LegoJenniferInstanceDistribution

Aim

Examine the type of distribution which the frequency of the number of instances follows in java programs

Hypothesis

The distribution will be a power law

Method

1. HAT is used to obtain the number of instances in the hprof files of the following (found in /vol/elvis/HeapCorpus?):

  Aglets.hprof    Bloat.hprof
  AlgebraDB?.hprof Denim.hprof
  GJ.hprof        HyperJ?.hprof 
  JAX.hprof       Kawa.hprof
  Satin.hprof     SableCC?.hprof
  Soot.hprof      Tomcat.hprof

2. It is calculated how many instances are created 0 times, how many created 1 time, how many created 2 times etc.

3. The results are all put into one datafile and MATLAB is used to determine the distribution.

Results

The [datafile] produces the following:

• The number of bins used in the diagnosis of logNormals: 10

Conclusion

According to the EVENTS RANKED BY FREQUENCY graph, the distribution may follow a power law.