#9570: cryptarithm1 (normal) has bimodal runtime -------------------------------------+------------------------------------- Reporter: ezyang | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: NoFib benchmark | Version: 7.9 suite | Operating System: Keywords: | Unknown/Multiple Architecture: Unknown/Multiple | Type of failure: Difficulty: Unknown | None/Unknown Blocked By: | Test Case: Related Tickets: | Blocking: | Differential Revisions: -------------------------------------+------------------------------------- I was investigating performance numbers for cryptarithm1 in #8199, I noticed that the numbers for this benchmark were curiously bimodal. Here are two representative samples from both sides of the distribution. {{{ ../../runstdtest/runstdtest ./cryptarithm1 -o1 cryptarithm1.stdout -o1 cryptarithm1.stdout -ghc-timing ; ../../runstdtest/runstdtest ./cryptarithm1 -o1 cryptarithm1.stdout -o1 cryptarithm1.stdout -ghc- timing ; ../../runstdtest/runstdtest ./cryptarithm1 -o1 cryptarithm1.stdout -o1 cryptarithm1.stdout -ghc-timing ; ../../runstdtest/runstdtest ./cryptarithm1 -o1 cryptarithm1.stdout -o1 cryptarithm1.stdout -ghc-timing ; ../../runstdtest/runstdtest ./cryptarithm1 -o1 cryptarithm1.stdout -o1 cryptarithm1.stdout -ghc- timing ; real 0m0.676s user 0m0.660s sys 0m0.013s <<ghc: 2051819320 bytes, 3929 GCs (3927 + 2), 0/0 avg/max bytes residency (0 samples), 5221368 bytes GC work, 1M in use, 0.000 INIT (0.000 elapsed), 0.643 MUT (0.643 elapsed), 0.026 GC (0.026 elapsed), 0.026 GC(0) (0.025 elapsed), 0.000 GC(1) (0.000 elapsed), 1 balance :ghc>> real 0m0.610s user 0m0.603s sys 0m0.007s <<ghc: 2051819320 bytes, 3929 GCs (3927 + 2), 0/0 avg/max bytes residency (0 samples), 5221368 bytes GC work, 1M in use, 0.000 INIT (0.000 elapsed), 0.582 MUT (0.582 elapsed), 0.023 GC (0.023 elapsed), 0.023 GC(0) (0.023 elapsed), 0.000 GC(1) (0.000 elapsed), 1 balance :ghc>> }}} I don't have any further resolution on the problem yet. -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9570> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler