SAP Note #723909 Clarification needed: 2G heap for server nodes
We mare upgrading from Enterprise 4.7 to ERP 6.0 SP12. For our ESS/MSS we will use standalone Java NW 7.0 SP14 with XSS SP12. Our portal servers and ERP ABAP are Unix Solaris 9 or 10 64-bit. The portal servers are 4CPU x 16G. We use three server nodes on our central instance and three server nodes on our dialog instance. All server nodes have 2G heap.
Recent load tests indicate we are reaching memory limits in the server nodes. THis causes frequent full GC with tenured objects deleted (very time consuming). We want to increase heap size > 2GB. Note 723909 seems to say this can be done for 64-bit systems, but SAP appears to recommend additional server nodes with 2G heap. I think this is because of GC performance with large heap.
- Are we supported with heap > 2G?
- Are there still concerns with GC when heap > 2G?
- Are there other reasons why heap should be no higher than 2G?
Thanks in advance
- Are we supported with heap > 2G?
- Are there still concerns with GC when heap > 2G?
- Are there other reasons why heap should be no higher than 2G?
You´ve answered your questions yourself
To have a fast J2EE engine you need to absolutely make sure all the heap is covered in physical memory. No swapping should take place at all. Once the system starts swapping in and out, you will loose a lot of performance.
How big is your Oracle SGA? If you can decrase it so all the heaps (+ dispatcher heap) will fit in physical memory you can increase more. We use 2.5 - 3 GB heap (for BI) with three server nodes.
Markus
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