You’ll want the dll which pertains to your version and binary type (in my case I want the path referring to v4.030319 and non-64bit).

Next we’ll open up our application in visual studio and start the debugger.First you need to enable unmanaged debugging. So right click on your project and go to properties. You should see a window similar to the one below. Select debugging and make sure the circled checkbox is enabled:

Run your application and wait until the point you want to check your memory usage. You’ll want to look for the pause button or hit CTRL+BREAK to break the running of your application.

Next, open the immediate window or go to Debug->Windows->Immediate Window to bring it up.

Now, you’ll want to load SOS.dll to access the extensions, we do this with the load command in below:

Ok, now we can issue commands to find out information about our system. Type in “!dumpheap” to get a list of all the allocated objects on the heap. Be careful though, you can easily overwhelm your system with output. To summarize and get only the useful information type “!dumpheap –stat”. You see something like this:

The columns in order are, method table, number of instances in memory, total size of instances, type.

!dumpheap has a ton of flags. If you use !dump –type System.String, you can get a summary of all heap objects matching the type (in this case, System.String). Not that the method table is not the same as the memory address. Say we wanted to find out what was holding one of the dictionary objects. We could use !dumpheap –mt <methodtable> to get a list of all the objects in that method table. Then used the address provided to use gcroot to give us all the paths to the object in our application.

Notice in this case there is only one object and one memory address. If your method table or type has many addresses it could be difficult to identify or find your target object (in that case try to find the memory address through a parent object with less instances (or preferably, 1). If we use that address we can use the command “!gcroot 02369d30” to find all references the garbage collector knows is keeping the object down. Output will look something like this:

Work backwards from the bottom of each trace. It starts with the object in question and moves up the reference tree to a root node for the application. This would tell us that the object directly above our object is another dictionary, then a schema context and eventually a template. You can do this for any object you’d like to trace and see if the garbage collector will cleanup the object.

So whatever is holding onto our object could be causing the leak, therefore we could try to remove the link at the appropriate time, then re-observe to verify its status.

There are many functions available for SOS.dll. For a complete list of functions please visit the MSDN site.

In the following example I’m solving an example of the lagrangian dual form used for classification in an SVM.

// Classify using solver
InteriorPointSolver solver = new InteriorPointSolver();

// Langrangian Dual
int dual = 0;
solver.AddRow("L", out dual);

// Sum Constraint
int linearConstraint = 0;
solver.AddRow("SumConstraint", out linearConstraint);

// Add variables and Lagrangian linear terms
int[] vars = new int[n];
for (int i = 0; i < n; i++)
{
	// Add the variable
	solver.AddVariable("a" + i, out vars[i]);

	// Factor in C upper bounds
	solver.SetBounds(vars[i], 0, C);
}

// Linear constraint must equal 0
solver.SetBounds(linearConstraint, 0, 0);

// Lagrangian Quadratic Terms
for (int i = 0; i < n; i++) { 	solver.SetCoefficient(linearConstraint, vars[i], trainingData[i].output()); 	solver.SetCoefficient(dual, vars[i], 1); 	Parallel.For(0, n, o, (int j) =>
	{
		double coef = trainingData[i].output() * trainingData[j].output() *
			kernel.evaluate(trainingData[i].point(), trainingData[j].point());

		solver.SetCoefficient(dual, -0.5 * coef, vars[i], vars[j]);
	});
}

solver.AddGoal(dual, 0, false);

InteriorPointSolverParams param = new InteriorPointSolverParams();

Essentially all we are doing here is adding all the variables to our constraint optimization problem and asking the solver to minimize. The vars array simply expressing a list of identifier for variables in the constraint problem. You should fire up the Solver Foundation library and give it a shot yourself.

Here are some resources that should make understanding this a bit easier as well. Its the official blog of one of the key developers on the project, specifically the links to tutorial on the quadratic programming solver.

Nathan Brixius’ QP Solver Tutorial

Interact With This

Overall we did about 7 miles, which amounts to going a little less than half way of the entire Bake Oven Knob trail, then turning back. I got some great shots I thought I’d share to anyone interested. The Bake Oven Knob privates a great view at its peak which is only about half a mile from the trail entrance.

Created with Admarket’s flickrSLiDR.

However, we have encountered some problems where the Roomba occasionally makes a repeated clicking noise and then shuts off. It then repeats “Please Clean Roomba’s Brushes”. It got to the point where it was making the clicking noise EVERY time it was run and would shut down after about 2 minutes. I tried reseting the battery, cleaning the brushes…everything. Finally I realized what was wrong. I wasn’t cleaning the brushes properly. If you have a lot of dirt in your carpet or pets (we have cats), it’s easy for fibers to get wrapped around some of the moving parts of the roomba brush.

