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# Sphinx build info version 1
# This file hashes the configuration used when building these files. When it is not found, a full rebuild will be done.
config: 4a0f0f42c4756e69b064e8e0bad43745
config: de7242442a6dee9f8b2ab352b855ee3b
tags: 645f666f9bcd5a90fca523b33c5a78b7
75 changes: 41 additions & 34 deletions docs/build/html/CUDAKernelProgrammingGuide.html
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<!DOCTYPE html>
<html class="writer-html4" lang="en" >
<html class="writer-html5" lang="en" >
<head>
<meta charset="utf-8" />
<meta charset="utf-8" /><meta name="generator" content="Docutils 0.18.1: http://docutils.sourceforge.net/" />

<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>CUDA Kernel Programming Guide &mdash; Apra Pipes v0 documentation</title><link rel="stylesheet" href="_static/css/theme.css" type="text/css" />
<link rel="stylesheet" href="_static/pygments.css" type="text/css" />
<title>CUDA Kernel Programming Guide &mdash; Apra Pipes v0 documentation</title>
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<nav data-toggle="wy-nav-shift" class="wy-nav-side">
<div class="wy-side-scroll">
<div class="wy-side-nav-search" >
<a href="index.html" class="icon icon-home"> Apra Pipes



<a href="index.html" class="icon icon-home">
Apra Pipes
</a>
<div role="search">
<form id="rtd-search-form" class="wy-form" action="search.html" method="get">
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</div><div class="wy-menu wy-menu-vertical" data-spy="affix" role="navigation" aria-label="Navigation menu">
<p class="caption"><span class="caption-text">Contents:</span></p>
<p class="caption" role="heading"><span class="caption-text">Contents:</span></p>
<ul class="current">
<li class="toctree-l1"><a class="reference internal" href="Introduction.html">Introduction</a></li>
<li class="toctree-l1"><a class="reference internal" href="Framework.html">Framework</a></li>
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<div class="rst-content">
<div role="navigation" aria-label="Page navigation">
<ul class="wy-breadcrumbs">
<li><a href="index.html" class="icon icon-home"></a> &raquo;</li>
<li>CUDA Kernel Programming Guide</li>
<li><a href="index.html" class="icon icon-home" aria-label="Home"></a></li>
<li class="breadcrumb-item active">CUDA Kernel Programming Guide</li>
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<a href="_sources/CUDAKernelProgrammingGuide.rst.txt" rel="nofollow"> View page source</a>
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<div role="main" class="document" itemscope="itemscope" itemtype="http://schema.org/Article">
<div itemprop="articleBody">

<div class="section" id="cuda-kernel-programming-guide">
<h1>CUDA Kernel Programming Guide<a class="headerlink" href="#cuda-kernel-programming-guide" title="Permalink to this headline">¶</a></h1>
<div class="section" id="performance-guide">
<h2>Performance Guide<a class="headerlink" href="#performance-guide" title="Permalink to this headline">¶</a></h2>
<section id="cuda-kernel-programming-guide">
<h1>CUDA Kernel Programming Guide<a class="headerlink" href="#cuda-kernel-programming-guide" title="Permalink to this heading"></a></h1>
<section id="performance-guide">
<h2>Performance Guide<a class="headerlink" href="#performance-guide" title="Permalink to this heading"></a></h2>
<p>Very important and useful. Follow the <a class="reference external" href="https://docs.nvidia.com/cuda/cuda-c-best-practices-guide/index.html">CUDA Documentation</a> instead of other sources.</p>
<div class="section" id="coalesced-access-to-global-memory">
<h3>Coalesced Access to Global Memory<a class="headerlink" href="#coalesced-access-to-global-memory" title="Permalink to this headline">¶</a></h3>
<section id="coalesced-access-to-global-memory">
<h3>Coalesced Access to Global Memory<a class="headerlink" href="#coalesced-access-to-global-memory" title="Permalink to this heading"></a></h3>
<p><a class="reference external" href="https://docs.nvidia.com/cuda/cuda-c-best-practices-guide/index.html#coalesced-access-to-global-memory">Coalesced Access to Global Memory</a></p>
<ul>
<li><div class="first line-block">
<li><div class="line-block">
<div class="line">Refer OverlayKernel.cu and EffectsKernel.cu</div>
</div>
</li>
<li><div class="first line-block">
<li><div class="line-block">
<div class="line">uchar4 (4 bytes) - 32x32 threads per block - 4x32x32 - 4K bytes</div>
</div>
</li>
<li><div class="first line-block">
<li><div class="line-block">
<div class="line">A big difference - like 2x in Performance</div>
</div>
</li>
</ul>
</div>
<div class="section" id="math-library">
<h3>Math Library<a class="headerlink" href="#math-library" title="Permalink to this headline">¶</a></h3>
</section>
<section id="math-library">
<h3>Math Library<a class="headerlink" href="#math-library" title="Permalink to this heading"></a></h3>
<p><a class="reference external" href="https://docs.nvidia.com/cuda/cuda-math-api/index.html">NVIDIA CUDA Math API</a></p>
<ul>
<li><div class="first line-block">
<li><div class="line-block">
<div class="line">multiplication use from here</div>
</div>
</li>
<li><div class="first line-block">
<li><div class="line-block">
<div class="line">big difference</div>
</div>
</li>
</ul>
</div>
<div class="section" id="device-functions">
<h3>__device__ functions<a class="headerlink" href="#device-functions" title="Permalink to this headline">¶</a></h3>
</section>
<section id="device-functions">
<h3>__device__ functions<a class="headerlink" href="#device-functions" title="Permalink to this heading"></a></h3>
<p>For writing clean/reusable code, I was using __device__ function - but the Performance dropped by half. So, I started using macros. I didn’t investigate more on why?</p>
</div>
</div>
</div>
</section>
</section>
</section>


</div>
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