forked from rubocop/rubocop
/
prof.rake
40 lines (35 loc) · 1.12 KB
/
prof.rake
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# frozen_string_literal: true
namespace :prof do
dump_path = 'tmp/stackprof.dump'
desc 'Run RuboCop on itself with profiling on'
task :run, [:path] do |_task, args|
path = args.fetch(:path, '.')
cmd = "bin/rubocop-profile #{path}"
system cmd
end
task :run_if_needed, [:path] do
Rake::Task[:run].run unless File.exist?(dump_path)
end
desc 'List the slowest cops'
task slow_cops: :run_if_needed do
method = 'RuboCop::Cop::Commissioner#trigger_responding_cops'
cmd = "stackprof #{dump_path} --text --method '#{method}'"
puts cmd
output = `#{cmd}`
_header, list, _code = *output
.lines
.grep_v(/RuboCop::Cop::Commissioner/) # ignore internal calls
.slice_when { |line| line.match?(/callees.*:|code:/) }
puts list.first(40)
end
desc 'Check a particular method by walking through the callstack'
task :walk, [:method] => :run_if_needed do |_task, args|
method = args.fetch(:method) do
warn 'usage: bundle exec rake walk[Class#method]'
exit!
end
cmd = "stackprof #{dump_path} --walk --method '#{method}'"
puts cmd
system cmd
end
end