05:50
Android programmatically checkable widgets, differentiate between user clicks & programmatic setChecked calls. Based on this answer on StackOverflow: http://stackoverflow.com/a/14307643/570930. There are times when setting a switch to ON results in some action (Save to DB/ perform an HTTP POST etc). However, you want this action to happen only o…
/**
* An enhanced {@code CheckBox} that differentiates between user clicks and
* programmatic clicks. In particular, the {@code OnCheckedChangeListener} is
* <strong>not</strong> triggered when the state of the checkbox is changed
* programmatically.
*
*/
public class EnhancedCheckBox extends CheckBox implements ProgrammaticallyCheckable{
private CompoundButton.OnCheckedChangeListener mListener = null;
public EnhancedCheckBox(Context context) {
@AlexBlokh
AlexBlokh / RatioViewPager.java
Last active March 31, 2017 11:36
ViewPager with custom aspect ratio
public class RatioViewPager extends ViewPager {
private float mRatio = 1f;
public RatioViewPager(Context context) {
super(context);
}
public RatioViewPager(Context context, AttributeSet attrs) {
super(context, attrs);
@nickbutcher
nickbutcher / 1 search_bar.xml
Last active March 12, 2026 14:50
Demonstrating morphing a search icon into a search field. To do this we use an AnimatedVectorDrawable (https://developer.android.com/reference/android/graphics/drawable/AnimatedVectorDrawable.html) made up of two paths. The first is the search icon (as a single line) the second is the horizontal bar. We then animate the 'trimPathStart' property …
<?xml version="1.0" encoding="utf-8"?>
<!--
Copyright (C) 2015 The Android Open Source Project
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
@karpathy
karpathy / llm-wiki.md
Created April 4, 2026 16:25
llm-wiki

LLM Wiki

A pattern for building personal knowledge bases using LLMs.

This is an idea file, it is designed to be copy pasted to your own LLM Agent (e.g. OpenAI Codex, Claude Code, OpenCode / Pi, or etc.). Its goal is to communicate the high level idea, but your agent will build out the specifics in collaboration with you.

The core idea

Most people's experience with LLMs and documents looks like RAG: you upload a collection of files, the LLM retrieves relevant chunks at query time, and generates an answer. This works, but the LLM is rediscovering knowledge from scratch on every question. There's no accumulation. Ask a subtle question that requires synthesizing five documents, and the LLM has to find and piece together the relevant fragments every time. Nothing is built up. NotebookLM, ChatGPT file uploads, and most RAG systems work this way.