I ran the code coverage for multiple jvms. Summary is as following:
 
Environment
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- sun jdk131
- sun jdk142
- sun jdk15
- OS: Windows 2000
- trunk - svn revision no. 373975

Code Coverage Summary
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OVERALL COVERAGE SUMMARY
Classes:  92%  (1106/1196)
Methods: 75%  (15338/20367)
Blocks:    72%  (474503/656406)
Lines:      72%  (97248.4/134695)

OVERALL STATS SUMMARY
total packages: 79
total executable files: 1144
total classes: 1196
total methods: 20367
total executable lines: 134695

After comparing the code coverage results for multiple jvms (sun jdk131, sun jdk142, sun jdk15) vs one jvm (sun jdk142) for svn revision 373975, the findings are following:-

Classes coverage:  class coverage remained same.
Method coverage: method coverage increased by 26 methods.
Block Coverage:  block coverage increased by 637 blocks.
Line Coverage: line coverage increased by 145 lines.

--
Ramandeep Kaur
ramandhindsa@gmail.com