CUDA_C.ipynb

{
 "cells": [
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "# Accelerating C/C++ code with CUDA on GPUs\n",
    "\n",
    "In Part 1 of this self-paced, hands-on lab, we will use CUDA C/C++ to accelerate code on NVIDIA GPUs.\n",
    "\n",
    "Lab created by Mark Ebersole (Follow [@CUDAHamster](https://twitter.com/@cudahamster) on Twitter)\n",
    "\n",
    "This lab has been modified by Prof. Michael Krajecki to be executed on the ROMEO supercomputer (Follow [@KrajeckiMichael](https://twitter.com/@krajeckimichael) on Twitter)"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "Let's execute the cell below to display information about the GPUs running on the server."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 1,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Wed Dec 13 08:13:20 2017       \r\n",
      "+-----------------------------------------------------------------------------+\r\n",
      "| NVIDIA-SMI 384.81                 Driver Version: 384.81                    |\r\n",
      "|-------------------------------+----------------------+----------------------+\r\n",
      "| GPU  Name        Persistence-M| Bus-Id        Disp.A | Volatile Uncorr. ECC |\r\n",
      "| Fan  Temp  Perf  Pwr:Usage/Cap|         Memory-Usage | GPU-Util  Compute M. |\r\n",
      "|===============================+======================+======================|\r\n",
      "|   0  Tesla K20Xm         On   | 00000000:02:00.0 Off |                  Off |\r\n",
      "| N/A   25C    P8    18W / 235W |      1MiB /  6082MiB |      0%   E. Process |\r\n",
      "+-------------------------------+----------------------+----------------------+\r\n",
      "|   1  Tesla K20Xm         On   | 00000000:84:00.0 Off |                  Off |\r\n",
      "| N/A   24C    P8    18W / 235W |      1MiB /  6082MiB |      0%   E. Process |\r\n",
      "+-------------------------------+----------------------+----------------------+\r\n",
      "                                                                               \r\n",
      "+-----------------------------------------------------------------------------+\r\n",
      "| Processes:                                                       GPU Memory |\r\n",
      "|  GPU       PID   Type   Process name                             Usage      |\r\n",
      "|=============================================================================|\r\n",
      "|  No running processes found                                                 |\r\n",
      "+-----------------------------------------------------------------------------+\r\n"
     ]
    }
   ],
   "source": [
    "!nvidia-smi\n"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Introduction to CUDA C/C++\n",
    "\n",
    "In this lab, we will learn how to write GPU code using C or C++, two of the ever growing list of CUDA enabled languages.  By learning just a few new syntactic elements, as well as a few API calls, we'll be able to unlock the massively parallel capability of an NVIDIA GPU.\n",
    "\n",
    "Watch the following short video introduction to Grids, Blocks, and Threads:"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 2,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/html": [
       "\n",
       "        <iframe\n",
       "            width=\"640\"\n",
       "            height=\"390\"\n",
       "            src=\"https://www.youtube.com/embed/KM-zbhyz9f4\"\n",
       "            frameborder=\"0\"\n",
       "            allowfullscreen\n",
       "        ></iframe>\n",
       "        "
      ],
      "text/plain": [
       "<IPython.lib.display.IFrame at 0x7fa8cc12c5f8>"
      ]
     },
     "execution_count": 2,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "from IPython.display import IFrame\n",
    "IFrame('https://www.youtube.com/embed/KM-zbhyz9f4', width=640, height=390)"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "This lab consists of a number of tasks that will require you to modify some code, compile and execute it.  For each task, a solution is provided so you can check your work or take a peek if you get lost.\n",
    "\n",
    "If you are still confused now, or at any point in this lab, you can consult the <a href=\"#FAQ\">FAQ</a> located at the bottom of this page."
