From b6627f53bf459334446bb1e2c51728a764c8651d Mon Sep 17 00:00:00 2001
From: johannst <johannst@users.noreply.github.com>
Date: Fri, 14 Mar 2025 01:19:37 +0000
Subject: deploy: cb9e06f3a5bd9d42494e6abdaf61fb3fe19d4ea4
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+<!DOCTYPE HTML>
+<html lang="en" class="light sidebar-visible" dir="ltr">
+ <head>
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+
+ <div id="content" class="content">
+ <main>
+ <h1 id="vtune1"><a class="header" href="#vtune1"><a href="https://www.intel.com/content/www/us/en/docs/vtune-profiler/user-guide">vtune(1)</a></a></h1>
+<p>Vtune offers different analysis. Run <code>vtune -collect help</code> to list the
+availale analysis.</p>
+<h2 id="profiling"><a class="header" href="#profiling">Profiling</a></h2>
+<p>The following shows some common flows with the <code>hotspot</code> analsysis
+as an example.</p>
+<pre><code># Launch and profile process.
+vtune -collect hotspots [opts] -- target [args]
+
+# Attach and profile running process.
+vtune -collect hotspots [opts] -target-pid <pid>
+</code></pre>
+<p>Some common options are the following.</p>
+<pre><code>-r <dir> output directory for the profile
+-no-follow-child dont attach to to child processes (default is to follow)
+-start-paused start with paused profiling
+</code></pre>
+<h2 id="analyze"><a class="header" href="#analyze">Analyze</a></h2>
+<pre><code>vtune-gui <dir>
+</code></pre>
+<h2 id="programmatically-control-sampling"><a class="header" href="#programmatically-control-sampling">Programmatically control sampling</a></h2>
+<p>Vtune offers an API to <em>resume</em> and <em>pause</em> the profile collection from within
+the profilee itself. This can be helpful if either only a certain phase should
+be profiled or some phase should be skipped.</p>
+<p>The following gives an example where only one phase in the program is profiled.
+The program makes calls to the vtune API to resume and pause the collection,
+while vtune is invoked with <code>-start-paused</code> to pause profiling initially.</p>
+<pre><code class="language-c">#include <ittnotify.h>
+
+void init();
+void compute();
+void shutdown();
+
+int main() {
+ init();
+
+ __itt_resume();
+ compute();
+ __itt_pause();
+
+ shutdown();
+ return 0;
+}
+</code></pre>
+<p>The makefile gives an example how to build and profile the application.</p>
+<pre><code class="language-makefile">VTUNE ?= /opt/intel/oneapi/vtune/latest
+
+main: main.c
+ gcc -o $@ $^ -I$(VTUNE)/include -L$(VTUNE)/lib64 -littnotify
+
+vtune: main
+ $(VTUNE)/bin64/vtune -collect hotspots -start-paused -- ./main
+</code></pre>
+
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