Our professor in operating system lecture, topic: multiprocessing, today: "Just kill all children".

CEO - So... We'll have a new side project, it's a small thing, I spoke with a guy, he needs just a small thing...
Me - Ok....... So, what do you need me for?
CEO - Not much, this guy started a project but wants your help on a small part, and you already did something similar for us, so it should be fast, just copy and paste and change a little bit. You probably know better than me.
Me - *Sigh* ... So `friend`, what do you need from me?
Friend - So, I made a crawler that is storing some information on a local file, I just need to add multiprocessing and multithreading, a producer-consumer system with a queue so I can automatically add new links every now and then, a failback system, so when a process doesn't finish, it should be re-queued and crawled later, store all the information on a database cluster (that is not set up), [......]
Me - And when is this supposed to be up and running?
Friend - Your CEO told me you could do this by the weekend. Can we finish this by Friday?
Me - *facepalm* FML

Rant:
I am at work, some one says to me this system we are working on is multi threaded. I tell the no its not multi threaded and in this context. Things cannot happen concurrently. Its a single core arm 7tdmi. Arguments ensue abot the difference between multithread multitasking an multiprocessing. I proceed to explain this is a multitasking interrupt driven system. With no context switching or memory segmentation so one heap for all tasks cause thats how we have it configured and there is only one core. So there is no way the error he just described could possibly happen. Then he tells me im wrong but refuses to even look at the processor manual and rejects the Wikipedia entry for multithreading. So I plan on calling off so i can just have the next two weeks off while he trys to figure out why two things ar happening at once on this system. He deserves all the frustration that is to follow.

Fullstack Bluetooth in the cloud using a mainframe matrix and heatsinks for optimal parallel multiprocessing.

I hate buzzwords. And especially hate TV shows that try to sound smart.

Spend more time in multiprocessing, parallel computing

<opinion>
You may be a prod ninja but I believe that every dev should have a decent level of exposure with a low level language(s). Sure you can make an HTTP server, do a sentimental analysis, topic modeling, set up multinode clusters, write ORM queries from dbs and all sorts of awesome stuffs with Python/Ruby/PHP/JS/GO etc but none of them teaches you what happens at kernel level. Things like memory leaks, threading, multiprocessing, memory allocations etc can only be better learnt from a low level language.
</opinion>

P.S. Not a C/C++ fanboy. I'm a python dev 😄

It's always so funny when a person starts using multiprocessing in Python, because if there's "multi", obviously THIS is the thing that should free the person from a headache of having GUI frozen. You know, because it does "multiple" ehm... stuff..... at once....... yeah. And it's popular, it must work for me too! Oh how often I see this. :D

Stupidly enough that's not entirely a user's fault, but Python's as naming things with "multi" doesn't end up well basically with anything. I bet if there was such thing as multipointer in C half of the beginners would be totally fucked and the other one would just break their machines beyond repair with a joy.

Yet... reading the damn documentation should be a requirement before using threading or multiprocessing to prevent the confusion, because there's this funny difference between multiple threads and multiple processes which will haunt you unless you see what's what and use it correctly.

The GIL sucks.

"Just use a non-GIL implementation!"

Which? The one stuck on 3.4 or the one stuck on 2.7?

"Just use multiprocessing!"

Just hit a nail in with a pile driver!

Not sure if many people heard about nltk in python but I'm currently using a lot now for research.

So one day I was doing multiprocessing while using lemmatizer in nltk, for those who don't know, lemmatizer is a thing that change the word to its base form. So it is like, ran to run, bitches to bitch.

Anyway, the nltk package, to ensure it does not take too much memory, here's what it does: it loads a data file, and once it is loaded and accessed for the first time, it breaks the data file into CSV file. And since I was doing multiprocessing, the data file is accessed for multiple time while it can only be loaded once, hence error happened.

Instead of changing my code, which I think is good already, I went to the package directory of nltk and directly changed the source code from there and now the code works perfectly.

I'm very proud of my self at the moment, this is a very good lesson that I've learned: always look for alternatives. And suck it, nltk.

I wanted to install Firefox developer edition mainly because of multiprocessing
Now as I activated syncing, it synced my addons, after I restarted multiprocessing was disabled and greyed out
So i began to test which addon it was, deleting the contents of its profile each time

After half an hour I finally tried restarting without any addons, it was fucking disabled

Just using Firefox disables multiprocessing? Wtf?!

All I wanted was a logger and a counter... that’s it... but multiprocessing in python just has to go and fuck everything up...