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Hello Parallelism\n",
    "\n",
    "For the first task, we are going to be using the following concepts:\n",
    "\n",
    "* <code style=\"color:green\">&#95;&#95;global&#95;&#95;</code> - this keyword is used to tell the CUDA compiler that the function is to be compiled for the GPU, and is callable from both the host and the GPU itself.  For CUDA C/C++, the nvcc compiler will handle compiling this code.\n",
    "* <code style=\"color:green\">blockIdx.x</code> - this is a read-only variable that is defined for you.  It is used within a GPU kernel to determine the ID of the block which is currently executing code.  Since there will be many blocks running in parallel, we need this ID to help determine which chunk of data that particular block will work on.\n",
    "* <code style=\"color:green\">threadIdx.x</code> - this is a read-only variable that is defined for you.  It is used within a GPU kernel to determine the ID of the thread which is currently executing code in the active block.\n",
    "* <code style=\"color:green\">blockDim.x</code> - this is a read-only variable that is defined for you.  It simply returns a value indicating the number of threads there are per block.  Remember that all the blocks scheduled to execute on the GPU are identical, except for the <code style=\"color:green\">blockIdx.x</code> value.\n",
    "* <code style=\"color:green\">myKernel <<< number_of_blocks, threads_per_block>>> (...)</code> -  this is the syntax used to launch a kernel on the GPU.  Inside the triple-angle brackets we set two values.  The first is the total number of blocks we want to run on the GPU, and the second is the number of threads there are per block.  It's possible, and in fact recommended, for one to schedule more blocks than the GPU can actively run in parallel.  In this case, the system will just continue executing blocks until they have all run.\n",
    "\n",
    "Let's explore the above concepts by doing a simple \"Hello Parallelism\" example.\n",
    "\n",
    "There is nothing you need to do to the code to get this example to work.  Before touching the code at all, select the next cell down and hit Ctrl-Enter (or the play button in the toolbar) to compile using the nvcc compiler from NVIDIA and run it.  The nvcc compiler does the following basic steps:\n",
    "\n",
    "1. From the .cu source file, separate code which should be compiled for the GPU and the code which should be compiled for the CPU\n",
    "2. nvcc will compile the GPU code itself\n",
    "3. nvcc will give the host compiler, in our case gcc, the CPU code to compile\n",
    "4. Link the compiled code from #2 and #3 and create the executable\n",
    "\n",
    "If everything is working, you should see the following: <code>Hello from Thread 0 in block 0</code>"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 18,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Server name: romeo109\n",
      "Wed Dec 13 08:50:24 CET 2017\n",
      "Compile and run...\n",
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      "Hello World from Thread 857 in block 60\n"
     ]
    },
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Hello World from Thread 858 in block 60\n",
      "Hello World from Thread 859 in block 60\n",
      "Hello World from Thread 860 in block 60\n",
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     ]
    },
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Hello World from Thread 359 in block 60\n",
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     ]
    },
    {
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     "output_type": "stream",
     "text": [
      "Hello World from Thread 244 in block 60\n",
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      "Hello World from Thread 448 in block 61\n",
      "Hello World from Thread 449 in block 61\n"
     ]
    },
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Hello World from Thread 450 in block 61\n",
      "Hello World from Thread 451 in block 61\n",
      "Hello World from Thread 452 in block 61\n",
      "Hello World from Thread 453 in block 61\n",
      "Hello World from Thread 454 in block 61\n",
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     ]
    },
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Hello World from Thread 878 in block 61\n",
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      "Hello World from Thread 564 in block 61\n",
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      "Hello World from Thread 566 in block 61\n",
      "Hello World from Thread 567 in block 61\n",
      "Hello World from Thread 568 in block 61\n",
      "Hello World from Thread 569 in block 61\n",
      "Hello World from Thread 570 in block 61\n"
     ]
    },
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Hello World from Thread 571 in block 61\n",
      "Hello World from Thread 572 in block 61\n",
