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Currently runtime keeps hold to 4*used_memory. This includes, in particular, nursery, which can be quite large on multiprocessor machines: 16 CPUs x 64Mb each is 1GB. Multiplying it by 4 means whatever actual memory usage is, runtime will never release memory under 4GB, and this is quite excessive for processes which only need a lot of memory shortly (think building data structures from large files). This diff makes multiplier to apply only to GC-managed memory, leaving all "static" allocations alone. Test Plan: make test TEST="T14702" Reviewers: bgamari, erikd, simonmar Reviewed By: simonmar Subscribers: rwbarton, thomie, carter GHC Trac Issues: #14702 Differential Revision: https://phabricator.haskell.org/D4338
Currently runtime keeps hold to 4*used_memory. This includes, in particular, nursery, which can be quite large on multiprocessor machines: 16 CPUs x 64Mb each is 1GB. Multiplying it by 4 means whatever actual memory usage is, runtime will never release memory under 4GB, and this is quite excessive for processes which only need a lot of memory shortly (think building data structures from large files). This diff makes multiplier to apply only to GC-managed memory, leaving all "static" allocations alone. Test Plan: make test TEST="T14702" Reviewers: bgamari, erikd, simonmar Reviewed By: simonmar Subscribers: rwbarton, thomie, carter GHC Trac Issues: #14702 Differential Revision: https://phabricator.haskell.org/D4338
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