JDK-8171294 : Slow compilation with long classpaths under JDK 9
  • Type: Bug
  • Component: tools
  • Sub-Component: javac
  • Affected Version: 9
  • Priority: P3
  • Status: Closed
  • Resolution: Fixed
  • Submitted: 2016-12-15
  • Updated: 2017-03-01
  • Resolved: 2017-02-01
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JDK 10 JDK 9
10Fixed 9 b156Fixed
Related Reports
Relates :  
JDK-8150641 - Repeated compilation with a long classpath significantly slower on JDK 9
Relates :  
JDK-8162492 - JDK 9 javac still slower than JDK 8 for repeated compilation
Description
Compilations with long classpaths and many references to symbols in the classpath cause javac to make many calls to Files.exist, and for the cache in ArchiveContainer to retain a large number of entries.

see: http://mail.openjdk.java.net/pipermail/compiler-dev/2016-December/010596.html

Repro:

1) generate the test inputs

$ javac -cp asm.jar Test.java && java -cp asm.jar:. Test

2) compile

$ $JAVAC8 -fullversion
javac full version "1.8.0_122-ea-b04"
$ time $JAVAC8 @params.txt
real 0m17.385s
user 0m40.855s
sys 0m1.305s

$ $JAVAC9 -fullversion
javac full version "9-ea+148"
$ time $JAVAC9 @params.txt
real 8m40.530s
user 32m8.614s
sys 0m57.024s