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jeongho / latency.txt
Created April 28, 2017 06:16 — forked from jboner/latency.txt
Latency Numbers Every Programmer Should Know
Latency Comparison Numbers
--------------------------
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
@EdwinChan
EdwinChan / nested.py
Last active May 8, 2024 20:58
Trick for using multiprocessing with nested functions and lambda expressions
import concurrent.futures
import multiprocessing
import sys
import uuid
def globalize(func):
def result(*args, **kwargs):
return func(*args, **kwargs)
result.__name__ = result.__qualname__ = uuid.uuid4().hex
setattr(sys.modules[result.__module__], result.__name__, result)
@jeongho
jeongho / haproxy_cloudera.cfg
Last active October 19, 2020 02:30
haproxy config for Cloudera
#yum install haproxy
#configure haproxy-cloudera.cfg
#haproxy -f /etc/haproxy/haproxy-cloudera.cfg
#http://seawolf-3.vpc.wonderland.com:1936/
#https://cbonte.github.io/haproxy-dconv/
global
daemon
nbproc 1
maxconn 100000
@karpathy
karpathy / min-char-rnn.py
Last active November 16, 2024 07:19
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)
@Chaser324
Chaser324 / GitHub-Forking.md
Last active November 14, 2024 08:32
GitHub Standard Fork & Pull Request Workflow

Whether you're trying to give back to the open source community or collaborating on your own projects, knowing how to properly fork and generate pull requests is essential. Unfortunately, it's quite easy to make mistakes or not know what you should do when you're initially learning the process. I know that I certainly had considerable initial trouble with it, and I found a lot of the information on GitHub and around the internet to be rather piecemeal and incomplete - part of the process described here, another there, common hangups in a different place, and so on.

In an attempt to coallate this information for myself and others, this short tutorial is what I've found to be fairly standard procedure for creating a fork, doing your work, issuing a pull request, and merging that pull request back into the original project.

Creating a Fork

Just head over to the GitHub page and click the "Fork" button. It's just that simple. Once you've done that, you can use your favorite git client to clone your repo or j

@mikeyk
mikeyk / watch_wal-e.py
Created January 16, 2013 20:24
Watch_wal-e script
#! /usr/bin/env python
from boto.ses.connection import SESConnection
import os
import sys
import subprocess
import socket
TMPFILE = '/var/run/postgresql/last-wal-archive-error-file.tmp'
if __name__ == '__main__':
@jnatkins
jnatkins / pom.xml
Created August 29, 2012 18:56
A sample POM for setting up a basic Maven project for CDH application development
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<!-- Replace the group ID with your group ID -->
<groupId>com.mycompany.hadoopproject</groupId>
<!-- Replace the artifact ID with the name of your project -->
<artifactId>my-hadoop-project</artifactId>
<version>1.0-SNAPSHOT</version>
<packaging>jar</packaging>
@phred
phred / pedantically_commented_playbook.yml
Last active June 27, 2024 13:39
Very complete Ansible playbook, showing off all the options
---
####
#### THIS IS OLD AND OUTDATED
#### LIKE, ANSIBLE 1.0 OLD.
####
#### PROBABLY HIT UP https://docs.ansible.com MY DUDES
####
#### IF IT BREAKS I'M JUST SOME GUY WITH
#### A DOG, OK, SORRY
####
@jboner
jboner / latency.txt
Last active November 15, 2024 14:00
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