I think the answer is it depends.

How much memory is available - as I recall JAVA can take it all

In OMVS - Ua -limit

core file 8192b 
cpu time 85835 
data size unlimited 
file size unlimited 
stack size unlimited 
file descriptors 64000 
address space 1657832k 
memory above bar 2048m 


from MVS Console - D OMVS,LIMIT

OMVS 0011 ACTIVE OMVS=(00) 
SYSTEM WIDE LIMITS: LIMMSG=NONE 
CURRENT HIGHWATER SYSTEM 
USAGE USAGE LIMIT 
MAXPROCSYS 200 259 2100 
MAXUIDS 26 31 500 
MAXPTYS 0 1 800 
MAXMMAPAREA 8428 8428 40960 
MAXSHAREPAGES 47918 254576 32768000 
IPCMSGNIDS 17 20 500 
IPCSEMNIDS 11 21 2000 
IPCSHMNIDS 3 6 500 
IPCSHMSPAGES 0 26 786432 
IPCMSGQBYTES --- 7812 2147483647 
IPCMSGQMNUM --- 2 10000 
IPCSHMMPAGES --- 256 12800 
SHRLIBRGNSIZE 111149056 111149056 444596224 
SHRLIBMAXPAGES 0 0 65536 
MAXUSERMOUNTSYS 0 0 0 
MAXUSERMOUNTUSER 0 0 0 
MAXPIPES 59 170 15360


So depending on how many processes you are going to run, what type of code - 
simple or complex

JAVA could take as much as you can give it

Do you have a specific issue you are trying to resolve?

Lizette


-----Original Message-----
From: IBM Mainframe Discussion List <IBM-MAIN@LISTSERV.UA.EDU> On Behalf Of 
Peter
Sent: Friday, July 17, 2020 9:30 AM
To: IBM-MAIN@LISTSERV.UA.EDU
Subject: Java memory limit

Hello

We are running IBM RDZ on zOS 2.3 with java 6. What's the maximum memory limit 
for java ? Is it based on Java version or zOS version ?

Peter

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