Java Memory Management on HP-UX

page 232/8/2005

Virtual Address Space Usage: Example 1

A) maxtsiz – 1GB (Upper limit for TEXT region)

B) maxdsiz – 1GB (Upper limit for DATA region)

Address space is reserved for TEXT and DATA in incremental

amounts as needed.

C) maxssiz – 400MB (Upper limit for STACK region, reserved upfront)

D) Java heap - -Xms1GB –Xmx1GB (Perm gen- 64MB default. Not

included in mx value.)

• New Size reserved: 357892096 initial: 357892096

• Old Size reserved: 715849728 initial: 715849728

• Perm Size reserved: 67108864 initial: 1048576

E) JVM Code Cache – 32MB

F) 300 threads in the application (300 * 512KB = 150MB)

Space left for the DATA (C-heap) region

Approximate (only significant, greater than 5MB, regions

shown in calculation)

2 GB – C – D – E – F - space consumed by TEXT