      "Hello World from Thread 573 in block 61\n",
      "Hello World from Thread 574 in block 61\n",
      "Hello World from Thread 575 in block 61\n",
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      "Hello World from Thread 583 in block 61\n"
     ]
    },
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Hello World from Thread 584 in block 61\n",
      "Hello World from Thread 585 in block 61\n",
      "Hello World from Thread 586 in block 61\n",
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      "Hello World from Thread 725 in block 62\n",
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      "Hello World from Thread 815 in block 62\n",
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      "Hello World from Thread 820 in block 62\n",
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      "Hello World from Thread 825 in block 62\n",
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      "Hello World from Thread 827 in block 62\n",
      "Hello World from Thread 828 in block 62\n",
      "Hello World from Thread 829 in block 62\n",
      "Hello World from Thread 830 in block 62\n",
      "Hello World from Thread 831 in block 62\n",
      "Hello World from Thread 416 in block 62\n",
      "Hello World from Thread 417 in block 62\n",
      "Hello World from Thread 418 in block 62\n",
      "Hello World from Thread 419 in block 62\n",
      "Hello World from Thread 420 in block 62\n",
      "Hello World from Thread 421 in block 62\n",
      "Hello World from Thread 422 in block 62\n",
      "Hello World from Thread 423 in block 62\n",
      "Hello World from Thread 424 in block 62\n",
      "Hello World from Thread 425 in block 62\n",
      "Hello World from Thread 426 in block 62\n",
      "Hello World from Thread 427 in block 62\n",
      "Hello World from Thread 428 in block 62\n",
      "Hello World from Thread 429 in block 62\n",
      "Hello World from Thread 430 in block 62\n",
      "Hello World from Thread 431 in block 62\n",
      "Hello World from Thread 432 in block 62\n",
      "Hello World from Thread 433 in block 62\n",
      "Hello World from Thread 434 in block 62\n",
      "Hello World from Thread 435 in block 62\n",
      "Hello World from Thread 436 in block 62\n",
      "Hello World from Thread 437 in block 62\n",
      "Hello World from Thread 438 in block 62\n",
      "Hello World from Thread 439 in block 62\n",
      "Hello World from Thread 440 in block 62\n",
      "Hello World from Thread 441 in block 62\n",
      "Hello World from Thread 442 in block 62\n",
      "Hello World from Thread 443 in block 62\n",
      "Hello World from Thread 444 in block 62\n",
      "Hello World from Thread 445 in block 62\n",
      "Hello World from Thread 446 in block 62\n",
      "Hello World from Thread 447 in block 62\n",
      "Hello World from Thread 256 in block 61\n",
      "Hello World from Thread 257 in block 61\n",
      "Hello World from Thread 258 in block 61\n",
      "Hello World from Thread 259 in block 61\n"
     ]
    },
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Hello World from Thread 260 in block 61\n",
      "Hello World from Thread 261 in block 61\n",
      "Hello World from Thread 262 in block 61\n",
      "Hello World from Thread 263 in block 61\n",
      "Hello World from Thread 264 in block 61\n",
      "Hello World from Thread 265 in block 61\n",
      "Hello World from Thread 266 in block 61\n",
      "Hello World from Thread 267 in block 61\n",
      "Hello World from Thread 268 in block 61\n",
      "Hello World from Thread 269 in block 61\n",
      "Hello World from Thread 270 in block 61\n",
      "Hello World from Thread 271 in block 61\n",
      "Hello World from Thread 272 in block 61\n",
      "Hello World from Thread 273 in block 61\n",
      "Hello World from Thread 274 in block 61\n",
      "Hello World from Thread 275 in block 61\n",
      "Hello World from Thread 276 in block 61\n",
      "Hello World from Thread 277 in block 61\n",
      "Hello World from Thread 278 in block 61\n",
      "Hello World from Thread 279 in block 61\n",
      "Hello World from Thread 280 in block 61\n",
      "Hello World from Thread 281 in block 61\n",
      "Hello World from Thread 282 in block 61\n",
      "Hello World from Thread 283 in block 61\n",
      "Hello World from Thread 284 in block 61\n",
      "Hello World from Thread 285 in block 61\n",
      "Hello World from Thread 286 in block 61\n",
      "Hello World from Thread 287 in block 61\n",
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      "Hello World from Thread 952 in block 63\n"
     ]
    },
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Hello World from Thread 953 in block 63\n",
      "Hello World from Thread 954 in block 63\n",
      "Hello World from Thread 955 in block 63\n",
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      "Hello World from Thread 706 in block 63\n",
