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ruby--ruby/benchmark
eileencodes b91b3bc771 Add a cache for class variables
Redo of 34a2acdac7 and
931138b006 which were reverted.

GitHub PR #4340.

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 9e5105c) [x86_64-darwin19]
built-ruby: ruby 3.1.0dev (2021-03-15T12:12:44Z add-cache-for-clas.. c6be009) [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>
2021-06-18 10:02:44 -07:00
..
gc
lib
other-lang
app_answer.rb
app_aobench.rb
app_erb.yml
app_factorial.rb
app_fib.rb
app_lc_fizzbuzz.rb
app_mandelbrot.rb
app_pentomino.rb
app_raise.rb
app_strconcat.rb
app_tak.rb
app_tarai.rb
app_uri.rb
array_flatten.yml
array_intersection.yml
array_max_float.yml
array_max_int.yml
array_max_str.yml
array_min.yml
array_sample_100k_10.rb
array_sample_100k_11.rb
array_sample_100k__1k.rb
array_sample_100k__6k.rb
array_sample_100k__100.rb
array_sample_100k___10k.rb
array_sample_100k___50k.rb
array_shift.rb
array_small_and.rb
array_small_diff.rb
array_small_or.rb
array_sort_block.rb
array_sort_float.rb
array_values_at_int.rb
array_values_at_range.rb
bighash.rb
cgi_escape_html.yml
complex_float_add.yml
complex_float_div.yml
complex_float_mul.yml
complex_float_new.yml
complex_float_power.yml
complex_float_sub.yml
dir_empty_p.rb
enum_lazy_flat_map.yml
enum_lazy_grep_v_20.rb
enum_lazy_grep_v_50.rb
enum_lazy_grep_v_100.rb
enum_lazy_uniq_20.rb
enum_lazy_uniq_50.rb
enum_lazy_uniq_100.rb
enum_lazy_zip.yml
enum_tally.yml
erb_render.yml
fiber_chain.yml
fiber_locals.yml
file_chmod.rb
file_rename.rb
float_methods.yml
float_neg_posi.yml
float_to_s.yml
hash_aref_dsym.rb
hash_aref_dsym_long.rb
hash_aref_fix.rb
hash_aref_flo.rb
hash_aref_miss.rb
hash_aref_str.rb
hash_aref_sym.rb
hash_aref_sym_long.rb
hash_defaults.yml
hash_dup.yml
hash_first.yml
hash_flatten.rb
hash_ident_flo.rb
hash_ident_num.rb
hash_ident_obj.rb
hash_ident_str.rb
hash_ident_sym.rb
hash_keys.rb
hash_literal_small2.rb
hash_literal_small4.rb
hash_literal_small8.rb
hash_long.rb
hash_shift.rb
hash_shift_u16.rb
hash_shift_u24.rb
hash_shift_u32.rb
hash_small2.rb
hash_small4.rb
hash_small8.rb
hash_to_proc.rb
hash_values.rb
int_quo.rb
io_copy_stream_write.rb
io_copy_stream_write_socket.rb
io_file_create.rb
io_file_read.rb
io_file_write.rb
io_nonblock_noex.rb
io_nonblock_noex2.rb
io_pipe_rw.rb
io_select.rb
io_select2.rb
io_select3.rb
irb_color.yml
irb_exec.yml
iseq_load_from_binary.yml
ivar_extend.yml
kernel_clone.yml
kernel_float.yml
kernel_tap.yml
kernel_then.yml
keyword_arguments.yml
loop_for.rb
loop_generator.rb
loop_times.rb
loop_whileloop.rb
loop_whileloop2.rb
marshal_dump_flo.rb
marshal_dump_load_geniv.rb
marshal_dump_load_time.rb
masgn.yml
match_gt4.rb
match_small.rb
method_bind_call.yml
mjit_exec_jt2jt.yml
mjit_exec_vm2jt.yml
mjit_exec_vm2vm.yml
mjit_exivar.yml
mjit_integer.yml
mjit_kernel.yml
mjit_leave.yml
mjit_opt_cc_insns.yml
mjit_struct_aref.yml
nil_p.yml
nilclass.yml
num_zero_p.yml
numeric_methods.yml
object_allocate.yml
objspace_dump_all.yml
pm_array.yml
ractor_const.yml
ractor_float_to_s.yml
range_last.yml
README.md
realpath.yml
require.yml
require_thread.yml
securerandom.rb
so_ackermann.rb
so_array.rb
so_binary_trees.rb
so_concatenate.rb
so_count_words.yml
so_exception.rb
so_fannkuch.rb
so_fasta.rb
so_k_nucleotide.yml
so_lists.rb
so_mandelbrot.rb
so_matrix.rb
so_meteor_contest.rb
so_nbody.rb
so_nested_loop.rb
so_nsieve.rb
so_nsieve_bits.rb
so_object.rb
so_partial_sums.rb
so_pidigits.rb
so_random.rb
so_reverse_complement.yml
so_sieve.rb
so_spectralnorm.rb
string_capitalize.yml
string_casecmp.yml
string_casecmp_p.yml
string_downcase.yml
string_index.rb
string_scan_re.rb
string_scan_str.rb
string_slice.yml
string_split.yml
string_swapcase.yml
string_upcase.yml
time_strptime.yml
time_subsec.rb
vm_array.yml
vm_attr_ivar.yml
vm_attr_ivar_set.yml
vm_backtrace.rb
vm_bigarray.yml
vm_bighash.yml
vm_block.yml
vm_block_handler.yml
vm_blockparam.yml
vm_blockparam_call.yml
vm_blockparam_pass.yml
vm_blockparam_yield.yml
vm_case.yml
vm_case_classes.yml
vm_case_lit.yml
vm_clearmethodcache.rb
vm_const.yml
vm_cvar.yml
vm_defined_method.yml
vm_dstr.yml
vm_ensure.yml
vm_eval.yml
vm_fiber_allocate.yml
vm_fiber_count.yml
vm_fiber_reuse.yml
vm_fiber_reuse_gc.yml
vm_fiber_switch.yml
vm_float_simple.yml
vm_freezestring.yml
vm_gc.rb
vm_gc_old_full.rb
vm_gc_old_immediate.rb
vm_gc_old_lazy.rb
vm_gc_short_lived.yml
vm_gc_short_with_complex_long.yml
vm_gc_short_with_long.yml
vm_gc_short_with_symbol.yml
vm_gc_wb_ary.yml
vm_gc_wb_ary_promoted.yml
vm_gc_wb_obj.yml
vm_gc_wb_obj_promoted.yml
vm_iclass_super.yml
vm_ivar.yml
vm_ivar_init.yml
vm_ivar_set.yml
vm_ivar_set_subclass.yml
vm_length.yml
vm_lvar_init.yml
vm_lvar_set.yml
vm_method.yml
vm_method_missing.yml
vm_method_with_block.yml
vm_module_ann_const_set.yml
vm_module_const_set.yml
vm_mutex.yml
vm_neq.yml
vm_newlambda.yml
vm_not.yml
vm_poly_method.yml
vm_poly_method_ov.yml
vm_poly_same_method.yml
vm_poly_singleton.yml
vm_proc.yml
vm_raise1.yml
vm_raise2.yml
vm_regexp.yml
vm_rescue.yml
vm_send.yml
vm_send_cfunc.yml
vm_simplereturn.yml
vm_string_literal.yml
vm_struct_big_aref_hi.yml
vm_struct_big_aref_lo.yml
vm_struct_big_aset.yml
vm_struct_big_href_hi.yml
vm_struct_big_href_lo.yml
vm_struct_big_hset.yml
vm_struct_small_aref.yml
vm_struct_small_aset.yml
vm_struct_small_href.yml
vm_struct_small_hset.yml
vm_super.yml
vm_swap.yml
vm_symbol_block_pass.rb
vm_thread_alive_check.yml
vm_thread_close.rb
vm_thread_condvar1.rb
vm_thread_condvar2.rb
vm_thread_create_join.rb
vm_thread_mutex1.rb
vm_thread_mutex2.rb
vm_thread_mutex3.rb
vm_thread_pass.rb
vm_thread_pass_flood.rb
vm_thread_pipe.rb
vm_thread_queue.rb
vm_thread_sized_queue.rb
vm_thread_sized_queue2.rb
vm_thread_sized_queue3.rb
vm_thread_sized_queue4.rb
vm_thread_sleep.yml
vm_unif1.yml
vm_yield.yml
vm_zsuper.yml

