Use a freelist for struct types - #44
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This adds a freelist for "small" struct objects (currently defined as `1 <= nfields <= 10`). Structs are added to the freelist during deallocation, up to a per-size cap (currently 2000). Structs can then be allocated from the freelist (if non-empty), skipping the cost of a malloc. To prevent keeping old pages around, the freelist is cleared every major GC collection. This is done by a hook added to the module `m_traverse` (since modules should persist for the lifetime of the program, they'll usually be in the largest generation). During high load, this leads to a measurable (4-6%) performance improvement on deserialization.
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Running the benchmark script gives: master This PR For 10% and 4% speedups on load time respectively. |
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This adds a freelist for "small" struct objects (currently defined as
1 <= nfields <= 10). Structs are added to the freelist duringdeallocation, up to a per-size cap (currently 2000). Structs can then be
allocated from the freelist (if non-empty), skipping the cost of a
malloc.
To prevent keeping old pages around, the freelist is cleared every major
GC collection. This is done by a hook added to the module
m_traverse(since modules should persist for the lifetime of the program, they'll
usually be in the largest generation).
During high load, this leads to a measurable (4-6%) performance
improvement on deserialization.