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80c50308f9
This patch will add pre-allocation in string interpolation.
By this, unecessary capacity resizing is avoided.
For small strings, optimized `rb_str_resurrect` operation is
faster, so pre-allocation is done only when concatenated strings
are large. `MIN_PRE_ALLOC_SIZE` was decided by experimenting with
local machine (x86_64-apple-darwin 16.5.0, Apple LLVM version
8.1.0 (clang - 802.0.42)).
String interpolation will be faster around 72% when large string is created.
* Before
```
Calculating -------------------------------------
Large string interpolation
1.276M (± 5.9%) i/s - 6.358M in 5.002022s
Small string interpolation
5.156M (± 5.5%) i/s - 25.728M in 5.005731s
```
* After
```
Calculating -------------------------------------
Large string interpolation
2.201M (± 5.8%) i/s - 11.063M in 5.043724s
Small string interpolation
5.192M (± 5.7%) i/s - 25.971M in 5.020516s
```
* Test code
```ruby
require 'benchmark/ips'
Benchmark.ips do |x|
x.report "Large string interpolation" do |t|
a = "Hellooooooooooooooooooooooooooooooooooooooooooooooooooo"
b = "Wooooooooooooooooooooooooooooooooooooooooooooooooooorld"
t.times do
"#{a}, #{b}!"
end
end
x.report "Small string interpolation" do |t|
a = "Hello"
b = "World"
t.times do
"#{a}, #{b}!"
end
end
end
```
[Fix GH-1626]
From: Nao Minami <south37777@gmail.com>
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@60320 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
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| .. | ||
| enc | ||
| allpairs.rb | ||
| beginmainend.rb | ||
| bug-11928.rb | ||
| bug-13526.rb | ||
| lbtest.rb | ||
| marshaltestlib.rb | ||
| sentence.rb | ||
| test_alias.rb | ||
| test_argf.rb | ||
| test_arity.rb | ||
| test_array.rb | ||
| test_assignment.rb | ||
| test_autoload.rb | ||
| test_backtrace.rb | ||
| test_basicinstructions.rb | ||
| test_beginendblock.rb | ||
| test_bignum.rb | ||
| test_call.rb | ||
| test_case.rb | ||
| test_class.rb | ||
| test_clone.rb | ||
| test_comparable.rb | ||
| test_complex.rb | ||
| test_complex2.rb | ||
| test_complexrational.rb | ||
| test_condition.rb | ||
| test_const.rb | ||
| test_continuation.rb | ||
| test_defined.rb | ||
| test_dir.rb | ||
| test_dir_m17n.rb | ||
| test_econv.rb | ||
| test_encoding.rb | ||
| test_enum.rb | ||
| test_enumerator.rb | ||
| test_env.rb | ||
| test_eval.rb | ||
| test_exception.rb | ||
| test_fiber.rb | ||
| test_file.rb | ||
| test_file_exhaustive.rb | ||
| test_fixnum.rb | ||
| test_flip.rb | ||
| test_float.rb | ||
| test_fnmatch.rb | ||
| test_gc.rb | ||
| test_hash.rb | ||
| test_ifunless.rb | ||
| test_integer.rb | ||
| test_integer_comb.rb | ||
| test_io.rb | ||
| test_io_m17n.rb | ||
| test_iseq.rb | ||
| test_iterator.rb | ||
| test_keyword.rb | ||
| test_lambda.rb | ||
| test_lazy_enumerator.rb | ||
| test_literal.rb | ||
| test_m17n.rb | ||
| test_m17n_comb.rb | ||
| test_marshal.rb | ||
| test_math.rb | ||
| test_metaclass.rb | ||
| test_method.rb | ||
| test_mixed_unicode_escapes.rb | ||
| test_module.rb | ||
| test_not.rb | ||
| test_notimp.rb | ||
| test_numeric.rb | ||
| test_object.rb | ||
| test_objectspace.rb | ||
| test_optimization.rb | ||
| test_pack.rb | ||
| test_parse.rb | ||
| test_path.rb | ||
| test_pipe.rb | ||
| test_primitive.rb | ||
| test_proc.rb | ||
| test_process.rb | ||
| test_rand.rb | ||
| test_range.rb | ||
| test_rational.rb | ||
| test_rational2.rb | ||
| test_readpartial.rb | ||
| test_refinement.rb | ||
| test_regexp.rb | ||
| test_require.rb | ||
| test_rubyoptions.rb | ||
| test_rubyvm.rb | ||
| test_settracefunc.rb | ||
| test_signal.rb | ||
| test_sleep.rb | ||
| test_sprintf.rb | ||
| test_sprintf_comb.rb | ||
| test_string.rb | ||
| test_stringchar.rb | ||
| test_struct.rb | ||
| test_super.rb | ||
| test_symbol.rb | ||
| test_syntax.rb | ||
| test_system.rb | ||
| test_thread.rb | ||
| test_threadgroup.rb | ||
| test_time.rb | ||
| test_time_tz.rb | ||
| test_trace.rb | ||
| test_transcode.rb | ||
| test_undef.rb | ||
| test_unicode_escape.rb | ||
| test_variable.rb | ||
| test_vm_dump.rb | ||
| test_weakmap.rb | ||
| test_whileuntil.rb | ||
| test_yield.rb | ||
| ut_eof.rb | ||