jboner

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

jasonbartz

Deploying pypy on uwsgi

Instructions are kind of sporadic around the internet, so I thought I would gather them all in one place. The following example uses a Flask app as the thing deployed. You should only have to this once, and then you can pass the bin around.

Requirements

• pypy 2.x (tested)
• uwsgi 1.9.11+ (trunk as of this gist)

Build translated pypy binary and pypy lib.

JeffBelback

#!/bin/bash
# Stop all containers
containers=`docker ps -a -q`
if [ -n "$containers" ] ; then
        docker stop $containers
fi
# Delete all containers
containers=`docker ps -a -q`
if [ -n "$containers" ]; then
        docker rm -f -v $containers

loderunner

Profiling an application in Mac OS X

Finding which process to profile

If your system is running slowly, perhaps a process is using too much CPU time and won't let other processes run smoothly. To find out which processes are taking up a lot of CPU time, you can use Apple's Activity Monitor.

The CPU pane shows how processes are affecting CPU (processor) activity:

joshenders

Successful mitmproxy-3.7 setup tested on OS X 10.13.6 and iPhone X running 12.1.4

Enable IP forwarding and disable ICMP redirects to keep the iPad sending traffic to the proxy

sudo sysctl -w net.inet.ip.forwarding=1
sudo sysctl -w net.inet.ip.redirect=0

net.inet.ip.forwarding
Enable IP forwarding between interfaces

vukanac

Skip this:

brew tap homebrew/dupes
brew tap homebrew/versions

As:

Warning: homebrew/dupes was deprecated. This tap is now empty as all its formulae were migrated.
Warning: homebrew/versions was deprecated. This tap is now empty as all its formulae were migrated.

kishmakov

SAN_CMP := -fno-omit-frame-pointer -fsanitize=address
SAN_STAT := -static-libstdc++ -static-libasan

BIN_CMP := -std=c++11 -c -I. main.cpp -O -g3 -o main.o
LIB_CMP := -std=c++11 my.cpp -o libmy.so -shared -fPIC -g3	

RUN := LD_LIBRARY_PATH=. ASAN_OPTIONS=symbolize=1 ASAN_SYMBOLIZER_PATH=$(shell which llvm-symbolizer)
PRELOAD := LD_PRELOAD=/usr/lib/x86_64-linux-gnu/libasan.so.1

lib-gcc: 

timvisee

Falsehoods programmers believe about time

This is a compiled list of falsehoods programmers tend to believe about working with time.

Don't re-invent a date time library yourself. If you think you understand everything about time, you're probably doing it wrong.

Falsehoods

• There are always 24 hours in a day.
• February is always 28 days long.
• Any 24-hour period will always begin and end in the same day (or week, or month).

kevashcraft

Kubernetes on DigitalOcean with CoreOS

Let's look at an example of how to launch a Kubernetes cluster from scratch on DigitalOcean, including kubeadm, an Nginx Ingress controller, and Letsencrypt certificates.

Overview

Environment

We'll be creating a four-node cluster (k8s-master, k8s-000...k8s-002), load balancer, and ssl certificates.

Table of Contents

1. Install Kubernetes

d00m4ace

AI Voice Cloning

Table of Contents

• Services
• Guides, Colabs, etc
• Tools
• See Also