what is the use of -Xns option

Question

I found the following JVM argument in my working environment

-Xms12288m This specifies initial heap size

-Xmx12288m This specifies max heap size

one doubt here, If it reaches beyond this it will throw exception(Out of memory) ?

-Xns:3g what is this argument specifies?

Thanks in advance

It can't reach beyond this figure. Technically it can't even reach this figure because you have two survivor spaces and only one can be used at a time. — Peter Lawrey, May 19 '14 at 10:58

score 1 · Answer 1 · answered May 19 '14 at 10:48

Here you find theOracle doc for commandline options. this explains -Xns:

-Xns sets the nursery size. the JRockit JVM uses a nursery when the generational garbage collection model is used, that is, when the dynamic garbage collector has determined that the generational garbage collection model should be used or when the static generational concurrent garbage collector ( -Xgc : gencon) has been selected. You can also use -Xns to set a static nursery size when running a dynamic garbage collector (-XgcPrio).

score 1 · Answer 2 · edited May 23 '17 at 12:05

You can check out many options here : Which arguments stand for what in JVM memory options?

-Xns: sets the nursery size. the JRockit JVM uses a nursery when the generational garbage collection model is used, that is, when the dynamic garbage collector has determined that the generational garbage collection model should be used or when the static generational concurrent garbage collector ( -Xgc : gencon) has been selected. You can also use -Xns to set a static nursery size when running a dynamic garbage collector (-XgcPrio).

score 0 · Answer 3 · answered May 19 '14 at 11:24

0

Run java -X and it will print help on all available -X options

answered May 19 '14 at 11:24

Evgeniy Dorofeev

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what is the use of -Xns option

3 Answers3