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The 32-bit JDK can only have a process address space of 4096M (16 segments) and some of these segments are reserved.

Segment Count

Segment MB

GCHMAX Value

1

256

262144

2

512

524288

3

768

786432

4

1024

1048576

5

1280

1310720

6

1536

1572864

7

1792

1835008

8

2048

2097152

9

2304

2359296

10

2560

2621440

11

2816

2883584

12

3072

3145728

13

3328

3407872

…



16

4096

4194304

…



20

5120

5242880

…



24

6144

6291456

…



915

234240

239861760

From experimentation, these are the maximum GCHMAX values for IBM Java Technology for Java JDK's.

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