      "Hello World from Thread 707 in block 63\n",
      "Hello World from Thread 708 in block 63\n",
      "Hello World from Thread 709 in block 63\n",
      "Hello World from Thread 710 in block 63\n",
      "Hello World from Thread 711 in block 63\n",
      "Hello World from Thread 712 in block 63\n",
      "Hello World from Thread 713 in block 63\n",
      "Hello World from Thread 714 in block 63\n",
      "Hello World from Thread 715 in block 63\n",
      "Hello World from Thread 716 in block 63\n",
      "Hello World from Thread 717 in block 63\n",
      "Hello World from Thread 718 in block 63\n",
      "Hello World from Thread 719 in block 63\n",
      "Hello World from Thread 720 in block 63\n",
      "Hello World from Thread 721 in block 63\n",
      "Hello World from Thread 722 in block 63\n",
      "Hello World from Thread 723 in block 63\n",
      "Hello World from Thread 724 in block 63\n",
      "Hello World from Thread 725 in block 63\n",
      "Hello World from Thread 726 in block 63\n",
      "Hello World from Thread 727 in block 63\n",
      "Hello World from Thread 728 in block 63\n",
      "Hello World from Thread 729 in block 63\n",
      "Hello World from Thread 730 in block 63\n",
      "Hello World from Thread 731 in block 63\n",
      "Hello World from Thread 732 in block 63\n",
      "Hello World from Thread 733 in block 63\n",
      "Hello World from Thread 734 in block 63\n",
      "Hello World from Thread 735 in block 63\n"
     ]
    },
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Done.\n"
     ]
    }
   ],
   "source": [
    "%%bash\n",
    "# Execute this cell to compile & run the Hello Parallelism example labeled task1\n",
    "echo \"Server name:\" $HOSTNAME\n",
    "module load cuda/8.0\n",
    "date\n",
    "echo \"Compile and run...\"\n",
    "nvcc -arch=sm_30 -o task1_out exercices/task1.cu -run\n",
    "echo \"Done.\""
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "### Task #1\n",
    "\n",
    "Your first task in this lab is to play around with the number of blocks, and threads per block by modifying the values in the `<<< >>>` brackets. To make these changes, click on the `exercices` folder in the editor below.  After that you should be able to select task1.cu to open the file.\n",
    "\n",
    "* What do you expect to see if you do `<<<2, 1>>>`?\n",
    "I expect to see two hello world print\n",
    "```\n",
    "Hello World from Thread 0 in block 0\n",
    "Hello World from Thread 0 in block 1\n",
    "```\n",
    "* What do you expect to see if you do `<<<1, 18>>>`? Do the threads print out their values in order?\n",
    "I expect to see 18 printf from thread 0 block 0 to thread 17 block 0 (and not  in order in all case) \n",
    "--> en fait c'est dans l'odre car petit nb de thread\n",
    "* Can you make the values in the `<<< >>>` arbitrarily large?\n",
    "si valeur très large, alors pas dans l'ordre\n",
    "limite à 1024 threads par block\n",
    "\n",
    "\n",
    "\n",
    "After making a change, **make sure to save the file** by simply clicking the `save` button below.  As a reminder, saving the file actually saves it on the ROMEO cluster you're working on.  To get a copy of the files, consult the <a href=\"#post-lab\">Post-Lab</a> section near the end of this page.\n",
    "\n",
    "To compile and run, simply re-execute the cell above this area."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 21,
   "metadata": {
    "scrolled": true
   },
   "outputs": [
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     "data": {
      "text/html": [
       "\n",
       "        <iframe\n",
       "            width=\"100%\"\n",
       "            height=\"500\"\n",
       "            src=\"https://romeolab.univ-reims.fr/702_rJLmCD9TQITbmeifa6i69Ld/edit/exercices/task1.cu\"\n",
       "            frameborder=\"0\"\n",
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    "editor('exercices/task1.cu')"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "Congratulations!  You have successfully modified, compiled and executed your first program on the GPU!\n",
    "\n",
    "Besides just getting our hands dirty compiling and executing code on the GPU, task1 was meant to enforce a fundamental principle.  If you set the number of threads per block to at least 18, you should have noticed the threads were no longer printing their Hello Parallelism strings in ascending order - some randomness started to creep in.  The reason for this, is we're executing these blocks & threads on a massively parallel GPU.  So there will be 100's if not 1000's of threads all executing simultaneously with respect to each other.  It's basically a race condition to see who gets to print their values first.\n",
    "\n",
    "In a more realistic example, like we'll work on below, we need to ensure there is enough memory allocated to hold the results from all our threads, so we do not have such a race condition."
