PI Max Java Heap Configuration

[suwandi_cahyadi]

Dear Experts,

I know that the suggested maximum Java Heap configuration is 4Gb.

I want to really know the impact if I set it to 8Gb, has anyone tried this before? Will this have serious impact?

Thank you,

Suwandi C.

[former_member184720 · Accepted solution]

Hi Suwandi - Any perticular reason to increase the heap space? are you facing any errors?

Can you check the SAP note 723909 - Java VM settings for J2EE 6.40/7.0 ?

I'm not a basis expert but i see that

For 64 bit platforms (that means not only your OS but also your JDK supports 64 bit) we recommend using 2GB: -Xmx2048m  -Xms2048m

The max heap size (plus max perm size) of all Java server nodes must fit completely into the physical memory in order to avoid heavy paging on OS level. You must also consider the space needed for OS and other processes.

For each JavaVM on the server, all Java memory must fit completely into physical memory

[junwu]

what's the version of your pi?

if it is 64 bit, go with 8g, no issue.

[suwandi_cahyadi]

Hi Jun Wu,

Thank you for the reply.

PI version is 7.1 installed in AIX 6.1

Based on your experience, setting the heap to 8Gg, will the GC process still at a tolerable time? When Java is in GC process will the daily interfaces could still be processed?

Thank you,

Suwandi C.