DanyWallace

I am passionate about Ruby, but its execution time compared to other languages is extremely high, especially when we want to use more complex algorithms. In general, data structures in interpreted languages become incredibly slow compared to compiled languages. Some algorithms such as ´n-body´ and ´fannkuch-redux´ can be up to 30 times slower in Ruby than Go. This is one of the reasons I was interested in embedding Go code in a Ruby environment.

For those who do not know how shared libraries operate, they work in a similar way as DLLs in Windows. However, they have a native code with a direct interface to the C compiler.

Note Windows uses the DLL system, and in this case, this does not necessarily have to be in native code.

One example is DLLs written in C#, which runs on a virtual machine. Because I do not use windows, I ended up not testing if it is poss

DanyWallace

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

DanyWallace

!! euphrasia v2 by bohoomil

! euphrasia fg/bg
URxvt*background:  #090C19
URxvt*foreground:  #E6E6E6
URxvt*cursorColor: #1AAA13

! X.org apps bg/fg
*background: #D0CECB
*foreground: #090C19

DanyWallace

#!/usr/bin/env ruby
require 'uri'
require 'httparty'

# Download mp3 files from SoundCloud
# Usage:
#   ./soundcloud.rb https://soundcloud.com/tara-tiba/paeez_tara-tiba
class SoundCloud
  include HTTParty
  base_uri 'https://soundcloud.com'