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Aetherus /
Last active May 24, 2022
How to scale out a Phoenix application with websocket

How to scale out a Phoenix application with websocket


It's relatively easy to scale out stateless web applications. You often only need a reverse proxy. But for those stateful web applications, especially those applications that embeds websocket services in them, it's always a pain to distribute them in a cluster. The traditional way is introducing some external services like Redis to handle pubsub, however, in such way, you often need to change your code. Can Erlang/Elixir, the "concurrency oriented programming languages", best other languages in this use case? Has Phoenix framework already integrated the solution of horizontally scaling websocket? I'll do an experiment to prove (or disprove) that.


josevalim /
Last active Aug 9, 2022
A 1LOC bash script for re-running tests whenever a lib/ or test/ file changes keeping the same VM instance
# You will need fswatch installed (available in homebrew and friends)
# The command below will run tests and wait until fswatch writes something.
# The --stale flag will only run stale entries, it requires Elixir v1.3.
fswatch lib/ test/ | mix test --stale --listen-on-stdin
myronmarston / slash_vs_plus_string.rb
Last active May 20, 2016
Comparing perf of using `\` vs `+` for multiline strings
View slash_vs_plus_string.rb
require 'benchmark/ips'
require 'allocation_stats'
def access_slashed_string
"Lorem ipsum dolor sit amet, consectetur adipiscing elit. Duis molestie " \
"elementum urna, a accumsan nunc euismod et. Aliquam porttitor, leo in " \
"aliquet aliquam, magna quam venenatis nulla, vel sagittis nisi nisi et " \
"nulla. Nulla quis facilisis turpis, vel blandit risus. Maecenas ut ante " \
"quis velit pretium pharetra ac rhoncus massa. Nulla quam dui, placerat " \
"eget quam vel, ultricies eleifend sem."
kecebongsoft / gist:11312110
Created Apr 26, 2014
Bulk remove iTerm2 color schemes.
View gist:11312110
# There was a day where I have too many color schemes in iTerm2 and I want to remove them all.
# iTerm2 doesn't have "bulk remove" and it was literally painful to delete them one-by-one.
# iTerm2 save it's preference in ~/Library/Preferences/com.googlecode.iterm2.plist in a binary format
# What you need to do is basically copy that somewhere, convert to xml and remove color schemes in the xml files.
$ cd /tmp/
$ cp ~/Library/Preferences/com.googlecode.iterm2.plist .
$ plutil -convert xml1 com.googlecode.iterm2.plist
$ vi com.googlecode.iterm2.plist
willurd /
Last active Sep 30, 2022
Big list of http static server one-liners

Each of these commands will run an ad hoc http static server in your current (or specified) directory, available at http://localhost:8000. Use this power wisely.

Discussion on reddit.

Python 2.x

$ python -m SimpleHTTPServer 8000
bf4 /
Last active Jul 17, 2021
Some Ruby Learning Resources
AkashaCoin / gist:3430820
Created Aug 23, 2012
TheEmpath repping 4over with class
View gist:3430820
~ #node.js
[20.16.16] < TheEmpath> so
[20.16.34] < TheEmpath> anyone else have a hot programmer girl in their office? o____O
[20.16.42] < Lorentz> I wiiish
[20.16.48] <@Nexxy> not appropriate.
[20.16.57] »¡« Signoff caaakeeey: #Node.js (Ping timeout: 260 seconds)
[20.17.32] < joshwnj> yeah guys, grow up
[20.17.38] < jerrysv> Nexxy: olynode was fun, you should have gone
[20.18.03] < TheEmpath> my boss came by and said "Here, a new subodinate" and its a very attractive female. the otherwise painfully quite engineering room suddenly came to life and its a problem :X
jboner / latency.txt
Last active Sep 30, 2022
Latency Numbers Every Programmer Should Know
View latency.txt
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
coreyhaines / .rspec
Last active Apr 12, 2022
Active Record Spec Helper - Loading just active record
View .rspec
-I app
dchelimsky / output.txt
Created Mar 16, 2012
RSpec is not the reason your rails test suite is slow
View output.txt
[david: compare]$ # at this point we have a stock rails app with no minitest tests and one pending rspec example
[david: compare]$
[david: compare]$ time rake test
Run options:
# Running tests:
Finished tests in 0.030419s, 0.0000 tests/s, 0.0000 assertions/s.