eileencodes 34a2acdac7 Add a cache for class variables ... This change implements a cache for class variables. Previously there was no cache for cvars. Cvar access is slow due to needing to travel all the way up th ancestor tree before returning the cvar value. The deeper the ancestor tree the slower cvar access will be. The benefits of the cache are more visible with a higher number of included modules due to the way Ruby looks up class variables. The benchmark here includes 26 modules and shows with the cache, this branch is 6.5x faster when accessing class variables. ``` compare-ruby: ruby 3.1.0dev (2021-03-15T06:22:34Z master 9e5105ca45) [x86_64-darwin19] built-ruby: ruby 3.1.0dev (2021-03-15T12:12:44Z add-cache-for-clas.. c6be0093ae) [x86_64-darwin19] | |compare-ruby|built-ruby| |:--------|-----------:|---------:| |vm_cvar | 5.681M| 36.980M| | | -| 6.51x| ``` Benchmark.ips calling `ActiveRecord::Base.logger` from within a Rails application. ActiveRecord::Base.logger has 71 ancestors. The more ancestors a tree has, the more clear the speed increase. IE if Base had only one ancestor we'd see no improvement. This benchmark is run on a vanilla Rails application. Benchmark code: ```ruby require "benchmark/ips" require_relative "config/environment" Benchmark.ips do |x| x.report "logger" do ActiveRecord::Base.logger end end ``` Ruby 3.0 master / Rails 6.1: ``` Warming up -------------------------------------- logger 155.251k i/100ms Calculating ------------------------------------- ``` Ruby 3.0 with cvar cache / Rails 6.1: ``` Warming up -------------------------------------- logger 1.546M i/100ms Calculating ------------------------------------- logger 14.857M (± 4.8%) i/s - 74.198M in 5.006202s ``` Lastly we ran a benchmark to demonstate the difference between master and our cache when the number of modules increases. This benchmark measures 1 ancestor, 30 ancestors, and 100 ancestors. Ruby 3.0 master: ``` Warming up -------------------------------------- 1 module 1.231M i/100ms 30 modules 432.020k i/100ms 100 modules 145.399k i/100ms Calculating ------------------------------------- 1 module 12.210M (± 2.1%) i/s - 61.553M in 5.043400s 30 modules 4.354M (± 2.7%) i/s - 22.033M in 5.063839s 100 modules 1.434M (± 2.9%) i/s - 7.270M in 5.072531s Comparison: 1 module: 12209958.3 i/s 30 modules: 4354217.8 i/s - 2.80x (± 0.00) slower 100 modules: 1434447.3 i/s - 8.51x (± 0.00) slower ``` Ruby 3.0 with cvar cache: ``` Warming up -------------------------------------- 1 module 1.641M i/100ms 30 modules 1.655M i/100ms 100 modules 1.620M i/100ms Calculating ------------------------------------- 1 module 16.279M (± 3.8%) i/s - 82.038M in 5.046923s 30 modules 15.891M (± 3.9%) i/s - 79.459M in 5.007958s 100 modules 16.087M (± 3.6%) i/s - 81.005M in 5.041931s Comparison: 1 module: 16279458.0 i/s 100 modules: 16087484.6 i/s - same-ish: difference falls within error 30 modules: 15891406.2 i/s - same-ish: difference falls within error ``` Co-authored-by: Aaron Patterson <tenderlove@ruby-lang.org>		2021-05-11 13:27:06 -04:00
..
array.h	Define rb_to_array which converts with to_a	2021-02-12 12:15:57 +09:00
bignum.h	Add RBIMPL_RVALUE_EMBED_LEN_MAX neeeded by internal/bignum.h	2021-05-04 14:56:55 +02:00
bits.h	get rid of using __builtin_unreachable directly [Bug #17787]	2021-04-10 16:05:01 +09:00
class.h	Add a cache for class variables	2021-05-11 13:27:06 -04:00
compar.h
compile.h
compilers.h
complex.h
cont.h	Expose scheduler as public interface & bug fixes. (#3945)	2021-02-09 19:39:56 +13:00
dir.h
enc.h
encoding.h	rb_enc_interned_str: handle autoloaded encodings	2021-03-22 21:37:48 +09:00
enum.h
enumerator.h
error.h
eval.h
file.h
fixnum.h
gc.h	Protoized old pre-ANSI K&R style declarations and definitions	2021-05-07 00:04:36 +09:00
hash.h
imemo.h	Partially revert 2c7d3b3a72	2021-04-27 17:05:19 +09:00
inits.h
io.h
load.h
loadpath.h
math.h
missing.h
numeric.h
object.h	RBASIC_SET_CLASS_RAW: follow strict aliasing rule	2021-03-02 17:47:28 +09:00
parse.h
proc.h
process.h
random.h
range.h
rational.h
re.h
sanitizers.h
serial.h
signal.h
static_assert.h
string.h
struct.h
symbol.h
thread.h
time.h
transcode.h
util.h
variable.h
vm.h	Revert "[Bug #11213] let defined?(super) call respond_to_missing?"	2021-01-13 18:11:46 +09:00
warnings.h	Fix some typos by spell checker	2021-04-26 10:07:41 +09:00