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Percona Thread Pool性能基准测试

Jun 07, 2016 pm 04:42 PM
pool thread performance test

MySQL从5.5.16开始,在MySQL的商业化版本中将Thread Pool作为plugin提供官方功能支持。后来MariaDB也实现了这一功能,Percona也跟进实现了。从这几天对Percona 5.6.16版本做了下thread pool对比测试,试图找到较为合适的配置参数。 下面是几个测试模式对比:

MySQL从5.5.16开始,在MySQL的商业化版本中将Thread Pool作为plugin提供官方功能支持。后来MariaDB也实现了这一功能,Percona也跟进实现了。从这几天对Percona 5.6.16版本做了下thread pool对比测试,试图找到较为合适的配置参数。

下面是几个测试模式对比:

模式 配置参数

Percona 5.6.16-nothp 未开启 thread pool 模式

CASE0-thp(128)-oversub(16)-max(2048) thread_handling = pool-of-threads
thread_pool_size = 128
thread_pool_oversubscribe = 16
thread_pool_max_threads = 2048

CASE1-thp(default) thread_handling = pool-of-threads
其他默认设置

CASE2-thp(default)-oversub(10) thread_handling = pool-of-threads
thread_pool_oversubscribe = 10
其他默认设置

CASE3-thp(default)-oversub(10)-max(10000) thread_handling = pool-of-threads
thread_pool_oversubscribe = 10
thread_pool_max_threads = 100000
其他默认设置

CASE4-thp(default)-oversub(16) thread_handling = pool-of-threads
thread_pool_oversubscribe = 16
其他默认设置

CASE5-thp(128)-oversub(16)-max(100000) thread_handling = pool-of-threads
thread_pool_size = 128
thread_pool_oversubscribe = 16
thread_pool_max_threads = 100000

仍然采用tpcc-mysql这个测试工具,基准值:

测试Warehouse数: 100

warmup time: 60s

run time: 1200s

并发线程数: 64 ~ 1920

测试环境信息:

测试机 DELL PE R710

CPU E5620 @ 2.40GHz(4 core, 8 threads, L3 Cache 12 MB) * 2

内存 32G(4G * 8)

RAID卡 PERC H700 Integrated, 512MB, BBU, 12.10.1-0001

系统 Red Hat Enterprise Linux Server release 6.4 (Santiago)

内核 2.6.32-358.el6.x86_64 #1 SMP

raid级别 raid 0

文件系统 xfs

硬盘 SSD: Intel 520系列SSD, 800G * 1

Percona版本号:5.6.16-64.2-rel64.2-log Percona Server with XtraDB (GPL), Release rel64.2, Revision 569,Percona相关的关键配置有:

innodb_buffer_pool_size = 26G

innodb_flush_log_at_trx_commit = 1

测试脚本可参考:MySQL压力测试经验

测试结果见下:

 

Percona-Thread-Pool测试-20140701.png

 

针对这个测试结果,我们可以得到一些结论:

 

1、通常地,只需要开启 pool-of-threads 模式就可以;

2、可以根据实际压力情况,适当调整 thread_pool_oversubscribe 选项以提升 TPS,这个选项值设置范围一般在 3~20;

3、thread-pool-size默认值是逻辑CPU个数,最大值是 128,不建议调整或显式设置,如果显式设定 thread-pool-size 的值,可能会带来反效果;

4、thread_pool_max_threads 默认值是 100000,强烈不建议修改。

综上,对于Thread Pool,我们一般建议设置下面2个选项就足够了:

thread_handling = pool-of-threads

thread_pool_oversubscribe = 10 #这个值建议在3~20间,不清楚的话,无需设置

备注:启用Thread Pool后,想要终止某个查询的话,要这么写KILL QUERY connection_id,,而不是写成 KILLconnection_id,否则就会导致整个连接被KILL。

如果还有什么问题,欢迎加入我的QQ群(272675472)讨论。

 


 

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