容量规划工具

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