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@jboner
jboner / latency.txt
Last active November 19, 2024 14:58
Latency Numbers Every Programmer Should Know
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
@ryin
ryin / tmux_local_install.sh
Last active October 2, 2024 14:23
bash script for installing tmux without root access
#!/bin/bash
# Script for installing tmux on systems where you don't have root access.
# tmux will be installed in $HOME/local/bin.
# It's assumed that wget and a C/C++ compiler are installed.
# exit on error
set -e
TMUX_VERSION=1.8
@akorobov
akorobov / ipv6-httpd.py
Created December 11, 2013 00:58
quick ipv6 http server using python's SimpleHttpServer
import socket
from BaseHTTPServer import HTTPServer
from SimpleHTTPServer import SimpleHTTPRequestHandler
class MyHandler(SimpleHTTPRequestHandler):
def do_GET(self):
if self.path == '/ip':
self.send_response(200)
self.send_header('Content-type', 'text/html')
self.end_headers()
Tmux is a "terminal multiplexer", it enables a number of terminals to be accessed and controlled from a single terminal.
If you use Debian/Ubuntu, you can just run apt-get install tmux, and voila.
Since the title was about centos 7, then do the following step to install tmux.
(1). tmux has a library dependency on libevent which, of course, isn’t installed by default.
$ wget https://github.com/downloads/libevent/libevent/libevent-2.0.21-stable.tar.gz
$ tar xzvf libevent-2.0.21-stable.tar.gz
$ cd libevent-2.0.21-stable
$ ./configure && make
@guyskk
guyskk / shadowsocks-server.service
Last active January 30, 2024 05:18
shadowsocks server systemd service
[Unit]
Description=Shadowsocks Server
After=network.target
[Service]
ExecStart=/usr/local/bin/ssserver -c /etc/shadowsocks/ss-config.json
Restart=on-abort
[Install]
WantedBy=multi-user.target
@rikumi
rikumi / iconsur.sh
Last active October 24, 2023 06:46
My personal iconsur setup
# See https://github.com/rikumi/iconsur
yarn global add iconsur
sudo iconsur set /Applications/Android\ File\ Transfer.app -k Airdroid
sudo iconsur set /Applications/Android\ Studio.app/ -l -c 7a5 -s 0.8
sudo iconsur set /Applications/DaisyDisk.app/ -l
sudo iconsur set /Applications/Decompressor.app/ -l
sudo iconsur set /Applications/Discord.app/
sudo iconsur set /Applications/Google\ Chrome.app/
sudo iconsur set /Applications/IINA.app/ -l -c 161d22