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Backup FileStorage ZOPE/Data.fs

Daniel Talley — Wed, 11 Aug 2010 17:55:06 +0000

Here is the correct command to do a FULL backup of your Plone/ZOPE Data.fs FileStorage files. The location of your backup might be different.

./repozo -B -v -r /usr/local/Plone/zeocluster/var/backups  -f /usr/local/Plone/zeocluster/var/filestorage/Data.fs

How to reinstall Apache2 on Linux/Ubuntu.

Daniel Talley — Wed, 11 Aug 2010 16:12:04 +0000

Are you having issues reinstalling Apache2 on Linux? Cannot figure out how to clear the root directory and reconfigure the package!

Run these commands to properly purge and remove the installation completely:

sudo apt-get remove --purge apache2 apache2-utils

Run this command to reinstall Apache2 on Ubuntu:

sudo apt-get install apache2

Binary Tree Graph with Sagemath

trentonknight — Fri, 18 Dec 2009 03:13:46 +0000

Just a quick note for those who may be looking to make binary tree graphs in Sage. In the end you may be better off using Graphviz for more complex graphing needs. However, if you are determined to use sage here is some example code for a binary tree. I will try and put some more in depth graphs later using NetworkX:

BinaryTree={‘ROOT’:[1],1:[2,3],2:[4,5,6],3:[7,8,9]}
T=DiGraph(BinaryTree)
TREE=T.plot(graph_border=True,vertex_size=120, layout=”tree”,
tree_orientation=”down”,tree_root=’ROOT’,edge_colors=”red”,vertex_labels=True)
TREE.show()

The syntax here is fairly self explanatory. If you need more details remember you can hit the tab key at different points and a better description will be produced. Here is an example view of what you would see after hitting the tab key left of the T. variable (after assigning it to the DiGraph class) . Try hitting the tab key in a variety of areas and you may be surprised what helpful information might pop up. Remember this will work in python as well.

sage binary tree

For more practical use of nodes and graphs check out NetworkX.

PlayDeb

Daniel Talley — Mon, 14 Dec 2009 15:20:06 +0000

Game development on Linux has always been behind due to a variety of reasons. However in recent years the newer generations demands the ability to edit, manipulate, and add content to their games. Homebrew’s are huge now and many are more interested in game development than game playing. One website/repository stands out for Ubuntu/Linux. PlayDeb is an amazing collection of quality open source games. Many are extremely addictive and contain some exciting editing tools within. Syntensity is an amazing new game boasting the open source engine Intensity. The SandBoxGameMaker by Platinum Arts contains a suit of tools for game creation. There are a variety of new and old games created originally from the Sauerbraten game engine. Take a look at PlayDeb and make sure to add their repository to your Ubuntu box and start gaming.

UDK

Daniel Talley — Mon, 14 Dec 2009 15:19:38 +0000

I’m not going to lie, I just about fell out of my chair when I found out the Unreal Engine is now free for non-commercial development. More importantly here is a link to the Epic website here:

http://udk.com/index.html

The Unreal engine is the #1 engine at this time so if you run windows and want to break into game development it can only help to learn these tools.

OpenCL for portable code

Daniel Talley — Mon, 14 Dec 2009 15:19:07 +0000

If any of you own a Playstation 3 you may be aware of its IBM designed Cell processor and NVIDIA based GPU. Sony Open Platform allows you to install Linux as a secondary OS on PS3 which is great. However, it is a considerable pain in the rear that you cannot access the PS3 GPU for development. This effectively stops all real plans of Linux game development on PS3 in it’s tracks. If you have a development license with Sony you can use their version of OpenGL ES (libGCM) , Unreal Engine, their free engine the PhyreEngine or whatnot. However, if you are without a Sony developers license there is an alternative way to harness an even more powerful technology.

Enter OpenCL! Memory management, full access to your GPU, and so forth can be assisted by OpenCL. OpenCL is a new open standard originally pioneered by Apple and adopted by KHRONOS. One of the biggest obstacles for developers now is dealing with the massive array of different hardware and new API’s for each of them. How do you keep up? More to the point how do you handle the new Cell processors accompanied by powerful GPU’s like NVIDIA’s Tesla? Do you want to process the code on your GPU or CPU and which GPU!!?

Get the OpenCL specification header files from KHRONOS here:

http://www.khronos.org/registry/cl/

For SDK’s that include OpenCL:

For Apple Snow Leopard: OpenCL

For NVIDIA GPU users check out the: CUDA SDK

For ATI GPU’s check out the: ATI Stream Software Development Kit

For Bullet Physics developers it looks hopeful that they are currently implementing OpenCL.

For further discussion use our blog here: http://developers.cipherhive.com/course/view.php?id=3