Case study: How to leverage +LargePages option of J2SE1.5 on Linux hugemem kernel for 11i Oracle Applications java servlet based modules

                                        11i java performance:

This case study deals with Oracle configurator product (shortcode CZ)
of 11i Oracle Applications and how to make it more stable and scalable
by leveraging the LargePages option provided in J2SE1.5. This paper is in continuation to earlier article Common Incorrect beliefs about process address limits on 32bit platforms

It is assumed that the maintenance release of 11i Oracle Applications is 11.5.10 as per certification specified in Note 304099.1 - Using J2SE Version 5.0 with Oracle E-Business Suite 11i. To find the latest version of Java certified with the E-Business
Suite application tier, please see OracleMetaLink Note
300482.1,
titled "Overview of Using Java with Oracle E-Business
Suite Release 11i
".

This study assumes RHAS3 as the running platform OS.

The advantage of using largepages is that the heap memory will be
locked and is not eligible for paging out on swap. The access of
objects in heap in real memory is obviously faster.

Hence,
using Largepages option is a good option  for achieving performance
goals, especially when the caching demands in the servlet are
considerable and there is a section of RAM on the machine running
servlet, which is not being put to any use.

Read the entire Story here..


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