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Part 3
Entries
Entry 1: November 2, 2012
Today I popped an old hard drive into foxtrot, to see if anything was important in there. After installing and turning it on i quickly realized that the drive was old and bad. But I do not want to unplug it now because I am working.
Wedge has notified me of the command hdparm. Reading into the man page, the -y appendage sends the drive into a shutdown state. Excelent.
I needed to point it at the drive “/dev/sdb” using sudo rights of course.
The command was “sudo hdparm -y /dev/sdb”
Entry 2: November 19, 2012
Today I am studying multi-threading within a computer and how it handles more threads then the general time-division multiplexing. The difference appears to be that in multi-threading, each core handles it's own thread. Whereas in time-division multiplexing only effects one thread at a time.
Entry 3: November 20, 2012
Today Pressly asked for a little help from me today involving some [DATA COMMUNICATIONS] stuff. He had configured a router to bridge connections from ethernet and also wireless connections. From there, we connected my macbook via ethernet to his router. From his computer [192.168.10.100] we pinged my computer [192.168.1.100]. This table can be shown using netstat -nr.
Entry 4: November 28, 2012
After talking about it for so long, On Friday we are about to partake in cleaning the cage by putting things into boxes. This is going to teach us many things that we overlook everyday. Cards that we never knew worked from old suns and pcs.
Keywords
data Keyword 3
Valgrind
Definition
A suite of tools used for debugging an existing program. Like Gcc, it uses a powerful debugging tool used by programmers to find breakpoints in their code.
References
data Keyword 3 Phase 2
prefix (polish) notation
Definition
Polish Notation, also known as Prefix Notation, is a form of notation that puts the operator at the beginning instead of between two numbers or other operations. Example:
References
List any sites, books, or sources utilized when researching information on this topic. (Remove any filler text).
- Reference 1
- Reference 2
- Reference 3
Demonstration
Polish notation is widely used in SPARC's as a means of editing values in a stack.
ok 5 5 + ok .c 10 ok / 2 ok .c 5 ok
datacomm Keyword 3
Virtual Private Network
Definition
A virtual private network extends a private network through a tunnel to other computers. It is highly secure and uses encryption to port network activity under a tunnel
References
datacomm Keyword 3 Phase 2 Phase 2 Phase 2
Virtual Private Network
Definition
A virtual private network extends a private network through a tunnel to other computers. It is highly secure and uses encryption to port network activity under a tunnel
References
Demonstration
Demonstration of the indicated keyword.
If you wish to aid your definition with a code sample, you can do so by using a wiki code block, an example follows:
/* * Sample code block */ ====Demonstration==== Demonstration of the indicated keyword. If you wish to aid your definition with a code sample, you can do so by using a wiki **code** block, an example follows: <code c> /* * Sample code block */ #include <stdio.h> int main() { return(0); }
Alternatively (or additionally), if you want to demonstrate something on the command-line, you can do so as follows:
lab46:~$ cd src lab46:~/src$ gcc -o hello hello.c lab46:~/src$ ./hello Hello, World! lab46:~/src$
Demonstration
hpc1 Keyword 3
Threading
Definition
The art of Operating systems ripping running processes into much smaller strings to be delt with by the cpu.
References
hpc1 Keyword 3 Phase 2
Demonstration
A simple threading example in Java shows how it cycles through threads
//: c13:SimpleThread.java // Very simple Threading example. // From 'Thinking in Java, 3rd ed.' (c) Bruce Eckel 2002 // www.BruceEckel.com. See copyright notice in CopyRight.txt. public class SimpleThread extends Thread { private int countDown = 5; private static int threadCount = 0; public SimpleThread() { super("" + ++threadCount); // Store the thread name start(); } public String toString() { return "#" + getName() + ": " + countDown; } public void run() { while(true) { System.out.println(this); if(--countDown == 0) return; } } public static void main(String[] args) { for(int i = 0; i < 5; i++) new SimpleThread(); } } ///:~
Experiment 3
Question
Can I stream music from one computer to another using commands
Resources
Google Wikipedia http://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&cad=rja&sqi=2&ved=0CDAQFjAA&url=http%3A%2F%2Fwww.videolan.org%2Fdoc%2Fstreaming-howto%2Fen%2F&ei=CcC8UIDgFZO30QHVq4G4DQ&usg=AFQjCNGA25CyF7j3BlA0-aEl0TqxNxcx1g&sig2=VMSnSLlDnBvlLVfh-7q9lQ http://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=3&cad=rja&sqi=2&ved=0CEUQFjAC&url=http%3A%2F%2Fwww.engadget.com%2F2005%2F11%2F29%2Fhow-to-stream-almost-anything-using-vlc%2F&ei=CcC8UIDgFZO30QHVq4G4DQ&usg=AFQjCNHGShJygvCAeXSgZU59mDriTftecA&sig2=wQnAn8_7TzbSxlFLIohe0w
Hypothesis
Using vlc, I should be able to stream music over the network and pick it up on another machine
Experiment
I gots me two machines to use and im finna stream some music using vlc.
Data
Perform your experiment, and collect/document the results here.
Analysis
After several unsuccessful tries with udp, I had to mess with the configuration of the command i was sending out. I learned that ts=mux is needed for streaming (despite what the GUI tells you).
I ended up streaming over http protocol, which gave me better access. The udp packets were all being lost and I have no idea where they were going.
The command i used to stream was this: cvlc ~/Music/myheartwillgoon.mp3 –sout '#transcode {vcodec=h264,acodec=mp3,samplerate=44100}:std{access=http,mux=ffmpeg{mux=mp3},dst=0.0.0.0:12345/stream.flv}'
This allowed my computer to be set up as a web server for others to access and stream the music live.
Conclusions
This wasn't easy to do, but there is quite a bit of documentation on it online. Perhaps in the future this experiment can be enhanced.
