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

djspiewak

Thread Pools

Thread pools on the JVM should usually be divided into the following three categories:

1. CPU-bound
2. Blocking IO
3. Non-blocking IO polling

Each of these categories has a different optimal configuration and usage pattern.

jasonrudolph

# Credit http://stackoverflow.com/a/2514279
for branch in `git branch -r | grep -v HEAD`;do echo -e `git show --format="%ci %cr" $branch | head -n 1` \\t$branch; done | sort -r

bittner

Ctrl + Alt + Space

YordanGeorgiev

<!-- all you need to know about log levels src: https://i.stack.imgur.com/Z5mag.png -->
<?xml version="1.0" encoding="UTF-8"?>
<configuration>
 <logger name="com.datastax.driver.core.QueryLogger.SLOW" level="DEBUG" />

    <appender name="console" class="ch.qos.logback.core.ConsoleAppender">
        <encoder>
            <pattern> %d{yyyy-MM-dd HH:mm:ss.SSS} [%level] %msg %n</pattern>
        </encoder>
    </appender>

Piasy

brew options ffmpeg

brew install ffmpeg \
--with-chromaprint \
--with-fdk-aac \
--with-fontconfig \
--with-freetype \
--with-frei0r \
--with-game-music-emu \
--with-libass \

yannhowe

# Image neeeds to have ssh-client
image: docker:git

services:
  - docker:dind

stages:
  - staging
before_script:
  - docker login -u gitlab-ci-token -p $CI_BUILD_TOKEN $CI_REGISTRY

normoes

This can be used to retreive files/binaries/information from docker containers.

#!/bin/bash

set -Eeuo pipefail

mkdir ./binary || true

# build most recent docker image

bobthecow

#!/bin/bash
#
# Open new Terminal tabs from the command line
#
# Author: Justin Hileman (http://justinhileman.com)
#
# Installation:
#     Add the following function to your `.bashrc` or `.bash_profile`,
#     or save it somewhere (e.g. `~/.tab.bash`) and source it in `.bashrc`
#

guilgaly

val scalacOptions = Seq(
  "-encoding",
  "utf-8", // Specify character encoding used by source files.
  "-Ybackend-parallelism", //
  "8",
  "-explaintypes", // Explain type errors in more detail.
  "-feature", // Emit warning and location for usages of features that should be imported explicitly.
  "-unchecked", // Enable additional warnings where generated code depends on assumptions.
  "-Xcheckinit", // Wrap field accessors to throw an exception on uninitialized access.
  // "-Ymacro-annotations", // Enable support for macro annotations, formerly in macro paradise.