容量规划工具

liangjz

1 开源
  java model tool
  pdq

2 借用定律

A
  little's  law
             N = X * R

N = Number of requests in the system
X = Throughput
R = Response Time

B  Utilization law

U = X * S

U = Utilization
X = Throughput
S = Service Time

c Stretch Factor

Stretch Factor=1/ (1-U) =response time/service time

where U is the utilization of the server.
The analytic formula for estimating stretch factor assumes the following:
There are an infinite number of customers
The arrival times are exponentially distributed
The service times are exponentially distributed


3 商业工具
teamquest，国外SUN 公司、国内广东电信研究院用
bmc performance assurance，上海电信研究院用
原来Mercury工具也和一厂商有容量规划工具的合作的现在没有了

其他的请各位朋友补充

liangjz

实际上sun公司和广东电信，容量规划工具和性能测试过程结合用的