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Bug ID: JDK-7159766 Tiered compilation causes performance regressions
JDK-7159766 : Tiered compilation causes performance regressions

Details
Type:
Bug
Submit Date:
2012-04-06
Status:
Closed
Updated Date:
2013-03-26
Project Name:
JDK
Resolved Date:
2012-04-13
Component:
hotspot
OS:
linux
Sub-Component:
compiler
CPU:
x86
Priority:
P2
Resolution:
Fixed
Affected Versions:
7u4
Fixed Versions:
hs23 (b21)

Related Reports
Backport:
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Sub Tasks

Description
In 7u4 tiered compilation has been made default. We have seen mixed results in terms of performance in the testing we've done but the data has not been conclusive and has mostly pointed to very small regressions. In addition to that we've seen improvements in startup performance for several types of applications.

Over the last week we have received more reports from FMW performance testing that show (very) significant regressions. Many mid-sized workloads seem to work fine, but at least for some large ADF based workloads response times go up enough to cause test failures. The FMW performance team will recommend FMW/FA to turn off tiered compilation by explicitly disabling it.

In addition to this we've also seen regressions in startup time for short-lived applications.

                                    

Comments
EVALUATION

http://hg.openjdk.java.net/hsx/hsx23/hotspot/rev/34fce1d343b0
                                     
2012-04-07



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