[Haskell-cafe] GC times with +RTS -N2 -s

[Erik Rantapaa]

When I run the sudoko2 program from the parconc-examples package, I get
output like:

...
  SPARKS: 2 (1 converted, 0 overflowed, 0 dud, 0 GC'd, 1 fizzled)

  INIT    time    0.00s  (  0.02s elapsed)
  MUT     time    1.75s  (  1.44s elapsed)
  GC      time    0.73s  (  0.14s elapsed)
  EXIT    time    0.00s  (  0.00s elapsed)
  Total   time    2.48s  (  1.60s elapsed)
...

My full command line is: ./sudoku2 sudoku17.1000.txt +RTS -N2 -s

I understand how to interpret the Total time - 2.48 seconds is the total
time spent by both cores and 1.6 seconds is the running time of the program
as a whole. But how should interpret the GC times? What do 0.73s and 0.14s
actually represent?

This is with GHC 7.8.3, OSX 10.8.5, 64-bit Haskell Platform.
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