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Writing and Launching GPU Kernels\n",
    "\n",
    "### Task #2\n",
    "\n",
    "Now that you have had some experience launching a function on the GPU with different numbers of threads, it's time to write your first GPU kernel yourself.  You're going to be accelerating the ever popular SAXPY (**S**ingle-precision **A** times **X** **P**lus **Y**) function on the GPU using CUDA C/C++.\n",
    "\n",
    "Using the concepts introduced in Task #1, modify the following code to run on the GPU.  The `#FIXME :...#` text in the code will help you focus on the appropriate areas that need modification.  You'll probably notice two new API calls in the code below; `cudaMallocManaged` and `cudaFree`.  These two functions are working with managed memory using CUDA's Unified Memory system.  We'll explore this in Part 2 of this lab.  For the moment, you just need to know that they are replacing `malloc` and `free`, respectively.\n",
    "\n",
    "In the text editor below, open the task2.cu file and begin working.  If you get stuck, or just want to check your answer, feel free to look at the task2_solution.cu file."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 19,
   "metadata": {
    "scrolled": false
   },
   "outputs": [
    {
     "data": {
      "text/html": [
       "\n",
       "        <iframe\n",
       "            width=\"100%\"\n",
       "            height=\"500\"\n",
       "            src=\"https://romeolab.univ-reims.fr/702_rJLmCD9TQITbmeifa6i69Ld/edit/exercices/task2.cu\"\n",
       "            frameborder=\"0\"\n",
       "            allowfullscreen\n",
       "        ></iframe>\n",
       "        "
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   ],
   "source": [
    "editor('exercices/task2.cu')"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 23,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Server name: romeo109\n",
      "Wed Dec 13 08:54:45 CET 2017\n",
      "Compile and run...\n",
      "c[0] = 5, c[1] = 5, c[2] = 5, c[3] = 5, c[4] = 5, \n",
      "c[4194299] = 5, c[4194300] = 5, c[4194301] = 5, c[4194302] = 5, c[4194303] = 5, \n",
      "Done\n"
     ]
    }
   ],
   "source": [
    "%%bash\n",
    "echo \"Server name:\" $HOSTNAME\n",
    "module load cuda/8.0\n",
    "date\n",
    "echo \"Compile and run...\"\n",
    "nvcc -arch=sm_30 -o task2_out exercices/task2.cu -run\n",
    "echo \"Done\""
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "The output of your program should be all 5's.  If you got this, you have successfully modified the saxpy function to execute on the massively parallel GPU!  If you are still not able to get the correct output, please have a look at the task2_solution.cu file and see if you can figure out what you were missing!"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "### Task #3\n",
    "\n",
    "The next function we will accelerate is a basic matrix multiplication function.  In this simplified example, we'll assume our matrices are all square - they have the same number of rows and columns.  Your goal is to modify the `matrixMulGPU` function with CUDA so it will run on the GPU.  However, there is a new twist!  Instead of just using one-dimensional blocks of threads and blocks, we'll be using two dimensions; x and y.  So, in addition to using `blockIdx.x`, `blockDim.x`, and `threadIdx.x`, you'll also need to use <code>blockIdx.<span style=\"color:orange\">**y**</span></code>, <code>blockDim.<span style=\"color:orange\">**y**</span></code>, and <code>threadIdx.<span style=\"color:orange\">**y**</span></code>. \n",
    "\n",
    "Besides replacing the `#FIXME: ...#` blocks in the `matrixMulGPU` function, you will need to finish initializing the `number_of_blocks` variable in the `main` function to launch the appropriate number of thread blocks.  This is all marked with `#FIXME: ...#` in the code.\n",
    "\n",
    "Please make use of the hints provided if you get stuck, and you can always check the task3_solution.cu file to see the answer.\n",
    "\n",
    "**Note**: do not modify the CPU version `matrixMulCPU`.  This is used to verify the results of the GPU version.\n",
    "\n",
    "[Hints for Task #3](#Task-#3-Hints)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 24,
   "metadata": {
    "scrolled": true
   },
   "outputs": [
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       "\n",
       "        <iframe\n",
       "            width=\"100%\"\n",
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    "editor('exercices/task3.cu')"
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  {
   "cell_type": "code",
   "execution_count": 60,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Submitted batch job 1018617\n",
      "Running ..\n",
      "End batch job 1018617 Status:  COMPLETED \n",
      "\n",
