[转帖]tidb-系统内核调优及对比

一、背景

验证系统调优对性能的影响，用sysbench做了一些简单的测试，具体调整方法可见官方文档

二、特殊说明

1.透明大页查看

# 查看透明大页是否开启，[]在always处表示开启，[]在never处表示关闭
cat /sys/kernel/mm/transparent_hugepage/enabled
always madvise [never]

2.io查看

io调度方式需要看磁盘类型是否支持，只有ssd和hdd的才能够支持noop的调度方式，具体可以看大佬的文章

三、结果对比

初步关闭了大页之后性能有5%左右的提升，但是因为测试环境比较差，测试内容不一定准确

 1:
    transactions:                        2428   (40.45 per sec.)
    queries:                             48560  (809.03 per sec.)

2:

transactions:                        3816   (63.57 per sec.)

queries:                             76320  (1271.34 per sec.)

4:
transactions:                        <span class="token number">5851</span>   <span class="token punctuation">(</span><span class="token number">97.47</span> per sec.<span class="token punctuation">)</span>
queries:                             <span class="token number">117020</span> <span class="token punctuation">(</span><span class="token number">1949.30</span> per sec.<span class="token punctuation">)</span>

8:

transactions:                        6918   (115.23 per sec.)

queries:                             138360 (2304.62 per sec.)
16:

transactions:                        8089   (134.54 per sec.)

queries:                             161780 (2690.83 per sec.)
32:
transactions:                        <span class="token number">9120</span>   <span class="token punctuation">(</span><span class="token number">151.51</span> per sec.<span class="token punctuation">)</span>
queries:                             <span class="token number">182400</span> <span class="token punctuation">(</span><span class="token number">3030.21</span> per sec.<span class="token punctuation">)</span>

64:
transactions:                        <span class="token number">9153</span>   <span class="token punctuation">(</span><span class="token number">151.65</span> per sec.<span class="token punctuation">)</span>
queries:                             <span class="token number">183060</span> <span class="token punctuation">(</span><span class="token number">3032.96</span> per sec.<span class="token punctuation">)</span>

调整大页等参数后

1:

transactions:                        2599   (43.30 per sec.)

queries:                             51980  (865.99 per sec.)
2:
transactions:                        <span class="token number">4097</span>   <span class="token punctuation">(</span><span class="token number">68.24</span> per sec.<span class="token punctuation">)</span>
queries:                             <span class="token number">81940</span>  <span class="token punctuation">(</span><span class="token number">1364.88</span> per sec.<span class="token punctuation">)</span>

4:
transactions:                        <span class="token number">6166</span>   <span class="token punctuation">(</span><span class="token number">102.70</span> per sec.<span class="token punctuation">)</span>
queries:                             <span class="token number">123320</span> <span class="token punctuation">(</span><span class="token number">2054.04</span> per sec.<span class="token punctuation">)</span>

8:
transactions:                        <span class="token number">8865</span>   <span class="token punctuation">(</span><span class="token number">147.62</span> per sec.<span class="token punctuation">)</span>
queries:                             <span class="token number">177300</span> <span class="token punctuation">(</span><span class="token number">2952.45</span> per sec.<span class="token punctuation">)</span>

16:
transactions:                        <span class="token number">9705</span>   <span class="token punctuation">(</span><span class="token number">161.57</span> per sec.<span class="token punctuation">)</span>
queries:                             <span class="token number">194100</span> <span class="token punctuation">(</span><span class="token number">3231.44</span> per sec.<span class="token punctuation">)</span>

32:
transactions:                        <span class="token number">9805</span>   <span class="token punctuation">(</span><span class="token number">163.09</span> per sec.<span class="token punctuation">)</span>
queries:                             <span class="token number">196100</span> <span class="token punctuation">(</span><span class="token number">3261.73</span> per sec.<span class="token punctuation">)</span>

64:
transactions:                        <span class="token number">10055</span>  <span class="token punctuation">(</span><span class="token number">166.87</span> per sec.<span class="token punctuation">)</span>
queries:                             <span class="token number">201100</span> <span class="token punctuation">(</span><span class="token number">3337.38</span> per sec.<span class="token punctuation">)</span>

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