JDK-8008290 : (profiles) Startup regression due to additional checking of JAR file manifests
  • Type: Bug
  • Component: core-libs
  • Sub-Component: java.util.jar
  • Priority: P3
  • Status: Closed
  • Resolution: Fixed
  • Submitted: 2013-02-15
  • Updated: 2013-04-12
  • Resolved: 2013-02-22
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JDK 8
8 b82Fixed
Related Reports
Relates :  
JDK-8003255 - (profiles) Update JAR file specification to support profiles
Relates :  
JDK-8001590 - NPG: Footprint increase when running Jetty
Description
This is a follow-up to JDK-8003255, where the original implementation to check the Profile attribute didn't include the optimization to avoid parsing the manifest when the word "profile" is not present in the manifest.
Comments
The following results are linux-x86 on a dual-core AMD Opteron 1220 @1.0 Ghz. footprint3_real / jetty comparing jdk8-b77 vs. jdk8-b78 and jdk8-b77 vs. TL (where TL = jdk8-b78 + fix for 8008290) $ compare logs.footprint3_real.b77 logs.footprint3_real.b78 ============================================================================== logs.footprint3_real.b77: Benchmark Samples Mean Stdev Geomean Weight footprint3_real 20 39117.40 304.60 ============================================================================== logs.footprint3_real.b78: Benchmark Samples Mean Stdev %Diff P Significant footprint3_real 20 52898.20 2278.55 -35.23 0.000 Yes ============================================================================== $ compare logs.footprint3_real.b77 logs.footprint3_real.tl ============================================================================== logs.footprint3_real.b77: Benchmark Samples Mean Stdev Geomean Weight footprint3_real 20 39117.40 304.60 ============================================================================== logs.footprint3_real.tl: Benchmark Samples Mean Stdev %Diff P Significant footprint3_real 20 40166.00 416.07 -2.68 0.000 Yes ============================================================================== startup3 / jetty comparing jdk8-b77 vs. jdk8-b78 and jdk8-b77 vs. TL (where TL = jdk8-b78 + fix for 8008290) $ compare logs.startup3.b77 logs.startup3.b78 ============================================================================== logs.startup3.b77: Benchmark Samples Mean Stdev Geomean Weight startup3 100 0.74 0.05 ============================================================================== logs.startup3.b78: Benchmark Samples Mean Stdev %Diff P Significant startup3 100 1.00 0.07 -35.84 0.000 Yes ============================================================================== $ compare logs.startup3.b77 logs.startup3.tl ============================================================================== logs.startup3.b77: Benchmark Samples Mean Stdev Geomean Weight startup3 100 0.74 0.05 ============================================================================== logs.startup3.tl: Benchmark Samples Mean Stdev %Diff P Significant startup3 100 0.77 0.04 -5.10 0.000 Yes ============================================================================== There is still a small regression at startup, this is due to the number of JAR files that Jetty opens (334) so more work may be required if this benchmark is important.
22-02-2013