Hadoop Viz

Something I've been working on.

Youtube Channel

On my youtube channel, you can view the visualizations I'm working on.

YouTube Channel

Adding Routes at startup

To add routes to be started, the file located at /etc/sysconfig/network-scripts/ifup-routes will parse each file named route-eth*. The file should end up looking like:

ADDRESS0=192.168.2.0
NETMASK0=255.255.255.0
GATEWAY0=192.168.2.1

Senior Design Done

It's the end of the semester, and that means the end of Senior Design. If you are interested in a Linux 3D immersive game using Wii motes, here's the link.

XWarpPointer

Just came across a way to move the mouse pointer to an absolute position in X. Follow the code below:

int main()
{
        Display* xdisplay1 = XOpenDisplay(NULL);
        if(!xdisplay1) {
                printf("display = null\n");
        }
        Window root = DefaultRootWindow(xdisplay1);
        XWarpPointer(xdisplay1, 0, root, 0, 0, 0, 0, 10, 10);
        XCloseDisplay(xdisplay1);

}

Parsing HTTP Responses

Just so I don't have to remember again, in order to seperate a header from the body of a http response, in C:

char* endOfHeader = strstr(buf, "\n\r\n");

Notice the \r, that is a carriage return, something that Linux/unix doesn't care much about, but is used more in Windows. I couldn't find any websites to help with this.

No devices: No Screens Detected.

Had a problem today with the no screens detected on the new Viz wall computers. Solved it by first installing the Nvidia binaries straight from their website, and then allowing X configure itself:

X -configure

cp xorg.conf.new /etc/X11/xorg.conf

nvidia-xconfig

After it configured itself, starting X was only a matter of:

init 5

Then, I had a problem with getting 3 seperate X screens configured to be on top of each other. This was to prove that it was possible, for use on the Viz Wall. I copied over a working xorg.conf from another tile wall with the same configuration, but that one didn't pick up both of the monitors on the single card. There was an error involving not having DFP-0 and DFP-1 setup to be configured. So, after much work, I got the cards to recognize the DFP-0 and DFP-1 as seperate screens (ie. in different screen declarations).

The Xorg.conf (Google Docs)

Moral of the story, Nvidia-Settings is very good at figuring out how to configure monitors.

Fuse DFS Error

So, today I was having problems getting the fuse-dfs to work with my cluster. I was an error compiling fuse for my kernel (2.6.18-92.1.17.el5). It seems that yum has stop providing this kernel, and it's headers (yum install kernel-headers wanted to install a newer version).

To solve this problem, I simply compiled with a older kernel-headers already installed on the machine (2.6.18-53.1.13.el5). To do this:

./configure --with-kernel=kernel-dir && make

The kernel module is in the directory kernel/. Modprobe will not work, instead use insmod.

cd kernel

insmod fuse.ko

This way is probably not the best way to do something like this, but it works.

Fish Monitoring

After a few years of working on the Fish, I have finally published a video of them running, so that they could be demonstrated easier.

Viz Wall Computers

Today I put together a computer spec for the viz wall we are building here at RCF.

Here's the link to the page:
http://docs.google.com/Doc?id=dgjdk82m_23vp8rwfc2