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13 days[ruby/mmtk] Process obj_free candidates in parallelPeter Zhu
Redos commit 544770d which seems to have accidentally been undone in b27d935.
14 days[ruby/mmtk] Propagate crash of GC thread to mutator threadPeter Zhu
This allows the mutator thread to dump its backtrace when a GC thread crashes. https://github.com/ruby/mmtk/commit/40ff9ffee7
2025-12-31Use `is_obj_encoding` instead of `is_data_encoding`Nobuyoshi Nakada
The argument to `is_data_encoding` is assumed to be `T_DATA`.
2025-12-31[ruby/mmtk] Process obj_free candidates in parallelPeter Zhu
This commit allows objects that are safe to be freed in parallel to do so. A decrease in object freeing time can be seen in profiles. The benchmarks don't show much difference. Before: -------------- -------------------- ---------- --------- bench sequential free (ms) stddev (%) RSS (MiB) activerecord 242.3 7.4 84.3 chunky-png 439.1 0.6 75.6 erubi-rails 1221.2 4.2 132.7 hexapdf 1544.8 1.8 429.1 liquid-c 42.7 7.4 48.5 liquid-compile 41.4 8.3 52.2 liquid-render 100.6 3.0 56.8 mail 108.9 2.1 65.1 psych-load 1536.9 0.6 43.4 railsbench 1633.5 2.6 146.2 rubocop 126.5 15.8 142.1 ruby-lsp 129.6 9.7 112.2 sequel 47.9 6.5 44.6 shipit 1152.0 2.7 315.2 -------------- -------------------- ---------- --------- After: -------------- ------------------ ---------- --------- bench parallel free (ms) stddev (%) RSS (MiB) activerecord 235.1 5.5 87.4 chunky-png 440.8 0.8 68.1 erubi-rails 1105.3 0.8 128.0 hexapdf 1578.3 4.1 405.1 liquid-c 42.6 7.1 48.4 liquid-compile 41.5 8.1 52.1 liquid-render 101.2 2.8 53.3 mail 109.7 2.7 64.8 psych-load 1567.7 1.1 44.4 railsbench 1644.9 1.9 150.9 rubocop 125.6 15.4 148.5 ruby-lsp 127.9 5.8 104.6 sequel 48.2 6.1 44.1 shipit 1215.3 4.7 320.5 -------------- ------------------ ---------- --------- https://github.com/ruby/mmtk/commit/4f0b5fd2eb
2025-12-29Implement moving Immix in MMTkPeter Zhu
This commit implements moving Immix in MMTk, which allows objects to move in the GC. The performance of this implementation is not yet amazing. It is very similar to non-moving Immix in many of them and slightly slower in others. The benchmark results is shown below. -------------- ----------------- ---------- --------- bench Moving Immix (ms) stddev (%) RSS (MiB) activerecord 241.9 0.5 86.6 chunky-png 447.8 0.8 74.9 erubi-rails 1183.9 0.8 136.1 hexapdf 1607.9 2.6 402.3 liquid-c 45.4 6.7 44.9 liquid-compile 44.1 9.3 53.0 liquid-render 105.4 4.5 55.9 lobsters 650.1 9.7 418.4 mail 115.4 2.1 64.4 psych-load 1656.8 0.8 43.6 railsbench 1653.5 1.3 149.8 rubocop 127.0 15.6 142.1 ruby-lsp 130.7 10.5 99.4 sequel 52.8 7.2 45.6 shipit 1187.0 3.9 311.0 -------------- ----------------- ---------- --------- -------------- --------------------- ---------- --------- bench Non-moving Immix (ms) stddev (%) RSS (MiB) activerecord 218.9 2.7 86.1 chunky-png 464.6 0.8 66.7 erubi-rails 1119.0 4.3 132.7 hexapdf 1539.8 1.8 425.2 liquid-c 40.6 6.9 45.2 liquid-compile 40.6 8.1 52.9 liquid-render 99.3 2.3 48.3 mail 107.4 5.3 65.4 psych-load 1535.6 1.0 39.5 railsbench 1565.6 1.1 149.6 rubocop 122.5 14.3 146.7 ruby-lsp 128.4 10.7 106.4 sequel 44.1 4.0 45.7 shipit 1154.5 2.7 358.5 -------------- --------------------- ---------- ---------