      "Slurm command was : sbatch -n 1 -N 1 -n 2 -c 8 --gres=gpu:2 --output=/home/lab00041/GPUAvanceInfo0935-FA2017/NvidiaCuda/python-execute-slurm/%J.out --error=/home/lab00041/GPUAvanceInfo0935-FA2017/NvidiaCuda/python-execute-slurm/%J.err\n",
      "Server name: romeo100\n",
      "Wed Dec 13 09:52:24 CET 2017\n",
      "Compile and run...\n",
      "Success!\n",
      "Done\n"
     ]
    }
   ],
   "source": [
    "%%execute\n",
    "echo \"Server name:\" $HOSTNAME\n",
    "module load cuda/8.0\n",
    "date\n",
    "echo \"Compile and run...\"\n",
    "nvcc -arch=sm_30 -o task3_out exercices/task3.cu -run\n",
    "echo \"Done\""
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Error Handling\n",
    "\n",
    "If you started changing with the number of blocks and threads per block in the above examples, you may have noticed some cases where you were not getting the expected answer.  Up to this point we have not added any type of error checking, which makes it very hard to tell why a problem is occurring.  Error checking is just as important when programming for a GPU as for a CPU.  So let's add some error checking to the SAXPY example and see if we can introduce some errors to catch.\n",
    "\n",
    "**Note**: In order to focus on a specific topic, and to keep code and instructions short, a number of examples in this lab leave out error checking code.  However, it is highly encourage you include error checking in your code whenever possible!\n",
    "\n",
    "### Task #4\n",
    "\n",
    "The SAXPY code for this task is slightly different than in Task #2.  For starters, we are storing the result of our computation back into the `y` array instead of a separate array.  We're also using `float` values for our arrays instead of integers.  On the host side, after calculating our SAXPY result, the code will check for correctness.  If everything is working, the program will print `Max Error: 0.00000`.\n",
    "\n",
    "Now let's discuss the different types of errors we need to check for.  Kernels are launched asynchronously with respect to the host, meaning that control returns to the host code immediately **after** a kernel is launched but **before** the kernel completes. As a result we need to check for two types of error; synchronous errors dealing with the kernel launch and asynchronous errors that can happen during kernel execution. To check for synchronous errors we use the function `cudaGetLastError()`, which returns an integer error code. In the example below we compare the result of `cudaGetLastError()` and if it does not equal `cudaSuccess` (defined in the `cudaFor` module), we have an error:\n",
    "\n",
    "```cpp\n",
    "cudaError_t ierrSync;\n",
    "...\n",
    "myKernel<<<grid, blocks>>>(...);\n",
    "ierrSync = cudaGetLastError();\n",
    "if (ierrSync != cudaSuccess) { printf(\"Sync error: %s\\n\", cudaGetErrorString(ierrSync)); }\n",
    "```\n",
    "\n",
    "To check for an error during execution we need to wait for the kernel to complete.  This is accomplished using the function `cudaDeviceSynchronize()`. As with all CUDA API calls, `cudaDeviceSynchronize()` returns an integer error code and used in this fashion will capture any error that occurs on the device while executing the kernel.  Example usage:\n",
    "\n",
    "```cpp\n",
    "cudaError_t ierrAsync;\n",
    "...\n",
    "myKernel<<<grid, blocks>>>(...);\n",
    "ierrAsync = cudaDeviceSynchronize();\n",
    "if (ierrAsync != cudaSuccess) { printf(\"Async error: %s\\n\", cudaGetErrorString(ierrSync)); }\n",
    "```\n",
    "    \n",
    "In addition to the above code changes, there is a logic bug introduced in the code below.  Your objective for Task #4 is to add both types of error checking to the source code and try to find the bug.  Before modifying any code, compile and run the programs as it is and see the result.  Then add error checking and see if you can figure out what the bug is and fix it.  As always, the solution is provided so you can check your work, or look at if you get stuck.\n",
    "\n",
    "[Hints for Task #4](#Task-#4-Hints)"
   ]
  },
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   "cell_type": "code",
   "execution_count": 61,
   "metadata": {
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       "\n",
       "        <iframe\n",
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    "editor('exercices/task4.cu')"
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  {
   "cell_type": "code",
   "execution_count": 65,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Submitted batch job 1018638\n",
      "Running ..\n",
      "End batch job 1018638 Status:  COMPLETED \n",
      "\n",
      "Slurm command was : sbatch -n 1 -N 1 -n 2 -c 8 --gres=gpu:2 --output=/home/lab00041/GPUAvanceInfo0935-FA2017/NvidiaCuda/python-execute-slurm/%J.out --error=/home/lab00041/GPUAvanceInfo0935-FA2017/NvidiaCuda/python-execute-slurm/%J.err\n",
      "Server name: romeo22\n",