ruby/benchmark

This directory has benchmark definitions to be run with benchmark_driver.gem.

Normal usage

Execute gem install benchmark_driver and run a command like:

# Run a benchmark script with the ruby in the $PATH
benchmark-driver benchmark/app_fib.rb

# Run benchmark scripts with multiple Ruby executables or options
benchmark-driver benchmark/*.rb -e /path/to/ruby -e '/path/to/ruby --jit'

# Or compare Ruby versions managed by rbenv
benchmark-driver benchmark/*.rb --rbenv '2.5.1;2.6.0-preview2 --jit'

# You can collect many metrics in many ways
benchmark-driver benchmark/*.rb --runner memory --output markdown

# Some are defined with YAML for complex setup or accurate measurement
benchmark-driver benchmark/*.yml

See also:

Usage: benchmark-driver [options] RUBY|YAML...
    -r, --runner TYPE                Specify runner type: ips, time, memory, once (default: ips)
    -o, --output TYPE                Specify output type: compare, simple, markdown, record (default: compare)
    -e, --executables EXECS          Ruby executables (e1::path1 arg1; e2::path2 arg2;...)
        --rbenv VERSIONS             Ruby executables in rbenv (x.x.x arg1;y.y.y arg2;...)
        --repeat-count NUM           Try benchmark NUM times and use the fastest result or the worst memory usage
        --repeat-result TYPE         Yield "best", "average" or "worst" result with --repeat-count (default: best)
        --bundler                    Install and use gems specified in Gemfile
        --filter REGEXP              Filter out benchmarks with given regexp
        --run-duration SECONDS       Warmup estimates loop_count to run for this duration (default: 3)
    -v, --verbose                    Verbose mode. Multiple -v options increase visibility (max: 2)

make benchmark

Using make benchmark, make update-benchmark-driver automatically downloads the supported version of benchmark_driver, and it runs benchmarks with the downloaded benchmark_driver.

# Run all benchmarks with the ruby in the $PATH and the built ruby
make benchmark

# Or compare with specific ruby binary
make benchmark COMPARE_RUBY="/path/to/ruby --jit"

# Run vm benchmarks
make benchmark ITEM=vm

# Run some limited benchmarks in ITEM-matched files
make benchmark ITEM=vm OPTS=--filter=block

# You can specify the benchmark by an exact filename instead of using the default argument:
# ARGS = $$(find $(srcdir)/benchmark -maxdepth 1 -name '*$(ITEM)*.yml' -o -name '*$(ITEM)*.rb')
make benchmark ARGS=benchmark/erb_render.yml

# You can specify any option via $OPTS
make benchmark OPTS="--help"

# With `make benchmark`, some special runner plugins are available:
#   -r peak, -r size, -r total, -r utime, -r stime, -r cutime, -r cstime
make benchmark ITEM=vm_bigarray OPTS="-r peak"