compiling Jigsaw (to get it to compile, we need to comment out the boundariesCrossed++ in ASTNode.getParent(), and avoid flushing the arrayType$computed flag in TypeDecl.flushCache())

non-incremental JastAddJ:
  0m21.79s
  0m35.75s
  0m 1.41s

  maximum heap size about 600M

incremental JastAddJ without any optimisations:
  28m 6.68s
  28m44.01s
   0m 4.21s

  number of AST nodes: 1,514,712
  number of memolines: 5,023,193
  total number of dependencies: 30,901,433
  number of dependencies on library: 9,933,435
  Program node flushes: 0
  CompilationUnit node flushes: 55,579
   of which caused by
   * inserting default constructors: 279
   * inserting default super constructor invocation: 1636
   * on-demand-loading a type: 1225
   * on-demand-loading a field: 7006
   * on-demand-loading a method: 15730
  maximum heap size about 1.5G
  
  repeating error-check right away takes about one minute

omitting dependencies on library:
  23m28.27s
  23m55.34s
   0m 3.19s

suppressing flushes:
   8m23s
   8m43s
   0m 3s

with timestamps:
  13m44.54s
  13m32.71s
   0m 3.60s

  only about 30,000 flushes
  maximum heap size about 1.7G

with timestamps, suppressing flushes:
   1m56.27s
   2m 5.80s
   0m 3.34s

  repeating error-check right away takes about eight to nine seconds

with timestamps, non-invalidating constructors in NTAs:
   3m 5.79s
   3m18.87s
   0m 2.60s

with timestamps, no cheating:
   1m52.62s
   2m 1.60s
   0m 2.77s