umputun

#!/bin/sh

# @raycast.schemaVersion 1
# @raycast.title Summarize Safari page
# @raycast.mode fullOutput
#
# Optional parameters:
# @raycast.icon ✨
#
# @raycast.packageName Things

headius

Algorithm

1. A secret byte you want to read is stored at inaccessible memory location priv_mem.
2. The sender triggers an access exception by attempting to read priv_mem.
3. Due to CPU optimization (out-of-order execution), the load of secret from priv_mem and the use of its value in (4) and (5) below may execute before the exception is triggered.
4. Calculate an offset into a known array probe by multiplying secret by the width of a cache line (or whatever block size the CPU typically fetches, like a 4096-byte page). This guarantees each of those 256 possible offsets will cache separately.
5. Load probe[offset], which causes the CPU to cache exactly one chunk of of our array, populating one cache line.
6. The exception finally triggers, clearing the modified registers...but cached data is not excised.
7. Iterate over all 256 offsets into probe to find out which one loads fast. You've determined the value of secret.

djspiewak

Thread Pools

Thread pools on the JVM should usually be divided into the following three categories:

1. CPU-bound
2. Blocking IO
3. Non-blocking IO polling

Each of these categories has a different optimal configuration and usage pattern.

namiazad

package derivation

import java.util.Locale

import shapeless._

import scala.reflect.ClassTag
import scala.util.Try

sealed trait Utensil

djspiewak

Introduction to scalaz-stream

Every application ever written can be viewed as some sort of transformation on data. Data can come from different sources, such as a network or a file or user input or the Large Hadron Collider. It can come from many sources all at once to be merged and aggregated in interesting ways, and it can be produced into many different output sinks, such as a network or files or graphical user interfaces. You might produce your output all at once, as a big data dump at the end of the world (right before your program shuts down), or you might produce it more incrementally. Every application fits into this model.

The scalaz-stream project is an attempt to make it easy to construct, test and scale programs that fit within this model (which is to say, everything). It does this by providing an abstraction around a "stream" of data, which is really just this notion of some number of data being sequentially pulled out of some unspecified data source. On top of this abstraction, sca

ryanlecompte

// Magnet pattern documented here: http://spray.io/blog/2012-12-13-the-magnet-pattern/

object TypeclassExample {
  // first, define the typeclass
  trait Plotter[A] {
    def plot: Unit
  }

  // this typeclass instance knows how to plot collections
  class IterablePlotter[A: Numeric](it: Iterable[A]) extends Plotter[Iterable[A]] {

acolyer

Internet Scale Services Checklist

A checklist for designing and developing internet scale services, inspired by James Hamilton's 2007 paper "On Desgining and Deploying Internet-Scale Services."

• http://mvdirona.com/jrh/talksandpapers/jamesrh_lisa.pdf

Basic tenets

• Does the design expect failures to happen regularly and handle them gracefully?
• Have we kept things as simple as possible?

cbschuld

#!/bin/sh

 yum update -y
 yum install -y wget git
 wget "http://www.haproxy.org/download/1.5/src/haproxy-1.5.6.tar.gz"
 yum groupinstall -y 'Development Tools'
 yum install -y openssl-devel
 yum install -y rpmdevtools pcre-devel
 rpmdev-setuptree 
 mv haproxy-1.5.6.tar.gz ~/rpmbuild/SOURCES/

viktorklang

#!/usr/bin/env zsh

# in fino veritas
 
# Borrowing shamelessly from these oh-my-zsh themes:
#   fino-time
#   pure
#   https://gist.github.com/smileart/3750104

# Set required options

pjobson

Removal of McAfee from OSX

Note: This was written in 2015, it may be out of date now.

There are a lot of commands here which I use sudo if you don't know what you're doing with sudo, especially where I rm you can severely screw up your system.

There are many reasons which you would want to remove a piece of software such as McAfee, such as not wanting it to hammer your CPU during work hours which seems like primetime for a virus scan.

I intend this to be a living document, I have included suggestions from peoples' replies.