Module: Sigdump

Defined in:
lib/sigdump.rb

Constant Summary collapse

VERSION = 
"0.2.5"

Class Method Summary collapse

Class Method Details

.dump(path = ENV['SIGDUMP_PATH']) ⇒ Object 



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# File 'lib/sigdump.rb', line 13

def self.dump(path=ENV['SIGDUMP_PATH'])
  _open_dump_path(path) do |io|
    io.write "Sigdump at #{Time.now} process #{Process.pid} (#{$0})\n"
    dump_all_thread_backtrace(io)
    dump_gc_stat(io)
    dump_object_count(io)
    dump_gc_profiler_result(io)
  end
end

.dump_all_thread_backtrace(io) ⇒ Object 



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# File 'lib/sigdump.rb', line 23

def self.dump_all_thread_backtrace(io)
  use_java_bean = defined?(Thread.current.to_java.getNativeThread.getId)
  if use_java_bean
    begin
      bean = java.lang.management.ManagementFactory.getThreadMXBean
      java_stacktrace_map = Hash[bean.getThreadInfo(bean.getAllThreadIds, true, true).map {|t| [t.getThreadId, t.toString] }]
    rescue
      # security error may happen
    end
  end
  Thread.list.each do |thread|
    dump_backtrace(thread, io)
    if java_stacktrace_map
      io.write "    In Java " + java_stacktrace_map[thread.to_java.getNativeThread.getId]
      io.flush
    end
  end
  nil
end

.dump_backtrace(thread, io) ⇒ Object 



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# File 'lib/sigdump.rb', line 43

def self.dump_backtrace(thread, io)
  status = thread.status
  if status == nil
    status = "finished"
  elsif status == false
    status = "error"
  end

  io.write "  Thread #{thread} status=#{status} priority=#{thread.priority}\n"
  if thread.backtrace
    thread.backtrace.each {|bt|
      io.write "      #{bt}\n"
    }
  end

  io.flush
  nil
end

.dump_gc_profiler_result(io) ⇒ Object 



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# File 'lib/sigdump.rb', line 112

def self.dump_gc_profiler_result(io)
  return unless defined?(GC::Profiler) && GC::Profiler.enabled?

  io.write "  GC profiling result:\n"
  io.write "  Total garbage collection time: %f\n" % GC::Profiler.total_time
  io.write GC::Profiler.result
  GC::Profiler.clear

  io.flush
  nil
end

.dump_gc_stat(io) ⇒ Object 



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# File 'lib/sigdump.rb', line 101

def self.dump_gc_stat(io)
  io.write "  GC stat:\n"

  GC.stat.each do |key, val|
    io.write "      #{key}: #{val}\n"
  end

  io.flush
  nil
end

.dump_object_count(io) ⇒ Object 



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# File 'lib/sigdump.rb', line 62

def self.dump_object_count(io)
  if defined?(ObjectSpace.count_objects)
    # ObjectSpace doesn't work in JRuby

    io.write "  Built-in objects:\n"
    ObjectSpace.count_objects.sort_by {|k,v| -v }.each {|k,v|
      io.write "%10s: %s\n" % [_fn(v), k]
    }

    string_size = 0
    array_size = 0
    hash_size = 0
    cmap = Hash.new(0).compare_by_identity
    ObjectSpace.each_object {|o|
      c = o.class rescue nil
      cmap[c] += 1
      if c == String
        string_size += o.bytesize
      elsif c == Array
        array_size += o.size
      elsif c == Hash
        hash_size += o.size
      end
    }

    io.write "  All objects:\n"
    cmap.sort_by {|k,v| -v }.each {|k,v|
      io.write "%10s: %s\n" % [_fn(v), k]
    }

    io.write "  String #{_fn(string_size)} bytes\n"
    io.write "   Array #{_fn(array_size)} elements\n"
    io.write "    Hash #{_fn(hash_size)} pairs\n"

    io.flush
  end
  nil
end

.setup(signal = ENV['SIGDUMP_SIGNAL'] || 'SIGCONT', path = ENV['SIGDUMP_PATH']) ⇒ Object 



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# File 'lib/sigdump.rb', line 4

def self.setup(signal=ENV['SIGDUMP_SIGNAL'] || 'SIGCONT', path=ENV['SIGDUMP_PATH'])
  Kernel.trap(signal) do
    begin
      dump(path)
    rescue
    end
  end
end