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-        <h3 id="背景"><a href="#背景" class="headerlink" title="背景"></a>背景</h3><p>Pika 可以通过慢查询 (Slowlog) 来查询每个命令的执行时间<span id="more"></span>，不过不能进行统计归类(例如多条set 命令的执行情况会依次展示出来，没有统计功能)，并且 Pika 对各个命令的调用次数没有统计功能，只对总命令调用次数有统计功能。原因在于 Pika 没有实现 Redis 的 info Commandstats 命令，Redis 的这个命令可以统计各个命令的耗时情况以及调用次数(以微秒计)，Pika 也需要支持这个命令</p>
-<p>以下是 Redis 的 Info Commandstats:</p>
-<p>其中 cmdstat_set 是命令名称，calls(命令调用次数)，usec(命令耗时)，usec_per_call(命令平均执行时间)</p>
-<p><img src="https://beijing.xstore.qihu.com/geelib-base-online/%E6%88%AA%E5%B1%8F2023-07-0518.16.25_64a542ff15f8a.png" alt="截屏2023-07-05 18.16.25.png"></p>
-<h3 id="解决方案"><a href="#解决方案" class="headerlink" title="解决方案"></a>解决方案</h3><p>Pika 目前已经支持慢查询命令只是没有统计的功能，我们可以用慢查询里面的对单个命令耗时统计功能函数，而Pika 所有的命令都装在Cmd_table 里面，我们可以用一个结构体放在 Cmd 基类中，里面封装 calls，usec 这两个变量来实现对命令的统计功能，执行 info Commandstats 命令时我们对相应的 cmd 判断，如果里面的 calls 不为0 则展示其信息，避免对未调用过的命令进行不必要的展示。</p>
-<h3 id="关键代码改动"><a href="#关键代码改动" class="headerlink" title="关键代码改动"></a>关键代码改动</h3><h5 id="include-x2F-pika-command-h"><a href="#include-x2F-pika-command-h" class="headerlink" title="include&#x2F;pika_command.h"></a>include&#x2F;pika_command.h</h5><p><img src="https://beijing.xstore.qihu.com/geelib-base-online/%E6%88%AA%E5%B1%8F2023-07-0518.28.48_64a545e64ed75.png" alt="截屏2023-07-05 18.28.48.png"></p>
-<p>这里用 cmd_count 和 cmd_time_consuming 来统计对各个命令的总耗时和调用次数并初始化为 0，利用原子变量避免多线程安全问题.</p>
-<h5 id="src-x2F-pika-client-conn-cc"><a href="#src-x2F-pika-client-conn-cc" class="headerlink" title="src&#x2F;pika_client_conn.cc"></a>src&#x2F;pika_client_conn.cc</h5><p><img src="https://beijing.xstore.qihu.com/geelib-base-online/%E6%88%AA%E5%B1%8F2023-07-0519.24.16_64a552e6699a8.png" alt="截屏2023-07-05 19.24.16.png"></p>
-<p>这里的 c_ptr-&gt;Execute 是命令的执行函数，在执行完这个函数后我们对时间进行统计，这里我用的慢查询那边的函数把结果存在 duration 中，然后从 CmdTable 中给相应的 cmd 的 count 和 time_consuming 修改值，从而实现功能.</p>
-<h5 id="src-x2F-pika-admin-cc"><a href="#src-x2F-pika-admin-cc" class="headerlink" title="src&#x2F;pika_admin.cc"></a>src&#x2F;pika_admin.cc</h5><p><img src="https://beijing.xstore.qihu.com/geelib-base-online/%E6%88%AA%E5%B1%8F2023-07-0519.19.03_64a551abbb23d.png" alt="截屏2023-07-05 19.19.03.png"></p>
-<p>这个是命令本身的实现逻辑，利用 g_pika_cmd_table_manager-&gt;GetCmdTable() 返回一个 <code>&lt;std::string, std::unique_ptrcmd&gt;</code>的指针，遍历它判断每个命令的调用情况是否为 0，是的话跳过不打印，否则打印出相应信息并留小数点后两位。</p>
-<h4 id="实现情况"><a href="#实现情况" class="headerlink" title="实现情况"></a>实现情况</h4><p><img src="https://beijing.xstore.qihu.com/geelib-base-online/%E6%88%AA%E5%B1%8F2023-07-0519.28.14_64a55430184ad.png" alt="截屏2023-07-05 19.28.14.png"></p>
-<p>我们将慢查询的参数 <code>slowlog-log-slower-than</code> 设置为 0，来对每个命令的耗时进行查询，可见图中两次 set 的耗时分别是 140us 和 444us 两个值相加与我统计出来的 usec 的值 584 一样，平均耗时则为总耗时除以调用次数.</p>
-<p>相关 PR: <a target="_blank" rel="noopener" href="https://github.com/OpenAtomFoundation/pika/pull/1660">#1660</a></p>
-<p>相关 Issue:<a target="_blank" rel="noopener" href="https://github.com/OpenAtomFoundation/pika/issues/977">#977</a></p>
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