cgthayer

Level 1

sudo apt update
sudo apt get net-tools  # netstat

Level 2

cgthayer

Goland

What	Keys
Back/forward	C-Alt-- +

cgthayer

Stevey's Google Platforms Rant

I was at Amazon for about six and a half years, and now I've been at Google for that long. One thing that struck me immediately about the two companies -- an impression that has been reinforced almost daily -- is that Amazon does everything wrong, and Google does everything right. Sure, it's a sweeping generalization, but a surprisingly accurate one. It's pretty crazy. There are probably a hundred or even two hundred different ways you can compare the two companies, and Google is superior in all but three of them, if I recall correctly. I actually did a spreadsheet at one point but Legal wouldn't let me show it to anyone, even though recruiting loved it.

I mean, just to give you a very brief taste: Amazon's recruiting process is fundamentally flawed by having teams hire for themselves, so their hiring bar is incredibly inconsistent across teams, despite various efforts they've made to level it out. And their operations are a mess; they don't real

cgthayer

#!/bin/bash -
#
# env-pkg: Environment Packager -- super simple, see Usage below
#
# by: Charles Thayer <thayer@mediabridge.com>

cd $HOME
ENVPKG_RSH=${ENVPKG_RSH:-ssh}

ENVDIR=env-pkg

cgthayer

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

cgthayer

$ python manage.py migrate
Operations to perform:
 Apply all migrations: admin, auth, contenttypes, sessions
Running migrations:
 Applying contenttypes.0001_initial… OK
 Applying auth.0001_initial… OK
 Applying admin.0001_initial… OK
 Applying admin.0002_logentry_remove_auto_add… OK
 Applying contenttypes.0002_remove_content_type_name… OK
 Applying auth.0002_alter_permission_name_max_length… OK

cgthayer

$ pip install django
$ django-admin startproject myproj
$ cd myproj
$ django-admin startapp myapp
$ export DJANGO_SETTINGS_MODULE=myproj.settings
$ django-admin runserver
Performing system checks…
System check identified no issues (0 silenced).
February 11, 2020–05:12:45
Django version 1.11.9, using settings 'myproj.settings'

cgthayer

s = """Gur Mra bs Clguba, ol Gvz Crgref

Ornhgvshy vf orggre guna htyl.
Rkcyvpvg vf orggre guna vzcyvpvg.
Fvzcyr vf orggre guna pbzcyrk.
Pbzcyrk vf orggre guna pbzcyvpngrq.
Syng vf orggre guna arfgrq.
Fcnefr vf orggre guna qrafr.
Ernqnovyvgl pbhagf.
Fcrpvny pnfrf nera'g fcrpvny rabhtu gb oernx gur ehyrf.

cgthayer

Django DRF Cheat Sheet

Django Rest Framework

Overview:

    http request --> url_route --> view --> serializer --> data-dict response

cgthayer

>>> from django.db import transaction
>>> transaction.set_autocommit(autocommit=False)
>>> o = Organization_v2.objects.get(name='pdemo')
>>> del_info = o.delete()
>>> del_info
(1404, {'data.Property': 408, [..more stuff..], 'data.Organization_v2': 1})
>>> Property.objects.filter(scope__organization_id=o).count()
0
>>> transaction.rollback()
>>> o = Organization_v2.objects.get(name='pdemo')