Adrien Rey-Jarthon jarthod

## compressed_hash.rb
require 'zstd-ruby'

class CompressedHash < Hash
  DICTIONARY = IO.read('config/dictionaries/1')
  def mongoize
    if size > 0 # only compress non-empty hash
      # BSON::Binary.new(Zstd.compress(self.to_bson.to_s))
      BSON::Binary.new(Zstd.compress_using_dict(self.to_bson.to_s, DICTIONARY))
    else
      self

## browser-mockup.png

      
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                jarthod
                / browser-mockup.png
            
            
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              October 31, 2022 09:23
            
              
                Pure CSS browser mockups
              
          
## backup.md

      
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                jarthod
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              December 28, 2022 14:07
            
              
                Linux backup cheat sheet
              
          
    Prepare (Ubuntu 22.04 Live):
sudo su
apt install pv

Dump disk (or partition) to local file
zstd < /dev/nvme0n1 | pv > laptop.img.zst

Dump disk (or partition) to compressed image over network (NAS)

  
## ffmpeg_cheat_sheet.md

      
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              December 28, 2023 16:36
            
              
                ffmpeg cheat sheet
              
          
    base encode to H265 (HEVC)
ffmpeg -i in.mts -c:a copy -c:v libx265 out.mp4

base encode to H264
ffmpeg -i in.mts -c:a copy -c:v h264 out.mp4

base encode to AV1 (lower cpu-used = slower)

  
## server_benchmark.md

      
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                / server_benchmark.md
            
            
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              January 6, 2024 10:05
            
              
                Server benchmark
              
          
    Results


Server
Price*
CPU (1 thread)
CPU (4 threads)
IO


Scaleway Start1-XS
Atom C3955, 25G NVMe
$4
21 sec
P₉₅ = 2.1ms
21 sec
P₉₅ = 14ms
🚗 653 IO/s, 10 Mb/sec
P₉₅ = 0.40ms


Scaleway VC1-S
Atom C2750, 50G SSD
$4
46 sec ⚠️
P₉₅ = 4.6ms
23 sec
P₉₅ = 14ms
🚲 289 IO/s, 4.5 Mb/sec
P₉₅ = 0.39ms


Hetzner CPX11
AMD EPYC, 40G SSD
$5
20 sec
P₉₅ = 3.2ms
9.6 sec
P₉₅ = 11ms
✈️ 3656 IO/s, 57 Mb/sec
P₉₅ = 0.29ms


Hetzner CX21
Intel Xeon, 40G SSD
$6
24 sec
P₉₅ = 2.8ms
12.5 sec
P₉₅ = 11ms
🚤 1946 IO/s, 30 Mb/sec
P₉₅ = 0.97ms


AWS t2.micro 1G*Intel E5-2676 v3 2.4
	require 'zstd-ruby'

	class CompressedHash < Hash
	DICTIONARY = IO.read('config/dictionaries/1')
	def mongoize
	if size > 0 # only compress non-empty hash
	# BSON::Binary.new(Zstd.compress(self.to_bson.to_s))
	BSON::Binary.new(Zstd.compress_using_dict(self.to_bson.to_s, DICTIONARY))
	else
	self
Server	Price*	CPU (1 thread)	CPU (4 threads)	IO
Scaleway Start1-XS Atom C3955, 25G NVMe	$4	21 sec P₉₅ = 2.1ms	21 sec P₉₅ = 14ms	🚗 653 IO/s, 10 Mb/sec P₉₅ = 0.40ms
Scaleway VC1-S Atom C2750, 50G SSD	$4	46 sec ⚠️ P₉₅ = 4.6ms	23 sec P₉₅ = 14ms	🚲 289 IO/s, 4.5 Mb/sec P₉₅ = 0.39ms
Hetzner CPX11 AMD EPYC, 40G SSD	$5	20 sec P₉₅ = 3.2ms	9.6 sec P₉₅ = 11ms	✈️ 3656 IO/s, 57 Mb/sec P₉₅ = 0.29ms
Hetzner CX21 Intel Xeon, 40G SSD	$6	24 sec P₉₅ = 2.8ms	12.5 sec P₉₅ = 11ms	🚤 1946 IO/s, 30 Mb/sec P₉₅ = 0.97ms
AWS t2.micro 1G*Intel E5-2676 v3 2.4