Garbage Collection on Java Process Shows Error "concurrent mode failure"

(Doc ID 551515.1)

Last updated on NOVEMBER 05, 2016

Applies to:

Oracle Containers for J2EE - Version to [Release AS10gR3]
Information in this document applies to any platform.
***Checked for relevance on 22-Apr-2013***
***Checked for relevance on 08-DEC-2014***


Find that an application gets very slow when garbage collection cannot finish in time. It starts retrying and this causes the instance to slow down. Java garbage collection parameters have already been tweaked, and for garbage collection reporting, also "-verbose:gc -XX:+PrintGCDetails -XX:+PrintGCTimeStamps" are set. The logfile / output file of OC4J shows following entry:

395390.170: [GC 395390.170: [DefNew (promotion failed): 707840K->707840K(707840K), 26.6475128
secs]395416.818: [CMS395418.585: [CMS-concurrent-abortable-preclean: 4.327/44.770 secs]
(concurrent mode failure): 262144K->262143K(262144K), 14.1837441 secs]
863648K->375462K(969984K), 40.8324019 secs]


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