2025-12-25Implement declarative weak references in MMTkPeter Zhu
2025-12-20[ruby/mmtk] Implement fast path for bump pointer allocatorPeter Zhu
Adding a fast path for bump pointer allocator can improve allocation performance. For the following microbenchmark with MMTK_HEAP_MIN=100MiB: 10_000_000.times { String.new } Before: 810.7 ms ± 8.3 ms [User: 790.9 ms, System: 40.3 ms] After: 777.9 ms ± 10.4 ms [User: 759.0 ms, System: 37.9 ms] https://github.com/ruby/mmtk/commit/0ff5c9f579
2025-12-20[ruby/mmtk] Call rb_bug when Ruby mutator thread panicsPeter Zhu
This will allow the Ruby backtrace, memory mapping, etc. to be outputted when a Ruby mutator thread panics. https://github.com/ruby/mmtk/commit/d10fd325dd
2025-07-30[ruby/mmtk] Skip weak references that are special constsPeter Zhu
If a reference marked weak becomes a special const, it will crash because it is not a GC handled object. We should skip special consts here. https://github.com/ruby/mmtk/commit/870a79426b
2025-05-08Move `object_id` in object fields.Jean Boussier
And get rid of the `obj_to_id_tbl` It's no longer needed, the `object_id` is now stored inline in the object alongside instance variables. We still need the inverse table in case `_id2ref` is invoked, but we lazily build it by walking the heap if that happens. The `object_id` concern is also no longer a GC implementation concern, but a generic implementation. Co-Authored-By: Matt Valentine-House <matt@eightbitraptor.com> Notes: Merged: https://github.com/ruby/ruby/pull/13159
2025-04-08[ruby/mmtk] Do root scanning in scan_vm_specific_rootsKunshan Wang
We rely on scan_vm_specific_roots to reach all stacks via the following path: VM -> ractors -> threads -> fibers -> stacks https://github.com/ruby/mmtk/commit/0a6a835aaa
2025-02-24[ruby/mmtk] Trigger forced GC in GC.startKunshan Wang
We now use `MMTK::handle_user_collection_request(true, ...)` to force triggering a GC instead of enabling GC temporarily. https://github.com/ruby/mmtk/commit/02ef47f818
2025-01-17[ruby/mmtk] Add mmtk_heap_max to GC.configPeter Zhu
https://github.com/ruby/mmtk/commit/6a78ffaf16
2025-01-16[ruby/mmtk] Add mmtk_heap_min to GC.configPeter Zhu
https://github.com/ruby/mmtk/commit/5bbac70c69
2025-01-16[ruby/mmtk] Add mmtk_heap_mode to GC.configPeter Zhu
https://github.com/ruby/mmtk/commit/810f897603
2025-01-15[ruby/mmtk] Add mmtk_plan to GC.configPeter Zhu
https://github.com/ruby/mmtk/commit/67da9ea5b8
2025-01-15[ruby/mmtk] Fix mmtk.hPeter Zhu
https://github.com/ruby/mmtk/commit/dbb4036be9
2025-01-14[ruby/mmtk] Add mmtk_worker_count to GC.configPeter Zhu
https://github.com/ruby/mmtk/commit/836a9059cb
2024-11-22[ruby/mmtk] Use extconf.rb for external GC compilationPeter Zhu
This commit adds extconf.rb for both the default GC and and MMTk to build the external GC. This allows common.mk to not need to contain any implementation-specific build configuration. https://github.com/ruby/mmtk/commit/db6a29b4a9
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