jvm - Where is Java PERM generation? -

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when start jvm perm gen allocated? part of main heap or in addition heap size.

for example if use following parameters:

-server -xms10g -xmx10g -xx:maxpermsize=1536m

is total size of java going 6g + 512m or 6.5g java or perm generation setup inside of heap meaning running application have 6g - 512m = 5.5mb young / tenured(aka old) , perm?

this graphic in 4. sizing generations seems imply may outside of heap can't seem find states sure. http://www.oracle.com/technetwork/java/javase/gc-tuning-6-140523.html

looking @ output jstat seem on outside of main heap may way reported.

[jboss@pts03-taps-03 ~]$ jstat -gccapacity pid    ngcmn    ngcmx     ngc     s0c   s1c       ec      ogcmn      ogcmx       ogc         oc      pgcmn    pgcmx     pgc       pc     ygc    fgc     85184.0  85184.0  85184.0 8512.0 8512.0  68160.0 10400576.0 10400576.0 10400576.0 10400576.0  21248.0 1572864.0 1387840.0 1387840.0    431    43   ogcmx = 10400576.0  (almost 10g old gen)   ngcmx = 85184.0  (ogcmx + ngcmx = close 10g new gen) pgcmx = 1572864.0  (1.5g perm gen)

if possible please provide link documentation showing case true.

-server -xms10g -xmx10g -xx:maxpermsize=1536m

the total of heap , perm gen going 11.5 gb. there other areas of memory, e.g. direct memory can big. area shared libraries fixed size.

e.g. can set

-mx128m -xx:maxpermsize=1g

if perm gen insize heap fail.


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