More memory-efficient internal representation for Strings: call for more data

[Aleksey Shipilev]

Hi,

As you may already know, we are looking into more memory efficient
representation for Strings:
 https://bugs.openjdk.java.net/browse/JDK-8054307

As part of preliminary performance work for this JEP, we have to collect
the empirical data on usual characteristics of Strings and char[]-s
normal applications have, as well as figure out the early estimates for
the improvements based on that data. What we have so far is written up here:
 http://cr.openjdk.java.net/~shade/density/string-density-report.pdf

We would appreciate if people who are interested in this JEP can provide
the additional data on their applications. It is double-interesting to
have the data for the applications that process String data outside
Latin1 plane. Our current data says these cases are rather rare. Please
read the current report draft, and try to process your own heap dumps
using the instructions in the Appendix.

Thanks,
-Aleksey.