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Bug #22487 » repro.rb

watson1978 (Shizuo Fujita), 10/29/2026 08:56 AM

 
rss = ->(key) { File.read("/proc/self/status")[/^#{key}:\s+(\d+)/, 1].to_i / 1024 }
total_gib = Integer(ARGV[0] || 1)

GC.start
before = rss.("VmRSS")
gaps = []
since = 0
last = GC.count
(total_gib * 1024).times do
String.new(capacity: 1 << 20) << "x"
since += 1
next if GC.count == last

gaps << since
since = 0
last = GC.count
end

puts "#{RUBY_DESCRIPTION}"
puts "#{total_gib} GiB: #{gaps.size} GCs, peak RSS +#{rss.("VmHWM") - before} MiB"
puts "MiB allocated between GCs: #{gaps.inspect}"
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