Whoa. Can’t wait to get my hands on one of these.

 David F. Bacon, Perry Cheng, and V.T. Rajan, A Real-time Garbage Collector with Low Overhead and Consistent Utilization. Conference Record of the Thirtieth ACM Symposium on Principles of Programming Languages (New Orleans, Louisiana, January 2003), pp. 285-298.  PDF
This is the canonical paper which describes the Metronome garbage collection algorithm, analysis, and implementation.

 David F. Bacon, Real-time Garbage Collection. ACM Queue, volume 5 issue 1 (February 2007), pp. 40-49.  PDF
This is a more accessible but less detailed description of the Metronome technology

David F. Bacon, Perry Cheng, David Grove, Michael Hind, V.T. Rajan, Eran Yahav, Matthias Hauswirth, Christoph Kirsch, Daniel Spoonhower, and Martin T. Vechev, High-level Real-time Programming in Java. Proceedings of the Fifth ACM International Conference on Embedded Software (Jersey City, New Jersey, September 2005), pp. 68-78. PDF

Daniel Frampton, David F. Bacon, Perry Cheng, and David Grove, –> Generational Real-time Garbage Collection: A Three Part Invention for Young Objects –>. Proceedings of the Twenty-First European Conference on Object-Oriented Programming, (Berlin, Germany, July 2007), Lecture Notes in Computer Science (to appear).  PDF –>

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Summary: 64 abstracts with links to the full papers and reader comments.

Good stuff on here.

Very cool stuff! I’m using Bootstrap for a project I’m working on now and I can also say its very quick to get up a nice looking site without a lot of hassle.

During our recent checkout study we found several usability issues when using a drop-down for your country selector: a lack of overview, unclear sorting, scrolling issues, inconsistent UIs, a lack of context on mobile devices, and finally, they break the user’s tab-flow.

So we took it upon ourselves to redesign the country selector.

Wow, this is really nice!

Table of Contents

Preface

1. Overview

Monolithic Kernels

Microkernel-Based Systems

Historic Attempts

Basic Abstractions and Mechanisms

2. Threads and Thread Switching

Threads

Switching Threads

Kernel Stack Models

Per-Processor Kernel Stack

Per-Thread Kernel Stack

Sample Code

3. System Calls

Traditional System Calls on x86

Fast System Calls on x86

Reconciling Stack Layouts

Returning From System Calls

4. TCBs

Locating TCBs

Locating the TCB of the Current Thread

Locating the TCB of a Thread by Thread ID

Locating the TCB of the Next Ready-to-Run Thread

0-Mapping-Trick

Address Space Layout

Address Space Regions

Regions in the Kernel Address Space

Synchronization of the Kernel Address Space

Processor-Specific Data

5. IPC Functionality and Interface

Synchronous Communication

Communication Primitives

Message Types

Timeouts

Send Timeout

Receive Timeout

Transfer Timeout

Timeout Encoding

Encoding of IPC Parameters

Operation and Addresses

Deceiving IPC and Proxies

Timeouts

Message Content

Receive Buffers

IPC Result

Virtual Registers and the UTCB

6. IPC Implementation

IPC and Scheduling

General Implementation of Short IPC

Fast Path IPC

Performance Considerations

Combining Fast and Slow Paths

Long IPC

String IPC

Copy In/Copy Out

Temporary Mapping Area

Management of the Temporary Mapping Area

Temporary Mapping Area on Multi-Processor Machines

7. Dispatching

Scheduling in L4

Optimizations

Dispatching Mechanism

Lazy Dispatching

Timeouts

8. Virtual Memory Mapping

9. Small Spaces

10. Local IPC

11. Interrupt and Exception Handling

12. Security

Index

A. Communication Spaces

Operations is an interesting word. Outside of the field of IT it means something completely different than everywhere else in the business world. According to Wikipedia:

Business operations encompasses three fundamental management imperatives that collectively aim to maximize value harvested from business assets

• Generate recurring income

• Increase the value of the business assets

• Secure the income and value of the business

IT operations traditionally does nothing in that regard. Instead IT operations has become about cock blocking and being greybeareded gatekeepers who always say “No” regardless of the question. We shunt the responsibility off to the development staff and then, in some sick game of ‘fuck you’, we do all we can to prevent the code from going live. This is unsustainable; counter-productive; and in a random twist of fate, self destructive.

Some wise wisdom right here.

Ok, I’m documenting this for those that hit this same problem. Is it taking a LONG time to run some Java app, making it seemingly hang? This happens  when running Ubuntu or any flavour of Linux in VMware or Virtual Box. I d/l a pre-made image of Ubuntu Server 9.10 from http://www.thoughtpolice.co.uk/vmware/, put JDK 1.6_18 on it, and went on with installing some app servers and other stuff for setting up a Hudson SWARM.

I attempt to start some Java procs, and they took a long time to start. I broke out strace to see what the hell was going on, and it seems that the procs were getting stuck in FUTEX_WAIT. Googling FUTEX_WAIT lead to many false solutions. Further examination of the strace pointed to some stuff happening in /dev/random just before the FUTUX_WAIT. On a hunch, I reconfigured the /dev/random like so:

rm /dev/random 

mknod -m 644 /dev/random c 1 9 

and VOILA! things started working normally. Hopefully, you get here via a google search and find this solution to save you a couple of hours of agony. 

This shit just cost me a month… wish I’d found this sooner.