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In a 2005 research paper it said
Concurrent Haskell is currently implemented only for a uni-processor. The runtime schedules lightweight Haskell thread within a single operating system thread. Haskell threads are only suspended at well-defined “safe points”; they cannot be pre-empted at arbitrary moments.
Has this changed or is Concurrent Haskell still restricted to a single OS thread?
GHC can use multi-cores for Concurrent and Parallel Haskell since 2004. Concurrent, Parallel, Nested Data Parallel Haskell all use the same multi-threaded runtime.