aphyr

Let:
  T1 = {:type :ok, :f :txn, :value [[:append 237 3] [:r 233 [1 3 5 6 7 8 9]] [:append 237 4] [:append 238 1]], :process 16, :time 207412818568, :index 4098}
  T2 = {:type :ok, :f :txn, :value [[:append 233 10] [:r 239 [1]] [:append 237 5]], :process 22, :time 206702615066, :index 4054}
  T3 = {:type :ok, :f :txn, :value [[:r 233 [1 3 5 6 7 8 9 10]] [:r 238 [2]] [:append 237 7] [:r 239 [1]]], :process 22, :time 206769955506, :index 4058}
  T4 = {:type :ok, :f :txn, :value [[:append 238 3] [:append 237 8]], :process 22, :time 206852651070, :index 4060}
  T5 = {:type :ok, :f :txn, :value [[:append 238 4] [:r 239 [1]] [:r 241 nil]], :process 22, :time 206919825209, :index 4064}
  T6 = {:type :ok, :f :txn, :value [[:r 238 [2 3 4]] [:append 239 2] [:append 241 1] [:append 239 3]], :process 22, :time 206984932481, :index 4068}
  T7 = {:type :ok, :f :txn, :value [[:r 241 [1 2 3]] [:r 239 [1 2 3]] [:append 238 6]], :process 22, :time 207330867948, :index 4090}

Then:

aphyr

aphyr@waterhouse ~> spotify --force-device-scale-factor=1.36
[0622/084744:ERROR:browser_main_loop.cc(203)] Running without the SUID sandbox! See https://code.google.com/p/chromium/wiki/LinuxSUIDSandboxDevelopment for more information on developing with the sandbox on.
[0622/084744:ERROR:main_delegate.cc(764)] Could not load cef_extensions.pak
[0622/084744:ERROR:main_delegate.cc(764)] Could not load cef_extensions.pak
13:47:45.490 I [dns.cpp:63                      ] resolved apresolve.spotify.com to 104.154.126.0
13:47:45.490 I [dns.cpp:63                      ] resolved apresolve.spotify.com to 194.68.30.66
13:47:45.490 I [dns.cpp:63                      ] resolved apresolve.spotify.com to 194.68.30.86
13:47:45.493 5 [playlist_be_pl4_context.cpp:70  ] [spotify:user:aphyr_null:rootlist] Creating context
13:47:45.493 5 [playlist_be_pl4_context.cpp:70  ] [spotify:user:aphyr_null:publishedrootlist] Creating context
13:47:45.513 D [gaia_manager.cpp:705            ] GAIA: TIMING(433337) GaiaManager::start, _servic

aphyr

Let:
  T1 = {:type :ok, :f :txn, :value [[:append 1 4] [:r 0 nil]], :process 3, :time 8230766125, :index 17}
  T2 = {:type :ok, :f :txn, :value [[:r 1 [2]] [:r 1 [2]] [:append 0 3]], :process 4, :time 8212723312, :index 15}

Then:
  - T1 < T2, because T1 observed the initial (nil) state of 0, which T2 created by appending 3.
  - However, T2 < T1, because T2 did not observe T1's append of 4 to 1: a contradiction!


Let:

aphyr

(let [r0 {:type :ok, :f :read, :value {:x 0, :y 0}  ; Initially, x and y are 0
      i1 {:type :ok, :f :inc, :value [:x]}          ; Increment key x by 1
      r1 {:type :ok, :f :read, :value {:x 1, :y 0}} ; Read x and y
      i2 {:type :ok, :f :inc, :value [:y]           ; Increment y
      r2 {:type :ok, :f :read, :value {:x 1, :y 1}} ; Read x and y
      ; So far, so good. The above set of txns is consistent with an order
      ; where i1 precedes i2. Now, let's have a read transaction which observed
      ; the *opposite* order of increments: i2 < i1.
      r3 {:type :ok, :f :read, :value {:x 0, :y 1}}

aphyr

class Libfaketime < Formula
  desc "Report faked system time to programs"
  homepage "https://github.com/wolfcw/libfaketime"
  url "https://github.com/wolfcw/libfaketime/archive/v0.9.7.tar.gz"
  sha256 "4d65f368b2d53ee2f93a25d5e9541ce27357f2b95e5e5afff210e0805042811e"
  revision 1
  head "https://github.com/wolfcw/libfaketime.git"

  bottle do
    rebuild 1

aphyr

(defn real-pmap-with-early-abort
  "Like real-pmap, but as soon as one thread throws an exception, all threads
  are interrupted, and the original exception is rethrown. This is particularly
  helpful when you want to do some all-or-nothing work, and the failure of any
  piece means the entire results are invalid--or if the crash of one thread
  could deadlock other threads."
  [f coll]
  (let [exception     (promise)
        thread-group  (ThreadGroup. "real-pmap-with-early-abort")
        results (vec (take n (repeatedly promise)))

aphyr

Some stuff off the top of my head:

Monitorama 2013:

http://vimeo.com/67181466

RICON East 2013:

https://www.youtube.com/watch?v=mxdpqr-loyA

aphyr

#!/bin/bash

# Args: input video file, start time in HH:MM:SS, duration in seconds, output
# gif file.

# Tmpdir
rm -rf /tmp/video2gif
mkdir /tmp/video2gif

mplayer -nosub -ao null -ss "$2" -endpos "$3" "$1" -vo jpeg:outdir=/tmp/video2gif:quality=100

aphyr

Hi S-------. I'm not an expert in performance benchmarking--I focus on 
correctness and safety--but I have a few pieces of advice here.

0. Pick multiple workloads that cover the gamut of behaviors in each DB.  
*Don't* choose a completely sharded workload for VoltDB. Don't choose a 
purely commutative workload for Cassandra. Cassandra's Paxos 
implementation is slow and a good benchmark will demonstrate 
that--however, it *doesn't* (I think?) require a global coordinator, 
which means it might *scale* better than a single-coordinator system 
like, say, VoltDB. Talk about those differences!

aphyr

On 09/16/2015 12:51 PM, Marinus van Aswegen wrote:

Thank you for being so open, these are important issues to discuss. I'm really not trying to offend you. Do you consider the Bible authoritative?

To be perfectly honest, I'm not sure what "The Bible" means. I mean, first we've got the question of canon, right? Which books? Do we include schismatic texts? How much of the early Judaic canon is admissible? The Book of Wisdom? The Greek or Coptic Apocalypses of Peter? The Sirach? 2 Esdras? The book of Mormon? Ruth? Revelation? Depending on who you'll