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@jpillora
jpillora / sshd.go
Last active Jun 27, 2020
Go SSH server complete example - Read more here https://blog.gopheracademy.com/go-and-ssh/
View sshd.go
// A small SSH daemon providing bash sessions
//
// Server:
// cd my/new/dir/
// #generate server keypair
// ssh-keygen -t rsa
// go get -v .
// go run sshd.go
//
// Client:
@Jaza
Jaza / Private-pypi-howto
Last active Jul 16, 2020
Guide for how to create a (minimal) private PyPI repo, just using Apache with directory autoindex, and pip with an extra index URL.
View run-kafka-container.md

Start Kafka service

The following commands will start a container with Kafka and Zookeeper running on mapped ports 2181 (Zookeeper) and 9092 (Kafka).

docker pull spotify/kafka
docker run -d -p 2181:2181 -p 9092:9092 --env ADVERTISED_HOST=kafka --env ADVERTISED_PORT=9092 --name kafka spotify/kafka

Why Spotify?

ADVERTISTED_HOST was set to kafka, which will allow other containers to be able to run Producers and Consumers.

@klovadis
klovadis / gist:5170446
Created Mar 15, 2013
Two Lua scripts for Redis to turn HGETALL and HMGET into dictionary tables
View gist:5170446
-- gets all fields from a hash as a dictionary
local hgetall = function (key)
local bulk = redis.call('HGETALL', key)
local result = {}
local nextkey
for i, v in ipairs(bulk) do
if i % 2 == 1 then
nextkey = v
else
result[nextkey] = v
@debrice
debrice / Flask-SQLAlchemy Caching.md
Last active Jul 23, 2020
Flask SQLAlchemy Caching
View Flask-SQLAlchemy Caching.md

Flask-SQLAlchemy Caching

The following gist is an extract of the article Flask-SQLAlchemy Caching. It allows automated simple cache query and invalidation of cache relations through event among other features.

Usage

retrieve one object

# pulling one User object
user = User.query.get(1)
@valyala
valyala / README.md
Last active Aug 6, 2020
Optimizing postgresql table for more than 100K inserts per second
View README.md

Optimizing postgresql table for more than 100K inserts per second

  • Create UNLOGGED table. This reduces the amount of data written to persistent storage by up to 2x.
  • Set WITH (autovacuum_enabled=false) on the table. This saves CPU time and IO bandwidth on useless vacuuming of the table (since we never DELETE or UPDATE the table).
  • Insert rows with COPY FROM STDIN. This is the fastest possible approach to insert rows into table.
  • Minimize the number of indexes in the table, since they slow down inserts. Usually an index on time timestamp with time zone is enough.
  • Add synchronous_commit = off to postgresql.conf.
  • Use table inheritance for fast removal of old data:
View tmux_cheatsheet.markdown

tmux cheatsheet

As configured in my dotfiles.

start new:

tmux

start new with session name:

@leonardofed
leonardofed / README.md
Last active Aug 7, 2020
A curated list of AWS resources to prepare for the AWS Certifications
View README.md


A curated list of AWS resources to prepare for the AWS Certifications

A curated list of awesome AWS resources you need to prepare for the all 5 AWS Certifications. This gist will include: open source repos, blogs & blogposts, ebooks, PDF, whitepapers, video courses, free lecture, slides, sample test and many other resources.


@hellerbarde
hellerbarde / latency.markdown
Created May 31, 2012 — forked from jboner/latency.txt
Latency numbers every programmer should know
View latency.markdown

Latency numbers every programmer should know

L1 cache reference ......................... 0.5 ns
Branch mispredict ............................ 5 ns
L2 cache reference ........................... 7 ns
Mutex lock/unlock ........................... 25 ns
Main memory reference ...................... 100 ns             
Compress 1K bytes with Zippy ............. 3,000 ns  =   3 µs
Send 2K bytes over 1 Gbps network ....... 20,000 ns  =  20 µs
SSD random read ........................ 150,000 ns  = 150 µs
Read 1 MB sequentially from memory ..... 250,000 ns  = 250 µs
View tmux-cheatsheet.markdown

tmux shortcuts & cheatsheet

start new:

tmux

start new with session name:

tmux new -s myname
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