Header size with -XX:-UseCompressedOops

[Stefan Reich]

Hi, quick question to the experts.

Java object header size is 12 bytes with CompressedOOPS (have verified this
many times).

Now I did a test with -XX:-UseCompressedOops just for fun and found that
headers are still 12 bytes?

I verified this in two ways:

a. using Unsafe.objectFieldOffset
b. making a whole lot of identical objects and measuring heap use before
and after (with calls to System.gc)

Both these methods give me a size of 16 bytes for an object with a single
int field.

How is this possible?

Many greetings
Stefan Reich

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