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# frozen_string_literal: true
module RubyVM::RJIT
# Return a Hash for \RJIT statistics. \--rjit-stats makes more information available.
def self.runtime_stats
stats = {}
# Insn exits
INSNS.each_value do |insn|
exits = C.rjit_insn_exits[insn.bin]
if exits > 0
stats[:"exit_#{insn.name}"] = exits
end
end
# Runtime stats
C.rb_rjit_runtime_counters.members.each do |member|
stats[member] = C.rb_rjit_counters.public_send(member)
end
stats[:vm_insns_count] = C.rb_vm_insns_count
# Other stats are calculated here
stats[:side_exit_count] = stats.select { |name, _count| name.start_with?('exit_') }.sum(&:last)
if stats[:vm_insns_count] > 0
retired_in_rjit = stats[:rjit_insns_count] - stats[:side_exit_count]
stats[:total_insns_count] = retired_in_rjit + stats[:vm_insns_count]
stats[:ratio_in_rjit] = 100.0 * retired_in_rjit / stats[:total_insns_count]
else
stats.delete(:vm_insns_count)
end
stats
end
# :nodoc: all
class << self
private
# --yjit-stats at_exit
def print_stats
stats = runtime_stats
$stderr.puts("***RJIT: Printing RJIT statistics on exit***")
print_counters(stats, prefix: 'send_', prompt: 'method call exit reasons')
print_counters(stats, prefix: 'invokeblock_', prompt: 'invokeblock exit reasons')
print_counters(stats, prefix: 'invokesuper_', prompt: 'invokesuper exit reasons')
print_counters(stats, prefix: 'getblockpp_', prompt: 'getblockparamproxy exit reasons')
print_counters(stats, prefix: 'getivar_', prompt: 'getinstancevariable exit reasons')
print_counters(stats, prefix: 'setivar_', prompt: 'setinstancevariable exit reasons')
print_counters(stats, prefix: 'optaref_', prompt: 'opt_aref exit reasons')
print_counters(stats, prefix: 'optgetconst_', prompt: 'opt_getconstant_path exit reasons')
print_counters(stats, prefix: 'expandarray_', prompt: 'expandarray exit reasons')
$stderr.puts "compiled_block_count: #{format_number(13, stats[:compiled_block_count])}"
$stderr.puts "side_exit_count: #{format_number(13, stats[:side_exit_count])}"
$stderr.puts "total_insns_count: #{format_number(13, stats[:total_insns_count])}" if stats.key?(:total_insns_count)
$stderr.puts "vm_insns_count: #{format_number(13, stats[:vm_insns_count])}" if stats.key?(:vm_insns_count)
$stderr.puts "rjit_insns_count: #{format_number(13, stats[:rjit_insns_count])}"
$stderr.puts "ratio_in_rjit: #{format('%12.1f', stats[:ratio_in_rjit])}%" if stats.key?(:ratio_in_rjit)
print_exit_counts(stats)
end
def print_counters(stats, prefix:, prompt:)
$stderr.puts("#{prompt}: ")
counters = stats.filter { |key, _| key.start_with?(prefix) }
counters.filter! { |_, value| value != 0 }
counters.transform_keys! { |key| key.to_s.delete_prefix(prefix) }
if counters.empty?
$stderr.puts(" (all relevant counters are zero)")
return
end
counters = counters.to_a
counters.sort_by! { |(_, counter_value)| counter_value }
longest_name_length = counters.max_by { |(name, _)| name.length }.first.length
total = counters.sum { |(_, counter_value)| counter_value }
counters.reverse_each do |(name, value)|
percentage = value.fdiv(total) * 100
$stderr.printf(" %*s %s (%4.1f%%)\n", longest_name_length, name, format_number(10, value), percentage)
end
end
def print_exit_counts(stats, how_many: 20, padding: 2)
exits = stats.filter_map { |name, count| [name.to_s.delete_prefix('exit_'), count] if name.start_with?('exit_') }.to_h
return if exits.empty?
top_exits = exits.sort_by { |_name, count| -count }.first(how_many).to_h
total_exits = exits.values.sum
$stderr.puts "Top-#{top_exits.size} most frequent exit ops (#{format("%.1f", 100.0 * top_exits.values.sum / total_exits)}% of exits):"
name_width = top_exits.map { |name, _count| name.length }.max + padding
count_width = top_exits.map { |_name, count| format_number(10, count).length }.max + padding
top_exits.each do |name, count|
ratio = 100.0 * count / total_exits
$stderr.puts "#{format("%#{name_width}s", name)}: #{format_number(count_width, count)} (#{format('%4.1f', ratio)}%)"
end
end
# Format large numbers with comma separators for readability
def format_number(pad, number)
integer, decimal = number.to_s.split('.')
d_groups = integer.chars.reverse.each_slice(3)
with_commas = d_groups.map(&:join).join(',').reverse
[with_commas, decimal].compact.join('.').rjust(pad, ' ')
end
# --yjit-trace-exits at_exit
def dump_trace_exits
filename = "#{Dir.pwd}/rjit_exit_locations.dump"
File.binwrite(filename, Marshal.dump(exit_traces))
$stderr.puts("RJIT exit locations dumped to:\n#{filename}")
end
# Convert rb_rjit_raw_samples and rb_rjit_line_samples into a StackProf format.
def exit_traces
results = C.rjit_exit_traces
raw_samples = results[:raw].dup
line_samples = results[:lines].dup
frames = results[:frames].dup
samples_count = 0
# Loop through the instructions and set the frame hash with the data.
# We use nonexistent.def for the file name, otherwise insns.def will be displayed
# and that information isn't useful in this context.
RubyVM::INSTRUCTION_NAMES.each_with_index do |name, frame_id|
frame_hash = { samples: 0, total_samples: 0, edges: {}, name: name, file: "nonexistent.def", line: nil, lines: {} }
results[:frames][frame_id] = frame_hash
frames[frame_id] = frame_hash
end
# Loop through the raw_samples and build the hashes for StackProf.
# The loop is based off an example in the StackProf documentation and therefore
# this functionality can only work with that library.
#
# Raw Samples:
# [ length, frame1, frame2, frameN, ..., instruction, count
#
# Line Samples
# [ length, line_1, line_2, line_n, ..., dummy value, count
i = 0
while i < raw_samples.length
stack_length = raw_samples[i] + 1
i += 1 # consume the stack length
prev_frame_id = nil
stack_length.times do |idx|
idx += i
frame_id = raw_samples[idx]
if prev_frame_id
prev_frame = frames[prev_frame_id]
prev_frame[:edges][frame_id] ||= 0
prev_frame[:edges][frame_id] += 1
end
frame_info = frames[frame_id]
frame_info[:total_samples] += 1
frame_info[:lines][line_samples[idx]] ||= [0, 0]
frame_info[:lines][line_samples[idx]][0] += 1
prev_frame_id = frame_id
end
i += stack_length # consume the stack
top_frame_id = prev_frame_id
top_frame_line = 1
sample_count = raw_samples[i]
frames[top_frame_id][:samples] += sample_count
frames[top_frame_id][:lines] ||= {}
frames[top_frame_id][:lines][top_frame_line] ||= [0, 0]
frames[top_frame_id][:lines][top_frame_line][1] += sample_count
samples_count += sample_count
i += 1
end
results[:samples] = samples_count
# Set missed_samples and gc_samples to 0 as their values
# don't matter to us in this context.
results[:missed_samples] = 0
results[:gc_samples] = 0
results
end
end
end
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