Question about -XX:+PrintTenuringDistribution and age not being printed.

[John O'Brien]

Hi everyone,

I understand that :

1) par-new has features that make it work with CMS.
2) par-scavenge does not have these features and is incompatible with CMS.
3) Otherwise they are the same core algorithm...both parallel stop the
world copying collectors.

Why does PrintTenuringDistribution only print out the ages when ParNew
is enabled?
If they are the same algorithm then shouldn't they both print out age
? par-scavenge does not print "ages" for me when
PrintTenuringDistribution is on.

I use Parallel Old and Parallel Scavenge (ParNew can't be used with
Parallel Old).

Ref: https://blogs.oracle.com/jonthecollector/entry/our_collectors

I searched the mailing lists and did not see anything , read some
blogs and looked through some books.


Regards,
John