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go 配置 mysql 连接池
mysql 配置文档
max-connections=10000
代码
orm
1.ab 发起并发请求测试
-c: 并发量 100
-n: 总请求量 300
➜ ~ ab -c 100 -n 300 http://localhost:8080/pool
This is ApacheBench, Version 2.3 $Revision: 1826891 $
Copyright 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/
Licensed to The Apache Software Foundation, http://www.apache.org/
Benchmarking localhost (be patient)
Completed 100 requests
Completed 200 requests
Completed 300 requests
Finished 300 requests
Concurrency Level: 100
Time taken for tests: 4.073 seconds
Complete requests: 300
Failed requests: 0
Total transferred: 128400 bytes
HTML transferred: 91200 bytes
Requests per second: 73.66 [#/sec] (mean)
Time per request: 1357.601 [ms] (mean)
Time per request: 13.576 [ms] (mean, across all concurrent requests)
Transfer rate: 30.79 [Kbytes/sec] received
Connection Times (ms)
min mean[+/-sd] median max
Connect: 0 2 2.2 1 8
Processing: 1001 1012 8.2 1010 1036
Waiting: 1001 1012 8.1 1010 1036
Total: 1002 1014 9.5 1012 1043
Percentage of the requests served within a certain time (ms)
50% 1012
66% 1016
75% 1019
80% 1021
90% 1031
95% 1035
98% 1039
99% 1040
100% 1043 (longest request)
➜ ~
2.PoolHandler 中触发 sql 查询
设置空闲连接为 10 个
最大可以打开的连接为 10 个 mysql.conf 中可以修改最大连接数.
db/db.go
sqlDB.SetMaxIdleConns(10)
// SetMaxOpenConns 设置打开数据库连接的最大数量。sqlDB.SetMaxOpenConns(10)
// SetConnMaxLifetime 设置了连接可复用的最大时间。sqlDB.SetConnMaxLifetime(time.Hour)
controller/pool.go
func PoolHandler(c *gin.Context) {time.Sleep(time.Second)
var user model.User
tx := db.DB.Raw(SELECT id, name, age FROM users WHERE name = ? limit 1 , D42).Scan(user)
if tx.Error != nil {panic(tx.Error)
logger.Debugf(raw sql id:%v name:%v age:%v , user.ID, user.Name, user.Age)
c.JSON(200, user)
}
3. 查看测试过程中请求 mysql 创建的请求
SHOW PROCESSLIST;
Id User Host db Command Time State Info
8 root localhost:51148 demo_go Query 0 starting SHOW PROCESSLIST
900 root localhost:64598 demo_go Sleep 0
901 root localhost:64754 demo_go Sleep 0
902 root localhost:64755 demo_go Sleep 0
903 root localhost:64756 demo_go Sleep 0
904 root localhost:64757 demo_go Sleep 0
905 root localhost:64758 demo_go Sleep 0
906 root localhost:64759 demo_go Sleep 0
907 root localhost:64760 demo_go Sleep 0
908 root localhost:64761 demo_go Sleep 0
909 root localhost:64762 demo_go Sleep 0
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