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ruby/benchmark/vm_send_cfunc.yml

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Optimize cfunc calls for f(*a) and f(*a, **kw) if kw is empty This optimizes the following calls: * ~10-15% for f(*a) when a does not end with a flagged keywords hash * ~10-15% for f(*a) when a ends with an empty flagged keywords hash * ~35-40% for f(*a, **kw) if kw is empty This still copies the array contents to the VM stack, but avoids some overhead. It would be faster to use the array pointer directly, but that could cause problems if the array was modified during the call to the function. You could do that optimization for frozen arrays, but as splatting frozen arrays is uncommon, and the speedup is minimal (<5%), it doesn't seem worth it. The vm_send_cfunc benchmark has been updated to test additional cfunc call types, and the numbers above were taken from the benchmark results.
2023-04-01 19:19:35 +03:00
prelude: |
ary = []
kw = {a: 1}
empty_kw = {}
kw_ary = [Hash.ruby2_keywords_hash(a: 1)]
empty_kw_ary = [Hash.ruby2_keywords_hash({})]
Make vm_call_cfunc_with_frame a fastpath (#3027) when there's no need to call CALLER_SETUP_ARG and CALLER_REMOVE_EMPTY_KW_SPLAT (i.e. !rb_splat_or_kwargs_p(ci) && !calling->kw_splat). Micro benchmark: ``` $ benchmark-driver -v --rbenv 'before;after' benchmark/vm_send_cfunc.yml --repeat-count=4 before: ruby 2.8.0dev (2020-04-13T23:45:05Z master b9d3ceee8f) [x86_64-linux] after: ruby 2.8.0dev (2020-04-14T00:48:52Z no-splat-fastpath 418d363722) [x86_64-linux] Calculating ------------------------------------- before after vm_send_cfunc 69.585M 88.724M i/s - 100.000M times in 1.437097s 1.127096s Comparison: vm_send_cfunc after: 88723605.2 i/s before: 69584737.1 i/s - 1.28x slower ``` Optcarrot: ``` $ benchmark-driver -v --rbenv 'before;after' benchmark.yml --repeat-count=12 --output=all before: ruby 2.8.0dev (2020-04-13T23:45:05Z master b9d3ceee8f) [x86_64-linux] after: ruby 2.8.0dev (2020-04-14T00:48:52Z no-splat-fastpath 418d363722) [x86_64-linux] Calculating ------------------------------------- before after Optcarrot Lan_Master.nes 50.76119601545175 42.73858236484051 fps 50.76388649761503 51.04211379912850 50.80930672252514 51.39455790755538 50.90236000778749 51.75656936556145 51.01744746340430 51.86875277356489 51.06495279015112 51.88692482485558 51.07785337168974 51.93429603190578 51.20163525187862 51.95768145071314 51.34671771913112 52.45577266040274 51.35918340835583 52.53163888762858 51.46641337418146 52.62172484121034 51.50835463462257 52.85064021113239 ```
2020-04-14 06:32:59 +03:00
benchmark:
Optimize cfunc calls for f(*a) and f(*a, **kw) if kw is empty This optimizes the following calls: * ~10-15% for f(*a) when a does not end with a flagged keywords hash * ~10-15% for f(*a) when a ends with an empty flagged keywords hash * ~35-40% for f(*a, **kw) if kw is empty This still copies the array contents to the VM stack, but avoids some overhead. It would be faster to use the array pointer directly, but that could cause problems if the array was modified during the call to the function. You could do that optimization for frozen arrays, but as splatting frozen arrays is uncommon, and the speedup is minimal (<5%), it doesn't seem worth it. The vm_send_cfunc benchmark has been updated to test additional cfunc call types, and the numbers above were taken from the benchmark results.
2023-04-01 19:19:35 +03:00
vm_send_cfunc: itself
vm_send_cfunc_splat: itself(*ary)
vm_send_cfunc_splat_kw_hash: equal?(*kw_ary)
vm_send_cfunc_splat_empty_kw_hash: itself(*empty_kw_ary)
vm_send_cfunc_splat_kw: equal?(*ary, **kw)
vm_send_cfunc_splat_empty_kw: itself(*ary, **empty_kw)
loop_count: 20000000