(C-x means ctrl+x, M-x means alt+x)
The default prefix is C-b. If you (or your muscle memory) prefer C-a, you need to add this to ~/.tmux.conf
:
# ~/.bashrc: executed by bash(1) for non-login shells. | |
# see /usr/share/doc/bash/examples/startup-files (in the package bash-doc) | |
# for examples | |
# If not running interactively, don't do anything | |
[ -z "$PS1" ] && return | |
# don't put duplicate lines in the history. See bash(1) for more options | |
# ... or force ignoredups and ignorespace | |
HISTCONTROL=ignoredups:ignorespace |
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 |
echo -e "\e[1;40m" ; clear ; while :; do echo $LINES $COLUMNS $(( $RANDOM % $COLUMNS)) $(( $RANDOM % 72 )) ;sleep 0.05; done|awk '{ letters="abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789@#$%^&*()"; c=$4; letter=substr(letters,c,1);a[$3]=0;for (x in a) {o=a[x];a[x]=a[x]+1; printf "\033[%s;%sH\033[2;32m%s",o,x,letter; printf "\033[%s;%sH\033[1;37m%s\033[0;0H",a[x],x,letter;if (a[x] >= $1) { a[x]=0; } }}' |
#!/usr/bin/env python | |
"""An example of cursor dealing with prepared statements. | |
A cursor can be used as a regular one, but has also a prepare() statement. If | |
prepare() is called, execute() and executemany() can be used without query: in | |
this case the parameters are passed to the prepared statement. The functions | |
also execute the prepared statement if the query is the same prepared before. | |
Prepared statements aren't automatically deallocated when the cursor is | |
deleted, but are when the cursor is closed. For long-running sessions creating |
# | |
# Working with branches | |
# | |
# Get the current branch name (not so useful in itself, but used in | |
# other aliases) | |
branch-name = "!git rev-parse --abbrev-ref HEAD" | |
# Push the current branch to the remote "origin", and set it to track | |
# the upstream branch | |
publish = "!git push -u origin $(git branch-name)" |
import logging | |
import multiprocessing | |
import time | |
import mplog | |
FORMAT = '%(asctime)s - %(processName)s - %(levelname)s - %(message)s' | |
logging.basicConfig(level=logging.DEBUG, format=FORMAT) | |
existing_logger = logging.getLogger('x') |
#!/usr/bin/env python | |
import os | |
import itertools | |
import multiprocessing as mp | |
from math import ceil | |
from types import GeneratorType as generator | |
from functools import partial | |
from time import time | |
When hosting our web applications, we often have one public IP
address (i.e., an IP address visible to the outside world)
using which we want to host multiple web apps. For example, one
may wants to host three different web apps respectively for
example1.com
, example2.com
, and example1.com/images
on
the same machine using a single IP address.
How can we do that? Well, the good news is Internet browsers
# Note – this is not a bash script (some of the steps require reboot) | |
# I named it .sh just so Github does correct syntax highlighting. | |
# | |
# This is also available as an AMI in us-east-1 (virginia): ami-cf5028a5 | |
# | |
# The CUDA part is mostly based on this excellent blog post: | |
# http://tleyden.github.io/blog/2014/10/25/cuda-6-dot-5-on-aws-gpu-instance-running-ubuntu-14-dot-04/ | |
# Install various packages | |
sudo apt-get update |