#8611: nofib’s cacheprof’s allocations nondeterminisitic -------------------------------------+------------------------------------- Reporter: nomeata | Owner: (none) Type: bug | Status: new Priority: normal | Milestone: Component: NoFib benchmark | Version: 8.5 suite | Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: None/Unknown | Test Case: Blocked By: | Blocking: Related Tickets: #4450 | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Changes (by sgraf): * cc: simonmar (added) Comment: Indeed, never making the call to `ThreadPaused.c:stackSqueeze()` gets rid of the non-determinism. So does `+RTS -V0` (which disables the master tick timer that triggers context switches, if understand correctly) as proposed in #4450 and `+RTS -Z` (which just deactivates stack squeezing completely). The latter seems like an easy fix for this particular benchmark, but this will probably come up again in the future. Maybe we can teach the RTS not do stack squeezing during context switches? CCing simonmar for input, as I'm not particularly familiar with RTS internals. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/8611#comment:11 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler