diff options
| author | Jean Boussier <[email protected]> | 2024-10-29 10:23:25 +0100 |
|---|---|---|
| committer | Hiroshi SHIBATA <[email protected]> | 2024-10-30 10:13:48 +0900 |
| commit | 5d176436ce4683df57decab6e686c319bc4c53cd (patch) | |
| tree | 587f7945dc945b5a29ee92b9b92e820b43f61814 /ext/json/generator/generator.h | |
| parent | 926b4e2f4052df7cbf4ef0c24c26e0e44cb5bb2b (diff) | |
[ruby/json] Allocate the FBuffer struct on the stack
Ref: https://github.com/ruby/json/issues/655
The actual buffer is still on the heap, but this saves a pair
of malloc/free.
This helps a lot on micro-benchmarks
Before:
```
ruby 3.3.4 (2024-07-09 revision https://github.com/ruby/json/commit/be1089c8ec) +YJIT [arm64-darwin23]
Warming up --------------------------------------
Oj 531.598k i/100ms
JSON reuse 417.666k i/100ms
Calculating -------------------------------------
Oj 5.735M (± 1.3%) i/s (174.35 ns/i) - 28.706M in 5.005900s
JSON reuse 4.604M (± 1.4%) i/s (217.18 ns/i) - 23.389M in 5.080779s
Comparison:
Oj: 5735475.6 i/s
JSON reuse: 4604380.3 i/s - 1.25x slower
```
After:
```
ruby 3.3.4 (2024-07-09 revision https://github.com/ruby/json/commit/be1089c8ec) +YJIT [arm64-darwin23]
Warming up --------------------------------------
Oj 518.700k i/100ms
JSON reuse 483.370k i/100ms
Calculating -------------------------------------
Oj 5.722M (± 1.8%) i/s (174.76 ns/i) - 29.047M in 5.077823s
JSON reuse 5.278M (± 1.5%) i/s (189.46 ns/i) - 26.585M in 5.038172s
Comparison:
Oj: 5722283.8 i/s
JSON reuse: 5278061.7 i/s - 1.08x slower
```
Bench:
```ruby
require 'benchmark/ips'
require 'oj'
require 'json'
json_encoder = JSON::State.new(JSON.dump_default_options)
test_data = [1, "string", { a: 1, b: 2 }, [3, 4, 5]]
Oj.default_options = Oj.default_options.merge(mode: :compat)
Benchmark.ips do |x|
x.config(time: 5, warmup: 2)
x.report("Oj") do
Oj.dump(test_data)
end
x.report("JSON reuse") do
json_encoder.generate(test_data)
end
x.compare!(order: :baseline)
end
```
https://github.com/ruby/json/commit/72110f7992
Diffstat (limited to 'ext/json/generator/generator.h')
| -rw-r--r-- | ext/json/generator/generator.h | 9 |
1 files changed, 4 insertions, 5 deletions
diff --git a/ext/json/generator/generator.h b/ext/json/generator/generator.h index 3710ce7c22..230c08a64d 100644 --- a/ext/json/generator/generator.h +++ b/ext/json/generator/generator.h @@ -55,16 +55,16 @@ typedef struct JSON_Generator_StateStruct { GET_STATE_TO(self, state) #define GENERATE_JSON(type) \ - FBuffer *buffer; \ VALUE Vstate; \ JSON_Generator_State *state; \ \ rb_scan_args(argc, argv, "01", &Vstate); \ Vstate = cState_from_state_s(cState, Vstate); \ TypedData_Get_Struct(Vstate, JSON_Generator_State, &JSON_Generator_State_type, state); \ - buffer = cState_prepare_buffer(Vstate); \ - generate_json_##type(buffer, Vstate, state, self); \ - return fbuffer_to_s(buffer) + FBuffer buffer = {0}; \ + fbuffer_init(&buffer, state->buffer_initial_length); \ + generate_json_##type(&buffer, Vstate, state, self); \ + return fbuffer_to_s(&buffer) static VALUE mHash_to_json(int argc, VALUE *argv, VALUE self); static VALUE mArray_to_json(int argc, VALUE *argv, VALUE self); @@ -122,7 +122,6 @@ static VALUE cState_script_safe(VALUE self); static VALUE cState_script_safe_set(VALUE self, VALUE depth); static VALUE cState_strict(VALUE self); static VALUE cState_strict_set(VALUE self, VALUE strict); -static FBuffer *cState_prepare_buffer(VALUE self); static const rb_data_type_t JSON_Generator_State_type; |