codefromthecrypt

I've had many people ask me questions about OpenTracing, often in relation to OpenZipkin. I've seen assertions about how it is vendor neutral and is the lock-in cure. This post is not a sanctioned, polished or otherwise muted view, rather what I personally think about what it is and is not, and what it helps and does not help with. Scroll to the very end if this is too long. Feel free to add a comment if I made any factual mistakes or you just want to add a comment.

So, what is OpenTracing?

OpenTracing is documentation and library interfaces for distributed tracing instrumentation. To be "OpenTracing" requires bundling its interfaces in your work, so that others can use it to time distributed operations with the same library.

So, who is it for?

OpenTracing interfaces are targeted to authors of instrumentation libraries, and those who want to collaborate with traces created by them. Ex something started a trace somewhere and I add a notable event to that trace. Structure logging was recently added to O

asvetlov

import asyncio


class CM:

    async def __aenter__(self):
        print(1)
        await asyncio.sleep(0.01)
        print(2)
        return self

GaelVaroquaux

'''
Non-parametric computation of entropy and mutual-information

Adapted by G Varoquaux for code created by R Brette, itself
from several papers (see in the code).

This code is maintained at https://github.com/mutualinfo/mutual_info 
Please download the latest code there, to have improvements and 
bug fixes.

staltz

The introduction to Reactive Programming you've been missing

(by @andrestaltz)

---

This tutorial as a series of videos

If you prefer to watch video tutorials with live-coding, then check out this series I recorded with the same contents as in this article: Egghead.io - Introduction to Reactive Programming.

---

mihkels

#!/bin/bash 

sudo apt-get update

# Now let's install all the required ubuntu packages
sudo apt-get install build-essential uwsgi nginx uwsgi-plugin-python python-pip

# PS! If you are doing this stuff for fun I do recommend to install nginx from PPA repository
# that you can find here https://launchpad.net/~nginx/+archive/development

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

alkavan

# I book marked some sites with useful Linux commands i found.
# then i noticed they were down, so i loaded them via google cache, and copied here.
# source: http://blog.urfix.com/
# source: http://www.pixelbeat.org/cmdline.html
# Enjoy!

# How to run process as background and never die
#
# nohup means: Do not terminate this process even when the stty is cut off.
# > /dev/null means: stdout goes to /dev/null (which is a dummy device that does not record any output).