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GCC compiler optimization for ARM-based systems

2017-03-03 fm4dd

The gcc compiler can optimize code by taking advantage of CPU specific features. Especially for ARM CPU's, this can have impact on application performance. ARM CPU's, even under the same architecture, could be implemented with different versions of floating point units (FPU). Utilizing full FPU potential improves performance of heavier operating systems such as full Linux distributions.

-mcpu, -march: Defining the CPU type and architecture

These flags can both be used to set the CPU type. Setting one or the other is sufficient.

hostmaster

# dict key tranformation table 
_ssh_to_ansible = {
    'user': 'ansible_ssh_user',
    'hostname': 'ansible_ssh_host',
    'identityfile': 'ansible_ssh_private_key_file',
    'port': 'ansible_ssh_port'
}

# host_config = config.lookup(box_name) # dict 
temp = {}

hostmaster

#!/bin/bash

# Setting this, so the repo does not need to be given on the commandline:
export BORG_REPO='*******'

# Setting this, so you won't be asked for your repository passphrase:
export BORG_PASSPHRASE='*******'

# some helpers and error handling:
function info  () { echo -e "\n"`date` $@"\n" >&2; }

hostmaster

# {{ ansible_managed }}
{% for key in pub_keys.results %}
{{ key.stdout }}
{% endfor %}

hostmaster

location ^~ /attachments/download_zip/ {
  proxy_pass         http://mongrel;
  proxy_redirect     off;
  proxy_set_header   Host               $host;
  proxy_set_header   X-Real-IP          $remote_addr;
  proxy_set_header   X-Forwarded-For    $proxy_add_x_forwarded_for;
  proxy_set_header   X_Forwarded_Proto  $scheme;
  proxy_read_timeout 120;
  proxy_connect_timeout 120;
  post_action @notify_zip

hostmaster

Live stream Xiaomi Ants Smart Camera via FFMPEG

This assumes you have a Xiaomi Ants Smart Camera that still has the open RTSP enabled. I think newer firmware might remove this capability. If you Google enough you can find instructions on how to downgrade.

FFMPEG

FFMPEG is where most of the magic happens. I use OSX and as such am a fan of using Homebrew to install free software. Here is my ffmpeg install command:

brew install ffmpeg --with-faac --with-fdk-aac --with-ffplay --with-fontconfig --with-freetype --with-frei0r --with-libass --with-libbluray --with-libcaca --with-libquvi --with-libsoxr --with-libssh --with-libvidstab --with-libvorbis --with-libvpx --with-opencore-amr --with-openjpeg --with-openssl --with-opus --with-rtmpdump --with-schroedinger --with-speex --with-theora --with-tools --with-webp --with-x265

hostmaster

#!/bin/bash

URL=http://www.mythic-beasts.com/cgi-bin/job.pl

curl -s ${URL} | 
	gawk '
	/Evaluate/ { 
		gsub (/([[:alpha:]]|[[:space:]]|[,.<>/])/,"", $0); 
		print $0 |& "bc"; 
		"bc" |& getline res; 

hostmaster

- name: Install wget package (Debian based)
  action: apt pkg='wget' state=installed
  only_if: "'$ansible_pkg_mgr' == 'apt'"

 

- name: Install wget package (RedHat based)
  action: yum name='wget' state=installed
  only_if: "'$ansible_pkg_mgr' == 'yum'"

hostmaster

#!/bin/bash
set -eo pipefail

TOKEN=${GITHUB_TOKEN:?environment variable is empty or unset}

[ -n "$1" ] && GITHUB_REPOSITORY=$1

GITHUB_REPOSITORY=${GITHUB_REPOSITORY:? please provide a name of a repository}

OWNER=$(echo $GITHUB_REPOSITORY | cut -d/ -f1)

hostmaster

$ redis-cli -eval Redis_queue.lua