What are the different parts of the heap specified in the hs_err_pid file?

Question

Below is a part of the hs_err_pid

Heap
 PSYoungGen      total 13888K, used 9807K [0x8a330000, 0x8b140000, 0x914f0000)
  eden space 13504K, 69% used [0x8a330000,0x8ac67710,0x8b060000)
  from space 384K, 96% used [0x8b0e0000,0x8b13c6e0,0x8b140000)
  to   space 448K, 0% used [0x8b060000,0x8b060000,0x8b0d0000)
 PSOldGen        total 115456K, used 57684K [0x514f0000, 0x585b0000, 0x8a330000)
  object space 115456K, 49% used [0x514f0000,0x54d451c0,0x585b0000)
 PSPermGen       total 16384K, used 11253K [0x4d4f0000, 0x4e4f0000, 0x514f0000)
  object space 16384K, 68% used [0x4d4f0000,0x4dfed618,0x4e4f0000)

What are

1. PSYoungGen
2. eden space (from space, to space)
3. PSOldGen
4. PSPermGen (object space)

Answer 1

These are the memory regions used by the garbage collector.

See the memory management whitepaper from Sun (PDF) for more details.