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Bug #20167

open

Code execution isn't recorded in Ractor

Added by shia (Sangyong Sim) about 2 months ago. Updated about 2 months ago.

Status:
Open
Assignee:
-
Target version:
-
[ruby-core:116104]

Description

reproduction code

# frozen-string-literal: true

require "coverage"

Coverage.start

require_relative "./some_lib"
# # some_lib.rb
# class C
#   def hoge(i)
#     i
#   end
# end

r = Ractor.new do
  loop do
    v = Ractor.receive
    ret_v = C.new.hoge(v)

    Ractor.yield ret_v
  end
end

2.times do |i|
  r << i
  r.take
end

Coverage.result.each do |file, lines|
  if file.include?("some_ractor_lib")
    if lines == [1, 1, 2, nil, nil]
      puts "OK"
    else
      puts "expected: [1, 1, 2, nil, nil]"
      puts "actual: #{lines.inspect}"
    end
  end
end

Target ruby version

3.2.0+ affected


Related issues 1 (1 open0 closed)

Is duplicate of Ruby master - Bug #20158: Ractor affects Coverage resultsAssignedko1 (Koichi Sasada)Actions

Updated by mame (Yusuke Endoh) about 2 months ago

At this time, the coverage library should be able to only measure coverage for Ractor that invoked Coverage.start. (I have not tried but invoking Coverage.start in multiple Ractors may cause fatal problems.)

To improve this situation, probabily we need the following big modification.

  • Covearge.start registers hooks to all existing Ractors.
  • The hook measures coverage data per Ractor, not globally.
  • Coverage.result aggregates all coverage data from every Ractor.
Actions #2

Updated by jeremyevans0 (Jeremy Evans) about 2 months ago

  • Is duplicate of Bug #20158: Ractor affects Coverage results added
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