run postgresql with systemctl
sudo pacman -S postgresql
find version & build from source
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
http://apassant.net/2012/01/16/timeout-for-html5-localstorage/ | |
var hours = 24; // Reset when storage is more than 24hours | |
var now = new Date().getTime(); | |
var setupTime = localStorage.getItem('setupTime'); | |
if (setupTime == null) { | |
localStorage.setItem('setupTime', now) | |
} else { | |
if(now-setupTime > hours*60*60*1000) { | |
localStorage.clear() |
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 |
{"ALL":["Africa/Abidjan","Africa/Accra","Africa/Addis_Ababa","Africa/Algiers","Africa/Asmara","Africa/Asmera","Africa/Bamako","Africa/Bangui","Africa/Banjul","Africa/Bissau","Africa/Blantyre","Africa/Brazzaville","Africa/Bujumbura","Africa/Cairo","Africa/Casablanca","Africa/Ceuta","Africa/Conakry","Africa/Dakar","Africa/Dar_es_Salaam","Africa/Djibouti","Africa/Douala","Africa/El_Aaiun","Africa/Freetown","Africa/Gaborone","Africa/Harare","Africa/Johannesburg","Africa/Juba","Africa/Kampala","Africa/Khartoum","Africa/Kigali","Africa/Kinshasa","Africa/Lagos","Africa/Libreville","Africa/Lome","Africa/Luanda","Africa/Lubumbashi","Africa/Lusaka","Africa/Malabo","Africa/Maputo","Africa/Maseru","Africa/Mbabane","Africa/Mogadishu","Africa/Monrovia","Africa/Nairobi","Africa/Ndjamena","Africa/Niamey","Africa/Nouakchott","Africa/Ouagadougou","Africa/Porto-Novo","Africa/Sao_Tome","Africa/Timbuktu","Africa/Tripoli","Africa/Tunis","Africa/Windhoek","America/Adak","America/Anchorage","America/Anguilla","America/Antigua","Amer |
# .bashrc essentials | |
# copy and paste any parts that you need into your own ~/.bashrc | |
# you may get a nicer one by default from your *nix distro; uncomment this | |
# only if you have an ugly default "bash-x.y$" prompt string | |
#PROMPT="[\u@\h:\w]$ " | |
# trim the display of '\w' to just the last three path elements | |
PROMPT_DIRTRIM=3 |
#!/bin/bash | |
# Automatic interactive installer for mtproto proxy https://github.com/seriyps/mtproto_proxy | |
# Supported OS: | |
# - Ubuntu 18.xx | |
# - Ubuntu 19.xx | |
# - Ubuntu 20.xx | |
# - Ubuntu 21.xx | |
# - Ubuntu 22.xx | |
# - Debian 11 bullseye | |
# - Debian 10 buster |
<head> | |
<meta property="og:image" content="GifToEmbedURL"> # Change the content to the link of a gif of your choice, which will be shown as the embed. | |
<meta property="og:type" content="video.other"> | |
<meta property="og:video:url" content="VideoToEmbedURL"> # Change the content to the link of a video of your choice. Will work with videos over 50 MB, and even unsupported codecs such as AV1! | |
<meta property="og:video:width" content="1920"> # Set this to the video's width and height, not required, but will show the video as intended if the aspect ratio and size is correct. | |
<meta property="og:video:height" content="1080"> | |
</head> |