      "Wed Dec 13 10:01:02 CET 2017\n",
      "Compile and run...\n",
      "Max Error: 0.00000Done\n"
     ]
    }
   ],
   "source": [
    "%%execute\n",
    "echo \"Server name:\" $HOSTNAME\n",
    "module load cuda/8.0\n",
    "date\n",
    "echo \"Compile and run...\"\n",
    "nvcc -arch=sm_30 -o task4_out exercices/task4.cu -run\n",
    "echo \"Done\""
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Learn More\n",
    "\n",
    "Please take Part 2 of this lab to learn more about querying GPU Devices, Memory Management, and a case study!\n",
    "\n",
    "If you are interested in learning more, you can use the following resources:\n",
    "\n",
    "* Learn more at the [CUDA Developer Zone](https://developer.nvidia.com/category/zone/cuda-zone).\n",
    "* If you have an NVIDIA GPU in your system, you can download and install the [CUDA tookit](https://developer.nvidia.com/cuda-toolkit).\n",
    "* Take the fantastic online and **free** Udacity [Intro to Parallel Programming](https://www.udacity.com/course/cs344) course which uses CUDA C.\n",
    "* Search or ask questions on [Stackoverflow](http://stackoverflow.com/questions/tagged/cuda) using the cuda tag"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "<a id=\"post-lab\"></a>\n",
    "## Post-Lab\n",
    "\n",
    "Finally, don't forget to save your work from this lab before time runs out and the instance shuts down!!\n",
    "\n",
    "1. Save this IPython Notebook by going to `File -> Download as -> IPython (.ipynb)` at the top of this window\n",
    "2. You can execute the following cell block to create a zip-file of the files you've been working on, and download it with the link below."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {
    "collapsed": true
   },
   "outputs": [],
   "source": [
    "%%bash\n",
    "rm -f cuda_c_files_part1.zip\n",
    "zip -r cuda_c_files_part1.zip exercices/*"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "**After** executing the above cell, you should be able to download the zip file [here](files/cuda_c_files_part1.zip)"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "<a id=\"FAQ\"></a>\n",
    "---\n",
    "# Lab FAQ\n",
    "\n",
    "Q: I'm encountering issues executing the cells, or other technical problems?<br>\n",
    "A: Please see [this](https://developer.nvidia.com/self-paced-labs-faq#Troubleshooting) infrastructure FAQ.\n",
    "\n",
    "Q: I'm getting unexpected behavior (i.e., incorrect output) when running any of the tasks.<br>\n",
    "A: It's possible that one or more of the CUDA Runtime API calls are actually returning an error, but the code above is not checking for this (due to the time constraints of this lab).  Try checking the return value of any CUDA Runtime API call and see if the value is non-zero indicating an error."
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Hints\n",
    "\n",
    "---\n",
    "\n",
    "### Task #3 Hints\n",
    "\n",
    "#### Hint #1\n",
    "You'll be using a single thread to calculate one element of the output matrix `c`.  Each thread will execute the inner-most loop of the matrix multiplication formula.\n",
    "\n",
    "#### Hint #2\n",
    "The `row` value should be set to `blockIdx.x * blockDim.x + threadIdx.x` to get the thread which is calculating the row part of the `c` matrix.  Can you figure out what the `col` value should be set to?\n",
    "\n",
    "#### Hint #3\n",
    "Don't forget the `__global__` keyword to tell the compiler that `matrixMulGPU` is now a GPU function!\n",
    "\n",
    "#### Hint #4\n",
    "Just like the CPU version, we need to make sure we do not do more work than we have data.  Make sure you're doing a check in your modified code so that `row` **and** `col` are less than N.\n",
    "\n",
    "[Return to Task #3](#Task-#3)\n",
    "\n",
    "---\n",
    "### Task #4 Hints\n",
    "\n",
    "#### Hint #1\n",
    "An error string of \"invalid configuration argument\" usually indicates there are to many threads per block being used.\n",
    "\n",
    "#### Hint #2\n",
    "The max number of threads in the X-dimension for our GPU is 1024, but you could choose a value less than that as well\n",
    "\n",
    "[Return to Task #4](#Task-#4)"
   ]
  },
  {
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    "\n",
    "<style>\n",
    "p.hint_trigger{\n",
    "  margin-bottom:7px;\n",
    "  margin-top:-5px;\n",
    "  background:#64E84D;\n",
    "}\n",
    ".toggle_container{\n",
    "  margin-bottom:0px;\n",
    "}\n",
    ".toggle_container p{\n",
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    ".toggle_container{\n",
    "  background:#f0f0f0;\n",
    "  clear: both;\n",
    "  font-size:100%;\n",
    "}\n",
    "</style>\n",
    "<script>\n",
    "$(\"p.hint_trigger\").click(function(){\n",
    "   $(this).toggleClass(\"active\").next().slideToggle(\"normal\");\n",
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