- 业务指标
- 业务响应时间（Response Time）：这个指标所有相关人员都明白其含义，业务部门更需要此指标的具体值，一般情况下，不同系统的业务响应时间期望值是不同的，建议１秒以内。像淘宝系统业务RT基本在几十毫秒以内。
- 业务处理能力（Transaction Per Second）：具体指标为TPS（Transaction Per Second，即系统每秒处理事务数），这个指标是衡量系统的处理能力的一个非常重要的指标。TPS可以参照同行业系统和结合具体业务，中小企业TPS值为50~1000笔/秒，银行TPS值为1000~50000笔/秒，淘宝TPS值为30000~300000笔/秒。
- 成功率：这个指标是衡量系统处于压力下，业务的成功率，一般业界成功率要大于99.6%。
- 资源指标
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振动测试基础知识：采集仪的关键技术指标简介
根据采样定理,若信号频率大于采样频率的一半时将产生混叠。若信号产生混叠,根据混叠机理,可以得出分析信号的混叠频率计算公式,设实际信号频率为f s ,采样频率为SF,并且SFf,经采样分析得到的混叠后频率为f a ,则有如下公式:
9 抗混叠滤波及衰减指标
关联阅读: A 采样定理详解:3个主要条件只需满足其中任意2个 B 模态分析的发展以及面向试验模态分析的数据采集 C 数据采集(DAQ)基础知识:重要准则和通用术语 D 数据采集系统校准和模态振型归一化为何重要?
性能测试技术指南
- 业务指标
- 业务响应时间（Response Time）：这个指标所有相关人员都明白其含义，业务部门更需要此指标的具体值，一般情况下，不同系统的业务响应时间期望值是不同的，建议１秒以内。像淘宝系统业务RT基本在几十毫秒以内。
- 业务处理能力（Transaction Per Second）：具体指标为TPS（Transaction Per Second，即系统每秒处理事务数），这个指标是衡量系统的处理能力的一个非常重要的指标。TPS可以参照同行业系统和结合具体业务，中小企业TPS值为50~1000笔/秒，银行TPS值为1000~50000笔/秒，淘宝TPS值为30000~300000笔/秒。
- 成功率：这个指标是衡量系统处于压力下，业务的成功率，一般业界成功率要大于99.6%。
- 资源指标
- 已上线系统
- 搜集生产上不同高峰时间段的业务种类和业务量，每个时间段的业务种类和业务量是否有很大的差异，如有的话，必须有多个业务模型，差异不大的，可以只用一个业务模型。
- 搜集生产上高峰时间段资源消耗和资源异常的时间点，从中捕获资源消耗高和异常的原因，可能是由于某种”不起眼”的业务导致。
- 搜集生产问题，进行分析，如果是由于某种业务导致而且以前性能测试的时候忽略此笔业务，那么这笔业务的风险是非常大的，需要后续性能测试将此业务加入到业务模型中。
- 未上线系统
- 通过调研，确定业务种类和业务占比。
- 通过调研，确定是否在业务促销等活动中，某些业务有突变的可能。
- 通过测试结果，确定每笔业务的资源消耗，如果某些业务虽然占比低，但资源消耗非常大，那么需要适当的调整此业务占比。
数据量主要包括基础数据量（或者叫历史数据量、垫底数据量、数据库中已有的数据量）和参数化数据量，数据量在性能测试中起到非常重要的作用。 对于在数据库中只有几条记录和有几亿条记录里面查询信息，那么结果肯定相差非常大的。随着业务量的增长，记录也越来越多，因此使用性能测试环境时，需要保持跟生产上相同级别的数据量。如果采用在生产环境中插入测试账户的方式，可以一定程度解决环境真实性和基础数据量同量级的问题。 阿里全链路压测的方式对于基础数据量的要求和上述类似。 然后，我们在测试的时候需要考虑参数数据量的大小和数据分布的问题。
如果基础数据量跟生产环境的基础数据量不在同一个数量级上，将会导致相关指标例如响应时间比生产上快很多，不真实，甚至导致测试结果没有参考意义。 如果参数化数据量过少、未考虑数据分布的情况，将会导致测试结果不真实，甚至测试结果没有参考意义。 生产环境中插入测试账户的方式，需要考虑数据准备的完整性问题，还有清理的逻辑需要完整。 全链路压测的方式需要投入较大的改造成本，同时包括后续的持续迭代维护。
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