TPS/QPS/RT的关系及计算

Posted 2023-04-06

参考技术A

如果是对一个查询接口（单场景）压测，且这个接口内部不会再去请求其它接口，那么tps=qps，否则，tps不等于qps

jmeter聚合报告中，Throughput是用来衡量请求的吞吐量，也就是tps
tps=样本数/运行时间，
样本数即并发请求数，
运行时间=RT(响应时间)+tt（思考时间，think time）
即 Tps=并发数/(RT+tt)

eg1:100并发，RT0.2S，tt不控制=0，那么Tps=100/0.2=500tps

eg2:100并发，RT0.2S，如果使用Throughput Shaping Timer自动控制tt，即tt=0.8s，那么Tps=100/(0.2s+0.8s)=100tps

TPS/QPS

有很多人，自己TPS和QPS的关系都搞不清。
如下为基本的查询方式是，与计算公式！ 拿走不谢！

MariaDB [(none)]> show global status like ‘questions‘;
+---------------+----------+
| Variable_name | Value |
+---------------+----------+
| Questions | 70991770 |
+---------------+----------+
1 row in set (0.00 sec)

MariaDB [(none)]> show global status like ‘uptime‘;
+---------------+--------+
| Variable_name | Value |
+---------------+--------+
| Uptime | 485352 |
+---------------+--------+
1 row in set (0.00 sec)

Questions/ Uptime
QPS：146

MariaDB [(none)]> show global status like ‘com_commit‘;
+---------------+---------+
| Variable_name | Value |
+---------------+---------+
| Com_commit | 8960761 |
+---------------+---------+
1 row in set (0.00 sec)

MariaDB [(none)]> show global status like ‘com_rollback‘;
+---------------+-------+
| Variable_name | Value |
+---------------+-------+
| Com_rollback | 117 |
+---------------+-------+
1 row in set (0.00 sec)

MariaDB [(none)]> show global status like ‘uptime‘;
+---------------+--------+
| Variable_name | Value |
+---------------+--------+
| Uptime | 485432 |
+---------------+--------+
1 row in set (0.00 sec)

Com_commit + Com_rollback / Uptime
TPS：18