JDK-7143341 : +TieredCompilation regression on 7u4-b10 on Solaris
  • Type: Bug
  • Component: hotspot
  • Sub-Component: compiler
  • Affected Version: 7u4
  • Priority: P3
  • Status: Closed
  • Resolution: Duplicate
  • OS: solaris_11
  • CPU: sparc
  • Submitted: 2012-02-07
  • Updated: 2013-05-31
  • Resolved: 2013-05-31
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Observing a performance regression with 7u4-b10 with +TieredCompilation

EVALUATION Part II Code cache sweeper must yield to safepoint. With high numbers of methods sweeping can block the safepoint from happening. See CR 7145345.

EVALUATION The regression seems to have many parts: Part 1 Most of the regression was caused by Parallel Scavenger not cleaning up the scavenge roots in code list after young GCs. In addition it's more profitable to promote the objects directly pointed by the code immediately instead of ping-ponging them in the survivor spaces, this will also allow to cleanup the roots in code list as soon as possible. This will be fixed in 7144296: PS: Optimize nmethods processing

WORK AROUND Disable tiered comilation, -XX:-TieredCompilation