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利用火焰图分析ceph-mds进程的cpu占用-简单介绍
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<p>利用火焰图分析ceph-mds进程的cpu占用-简单介绍</p>
<p><strong>Perf工具简介</strong></p>
<p>它是 Linux 系统原生提供的性能分析工具，用来进行软件性能分析的工具。是linux中用于分析性能问题的一大利器，可以针对一个运行着的程序，对系统进行采样，会返回 CPU 正在执行的函数名以及调用栈（stack）。<br>通常，它的执行频率是 99Hz（每秒99次），如果99次都返回同一个函数名，那就说明 CPU 这一秒钟都在执行同一个函数，可能存在性能问题。<br><a id="more"></a><br>安装</p>
<pre><code>yum install perf
</code></pre><p><strong>火焰图（Flame Graphs）简介：</strong></p>
<p><a href="http://www.brendangregg.com/flamegraphs.html" target="_blank" rel="noopener">http://www.brendangregg.com/flamegraphs.html</a></p>
<p>火焰图是基于 perf 结果产生的 svg图片，用来展示 CPU 的调用栈。<br><img src="https://i.imgur.com/rniB5kO.jpg" alt=""></p>
<p>y 轴表示调用栈，每一层都是一个函数。调用栈越深，火焰就越高，顶部就是正在执行的函数，下方都是它的父函数。<br>x 轴表示抽样数，如果一个函数在 x 轴占据的宽度越宽，就表示它被抽到的次数多，即执行的时间长。注意，x 轴不代表时间，而是所有的调用栈合并后，按字母顺序排列的。<br>火焰图就是看顶层的哪个函数占据的宽度最大。只要有”平顶”（plateaus），就表示该函数可能存在性能问题</p>
<p><strong>下载</strong></p>
<p>Git brendangregg大神的火焰图生成程序</p>
<pre><code>git clone https://github.com/brendangress/FlameGraph
</code></pre><p><strong>使用</strong></p>
<p>进入到下载目录，另外窗口客户端对集群进行写操作，期间通过perf对mds进程进行采样收集。</p>
<p>客户端写入：</p>
<pre><code>time dd if=/dev/zero of=a bs=1M count=1024 oflag=direct
</code></pre><p>对mds进程进行perf测试并采样30s</p>
<pre><code>[root@ceph01 FlameGraph]# perf record -e cpu-clock --call-graph dwarf -p 17484 -- sleep 30
[ perf record: Woken up 1 times to write data ]
[ perf record: Captured and wrote 0.327 MB perf.data (1 samples) ]
[root@ceph01 FlameGraph]#
</code></pre><p><strong>分析</strong></p>
<p>首先对之前的采样结果进行整理</p>
<pre><code>[root@ceph01 FlameGraph]# perf script | ./stackcollapse-perf.pl > ceph-mds.out
</code></pre><p>生成火焰图</p>
<pre><code>[root@ceph01 FlameGraph]# ./flamegraph.pl ceph-mds.out > ceph-mds.svg
</code></pre><p>下载该svg文件并通过chrome浏览器打开<br><img src="https://i.imgur.com/ZcFZ2OM.jpg" alt=""><br>总结</p>
<p>火焰图的功能不止这一点，当然perf作为linux下的性能测试的一大神器，其功能也不仅仅这一点。该PPT的内容仅作为抛砖引玉之用。</p>
<p>参考网站 <a href="http://www.brendangregg.com/flamegraphs.html" target="_blank" rel="noopener">http://www.brendangregg.com/flamegraphs.html</a></p>
<p>后期关于一些测试方面的经验再做分享。</p>
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path: true
text: false
raw: false
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slug: false
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comments: false
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tags: true
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