wesley tanaka

Accessible Introduction to Software Transactional Memory (STM)


Fatal Error: Unable to find package java.lang in classpath or bootclasspath


This error: Fatal Error: Unable to find package java.lang in classpath or bootclasspath can occur when /usr/lib/jvm/default-java is missing

This can be worked around with:

cd /usr/lib/jvm
sudo ln -s java-8-oracle default-java

Terror Drone


A passenger plane struck a drone today.  It'll just be a matter of time until someone figures out how to program hundreds of drones to hit a plane.

Using Amazon Glacier as a cheap backup solution from the command line


Set up the bucket and lifecycle rules:

Using Docker in Mac OSX with VMWare Fusion and docker-machine


Although Docker uses Linux kernel features, it is possible to run docker containers in Mac OSX by installing a linux virtual machine and running the docker containers inside the virtual machine.

Create virtual machine called osxdocker:

docker-machine create --driver vmwarefusion osxdocker --vmwarefusion-memory-size=2048

Set environment variables to let the docker command line program connect to boot2docker

eval `docker-machine env osxdocker`

Run docker commands

How to catch up vmware clock to accurate time after a virtual machine pause/un-pause


When you pause a VMWare Fusion virtual machine on a Mac OSX host and resume it after a long time, your system clock will sometimes be behind. ntpd won't catch the clock up if it's too far behind. One manual solution is to run ntpdate in the guest operating system once the virtual machine unpauses:

sudo ntpdate pool.ntp.org

Another approach which I am currently trying, is to set your clocksource to use acpi_pm instead of tsc. You can check which clocksources you have available with:

Fast, Low Memory Drupal 6 System Module

A Drupal 5 version of this module is also available.  If you would like this patch to be committed to Drupal core, please do not leave a comment on this page—please instead add your comment to Drupal issue #455092.

This is a drop-in replacement for the system.module of Drupal 6.37 which makes your Drupal 6 site use less memory and may even make it faster. A test I ran in a development environment with a stock Drupal 6 installation suggested that I got:

Light Vader


I'm not the only one who heard it as "Dark Vader" during childhood.

. . .

R> What costume did you get?

W> Transformers

R> Is it an Autobot?    [NB: We don't have any exposure at home to Transformers; The things he learns from school!]

W> Yes

R> I like Autobots, and I like superheroes, and I like Star Wars best.  [NB: No real exposure to Star Wars either]

[a short time later in the car not too far away....]

Installing Ubuntu onto a NFS mount


It is possible to install Ubuntu onto a NFS networked filesystem directory, which you might want to do in order to boot that copy of Ubuntu over the network on a diskless thin client computer.

Set up the base filesystem:

Booting Ubuntu from a network filesystem


It is possible to boot Ubuntu over the network on a computer with no local hard drive. You need:

  • A DHCP server that supports PXE
  • A TFTP server with enough space to host the kernel binary
  • An NFS server with enough space to host the root filesystem

The steps involved are:

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by Wesley Tanaka