mrflip

Max Battery Life Checklist

Here is a checklist to follow if you want maximum battery life -- for instance if you're about to get on a long plane flight.

Low power use checklist

With power connected:

mperham

# This works for me in 1.9.3-p125 but not in p194.
# Can anyone explain why?

        require 'net/http'
        http = Net::HTTP.new("theclymb1.campfirenow.com", 443)
        http.use_ssl = true
        http.verify_mode = OpenSSL::SSL::VERIFY_PEER
        request = Net::HTTP::Get.new("/login")
        response = http.request(request)
        raise response.inspect if response.code != '200'

scy

Opening and closing an SSH tunnel in a shell script the smart way

I recently had the following problem:

• From an unattended shell script (called by Jenkins), run a command-line tool that accesses the MySQL database on another host.
• That tool doesn't know that the database is on another host, plus the MySQL port on that host is firewalled and not accessible from other machines.

We didn't want to open the MySQL port to the network, but it's possible to SSH from the Jenkins machine to the MySQL machine. So, basically you would do something like

ssh -L 3306:localhost:3306 remotehost

csfrancis

# Updated for Ruby 2.3
string_t = None

def get_rstring(addr):
  s = addr.cast(string_t.pointer())
  if s['basic']['flags'] & (1 << 13):
    return s['as']['heap']['ptr'].string()
  else:
    return s['as']['ary'].string()

mperham

> pp ENV.select {|x| x =~ /^RUBY/ }
{"RUBY_GC_HEAP_GROWTH_FACTOR"=>"1.3",
 "RUBY_GC_HEAP_OLDOBJECT_LIMIT_FACTOR"=>"1.3",
 "RUBY_GC_HEAP_INIT_SLOTS"=>"600000",
 "RUBY_GC_MALLOC_LIMIT"=>"90000000",
 "RUBYOPT"=>"-rbundler/setup",
 "RUBYLIB"=>
  "/usr/local/rbenv/versions/2.1.2/lib/ruby/gems/2.1.0/gems/bundler-1.6.2/lib"}

jonleighton

# This pattern avoids serializing a large object (the Task) to Redis, whilst
# avoiding passing a low-level data type (the id) into the constructor.
# You might choose to call TaskJob.new(task) directly elsewhere (e.g. tests)

class TaskJob
  def self.perform(id)
    new(Task.find(id)).perform
  end

  def initialize(task)

six7zero9

import httplib2
import argparse
import json
import mysql.connector
import time
import sys
import itertools

from joblib import Parallel, delayed
from apiclient.discovery import build