abodacs

import struct
import time

import numpy as np
from tornado.tcpserver import TCPServer
from tornado.tcpclient import TCPClient
from tornado.ioloop import IOLoop
from tornado import gen

abodacs

PROJECT LICENSE

This project was submitted by Lara Martín as part of the Nanodegree At Udacity.

As part of Udacity Honor code, your submissions must be your own work, hence
submitting this project as yours will cause you to break the Udacity Honor Code
and the suspension of your account.

Me, the author of the project, allow you to check the code as a reference, but if
you submit it, it's your own responsibility if you get expelled.

abodacs

System Design Cheatsheet

Picking the right architecture = Picking the right battles + Managing trade-offs

Basic Steps

1. Clarify and agree on the scope of the system

• User cases (description of sequences of events that, taken together, lead to a system doing something useful)
  • Who is going to use it?
  • How are they going to use it?

abodacs

intel_idle.max_cstate=0 idle=poll quiet cgroup_enable=memory crashkernel=256M intel_pstate=disable

[mysql]
default-character-set=utf8mb4
user = root
password = 123456
port = 3306
socket = /tmp/mysqld.sock
prompt="\u@\h \d>"
 

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Rules to write a better commit message

These are my preferences for a good commit message, feel free to fork this gist and add your own standards, or add comment here to share yours with the community.

1. Include only the files related to the feature you are implementing:

• Don't add any file that is not related to the main issue, you can make it in a separate commit.
• Separating files that not related is important in the revert cases.
• Revise the whole changes always before committing and make sure to mention each change you made in the message.

2. Commit subject should be concise and reflect the essence of the commit:

• Imagine the commit as an Email to the owner or your team mates.
• Subject in the first and main sentence of the commit, it should be concise and to the point.
• It shouldn't exceed 50 char.

abodacs

-- show running queries (pre 9.2)
SELECT procpid, age(clock_timestamp(), query_start), usename, current_query 
FROM pg_stat_activity 
WHERE current_query != '<IDLE>' AND current_query NOT ILIKE '%pg_stat_activity%' 
ORDER BY query_start desc;

-- show running queries (9.2)
SELECT pid, age(clock_timestamp(), query_start), usename, query 
FROM pg_stat_activity 
WHERE query != '<IDLE>' AND query NOT ILIKE '%pg_stat_activity%' 

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"""
Django ORM Optimization Tips

Caveats:
* Only use optimizations that obfuscate the code if you need to.
* Not all of these tips are hard and fast rules.
* Use your judgement to determine what improvements are appropriate for your code.
"""

# ---------------------------------------------------------------------------

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# to generate your dhparam.pem file, run in the terminal
openssl dhparam -out /etc/nginx/ssl/dhparam.pem 2048

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/* Useful celery config.

app = Celery('tasks',
             broker='redis://localhost:6379',
             backend='redis://localhost:6379')

app.conf.update(
    CELERY_TASK_RESULT_EXPIRES=3600,
    CELERY_QUEUES=(
        Queue('default', routing_key='tasks.#'),

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Celery

Configuring your Django project to use Celery http://celeryq.org/docs/django-celery/getting-started/first-steps-with-django.html

Run the worker server in the foreground, so we can see what’s going on without consulting the logfile:

$ python manage.py celeryd -l info