Rapid Memory Growth In Heap Is Been Seen With Oracle iPlanet Web Server Process

(Doc ID 2113576.1)

Last updated on APRIL 06, 2017

Applies to:

Oracle iPlanet Web Server - Version 7.0 and later
Oracle Solaris on SPARC (32-bit)
Oracle Solaris on x86-64 (64-bit)
Oracle Solaris on SPARC (64-bit)
Oracle Solaris on x86 (32-bit)


iPlanet web server process continuously grows and never stabilizes even after load has been reduced to minimum. Using Solaris mdb utility to analyze the process (or the core dump from running gcore) we see that there is a huge gap between the "memory in use" and "memory total" for the sbrk_top. The sbrk_top arena holds all controlled memory.

For example, in below example of "::umastat" output, the memory in use - the memory is actually being used by the web server, is about 300M (320356352 bytes), but the total memory held in sbrk_top, manifested in the total size of the iPlanet web server process (see pmap output below) , is about 4G (4451893248 bytes)!!



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