miguelmota

knowledge dump on container runtimes

KataContainers
- image coupled with kernel 
- light vm layer
- can run in nested virturalization environments if hardware supports and you can enable it in bios (ex. only bare metal EC2 instances, limits many cloud providers)
- slower startup time
- OCI compliant
- previously known as ClearContainers by Intel

tayfie

How To Scrape Images from 4chan Using Wget

This guide is to save other sorry plebs from needing to RTFM in figuring out how to use wget to scrape images from 4chan and other imageboards. There are lots of image downloaders in existence, but they are usually outdated and broken. You will save time following this guide to learn how to use a powerful and general purpose tool instead.

What Is Wget?

Wget is a command-line file downloader that can handle just about any file downloading task normal and power users will ever need to do. It has versions available for Windows, Mac, and Linux. If it is not already installed on your machine, install it now.

Basic syntax

nazrulworld

Development Status :: 1 - Planning
Development Status :: 2 - Pre-Alpha
Development Status :: 3 - Alpha
Development Status :: 4 - Beta
Development Status :: 5 - Production/Stable
Development Status :: 6 - Mature
Development Status :: 7 - Inactive
Environment :: Console
Environment :: Console :: Curses
Environment :: Console :: Framebuffer

markusfisch

Bar charts from stdin

Put this shell script somewhere in your path and run it by feeding it value/label pairs like this:

$ bars
10 one
20 two
30 three

jhclark

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
Send 1K bytes over 1 Gbps network        10,000 ns    0.01 ms
Read 1 MB sequentially from memory      250,000 ns    0.25 ms
Round trip within same datacenter       500,000 ns    0.5  ms
Read 1 MB sequentially from SSD       1,000,000 ns    1    ms  4X memory

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