So to fix the problem simply remove the brushes from the Roomba as your normally would to clean them. However, check under the yellow cap at the end of both brushes (by that I mean the brush and the rubber roller). Don’t worry, they are designed to come off, so you can pull on them. Afterwards you may see something like this:

What you may see if your roomba is making a clicking noise

Just pull out all the hair and fibers with a pencil or paper clip and replace the yellow cap. Afterwards your roomba will be good as new! Be aware though, that this is likely to happen again so make sure you periodically clean under the cap of both brush attachments.

Now, thanks to a helpful blog post I was able to correct the problem. Seems like a rather large piece lint had made it’s way into the headphone jack and was blocking the plug. I would have never figured it out if it wasn’t for this helpful blog post. So I’ve linked it below and will leave the explanation to him:

http://www.iphoneincanada.ca/tips-tricks/how-to-fix-your-iphone-headphones-mic-if-its-not-working/

On the command line:

sudo nvidia-xconfig

You should see it tell you that it overrode your xorg.conf. If you get warnings don’t worry, it’s likely just indicating that there was a previous problem. Then on the command line again, type this:

sudo nvidia-settings

Now setup your dual monitor or triple monitor configuration as you want (with Twin View and the correct orientation). Then hit save configuration at the bottom and you should see that you get no error.

Reboot and enjoy.

Ubuntu / Linux

1. Make sure you install the opengl-mesa packages for opengl development. On ubuntu you can get them all with the following invocation:

   sudo apt-get install freeglut3-dev

2. You should include the following #includes in your code referencing opengl:

   #  include <GL/gl.h>
   #  include <GL/glu.h>
   #  include <GL/glut.h>

3. You should also have the following gcc cmdline flags in your makefile:

   gcc -o simple simple.c -lGL -lglut -lGLU

Mac OS X (tested on Snow Leopard)

1. For this to work you will have to install gcc and Xcode, which should install all the required opengl/glut libraries. You can get it here.
2. Now, you’ll have to alter all the #includes in your files to conform to the proper location. Change all your opengl #includes to the following:

   #  include <OpenGL/gl.h>
   #  include <OpenGL/glu.h>
   #  include <GLUT/glut.h>

3. Additionally your gcc command line will need to contain the following flags to link, along with any others you might have:

   gcc -o simple simple.c -framework Carbon -framework OpenGL -framework GLUT

Cross Platform Compatibility

If you want your code to run on both, you need to get the Makefile and code to load the proper libraries depending on your system.

In all your OpenGL .c files, add the following header instead of your linux/mac includes:

#ifdef __APPLE__
#  include <OpenGL/gl.h>
#  include <OpenGL/glu.h>
#  include <GLUT/glut.h>
#else
#  include <GL/gl.h>
#  include <GL/glu.h>
#  include <GL/glut.h>
#endif

Then in your makefile, add the following before your build targets:

#default cmdline flags

LDFLAGS	= -lGL -lglut -lGLU

# Mac OS alternate cmdline link options
ifeq "$(OSTYPE)" "Darwin"
	LDFLAGS	= -framework Carbon -framework OpenGL -framework GLUT
endif

Anyway in my commitment to making a post with something useful every week, I’ve decided to share a tip with the world. Seems as though when I installed my ImageMixer 3 SE software, it would just freeze upon startup. Normally I wouldn’t mind the issue with crap proprietary software, but there is no easy way to edit .MTS/M2TS files without converting and losing quality. Since I prefer to keep the originals as well as edit them so that extra footage is chopped off, I needed to figure out what was wrong. After some digging I found the solution to my problem.

If this occurs for you, you need to install all third party codec packs you installed. I had the CCCP (Community Codec Pak), which is useful for watching MKVs. Unfortunately, that was messing up something, so I had to uninstall it. I found numerous posts talking about uninstalling codec packs, so that’s probably the way to go.

Unfortunately, that eliminates the ability to play back MKV’s in WMV. I don’t have a solution for this but I suggest installing VLC. It is wonderful and plays everything.

My first video, the high definition is better if you go straight to youtube:

After doing this you will be able to:

• Update Google Calendar from the Calendar app on iPhone
• Have new events appear in your main Calendar on gCal
• See newly added events on gCal and your iPhone
• Get your updated Calendar WITHOUT syncing, this is all over the air

1. Go to your Calendar and Mail Settings
2. Select “Add Account”.
3. Choose “Microsoft Exchange”
4. For “Email” enter the e-mail you used for NuevaSync.
5. For “Username” enter your NuevaSync username.
6. For “Password” enter your NuevaSync password.
7. Choose “Next”.
8. When the next screen comes up, choose “Server”. Enter “www.nuevasync.com” for server.



9. Choose “Next”.
10. On the next page, turn off everything except for Calendars. Make sure Calendars is turned on.



11. Tap “Save”

If you go back in your settings you should see something like this:

STEP 3

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