4,536,511,400 bytes allocated in the heap 2,318,559,160 bytes copied during GC (scavenged) 69,225,392 bytes copied during GC (not scavenged) 8,597,504 bytes maximum residency (213 sample(s)) 8436 collections in generation 0 ( 9.07s) 213 collections in generation 1 ( 1.98s) 19 Mb total memory in use Task 0 (worker) : MUT time: 0.00s ( 0.00s elapsed) GC time: 0.00s ( 0.00s elapsed) Task 1 (worker) : MUT time: 2.78s ( 35.21s elapsed) GC time: 0.03s ( 0.05s elapsed) Task 2 (worker) : MUT time: 31.59s ( 35.21s elapsed) GC time: 11.02s ( 11.52s elapsed) Task 3 (worker) : MUT time: 0.00s ( 35.21s elapsed) GC time: 0.00s ( 0.00s elapsed) Task 4 (worker) : MUT time: 0.12s ( 35.21s elapsed) GC time: 0.00s ( 0.00s elapsed) INIT time 0.00s ( 0.00s elapsed) MUT time 14.91s ( 35.21s elapsed) GC time 11.05s ( 11.57s elapsed) EXIT time 0.00s ( 0.00s elapsed) Total time 25.96s ( 46.79s elapsed) %GC time 42.6% (24.7% elapsed) Alloc rate 304,259,651 bytes per MUT second Productivity 57.4% of total user, 31.9% of total elapsed ./nuke +RTS -N1 -sstderr -RTS 25.96s user 19.73s system 97% cpu 46.790 total